Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: System Too Lean Bank 1 (P017100,P017200,P017400,P017500,P117000,P117B00)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / 2gr-fks Engine Control / Sfi System / System Too Lean Bank 1 (P017100,P017200,P017400,P017500,P117000,P117B00)

DESCRIPTION

The fuel trim is related to the feedback compensation value, not to the basic injection duration. The fuel trim consists of both the short-term and long-term fuel trims.

The short-term fuel trim is fuel compensation that is used to constantly maintain the air fuel ratio at stoichiometric levels. The signal from the air fuel ratio sensor indicates whether the air fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air fuel ratio is rich and an increase in the fuel injection volume if lean.

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short-term fuel trim compensation.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P017100	System Too Lean Bank 1	With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the lean side (2 trip detection logic).	Intake system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Mass air flow meter sub-assembly Engine coolant temperature sensor Fuel pressure Fuel pressure sensor (for high pressure side) Gas leak from exhaust system Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) PCV valve and hose PCV hose connections Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P0171
P017200	System Too Rich Bank 1	With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the rich side (2 trip detection logic).	Intake system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Mass air flow meter sub-assembly Engine coolant temperature sensor Ignition system Fuel pressure Fuel pressure sensor (for high pressure side) Gas leak from exhaust system Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P0172
P017400	System Too Lean Bank 2	With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the lean side (2 trip detection logic).	Intake system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Mass air flow meter sub-assembly Engine coolant temperature sensor Fuel pressure Fuel pressure sensor (for high pressure side) Gas leak from exhaust system Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) PCV valve and hose PCV hose connections Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P0174
P017500	System Too Rich Bank 2	With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the rich side (2 trip detection logic).	Intake system Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Mass air flow meter sub-assembly Engine coolant temperature sensor Ignition system Fuel pressure Fuel pressure sensor (for high pressure side) Gas leak from exhaust system Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P0175
P117000	Fuel Performance/Port Injector	Although a DTC is stored for a rich or lean condition, the amount of fuel trim during direct injection is normal (1 trip detection logic)	Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure ECM	Does not come on	DTC stored	SAE Code: P1170
P117B00	Fuel Performance/Direct Injector	Although a DTC is stored for a rich or lean condition, the amount of fuel trim during port injection is normal (1 trip detection logic)	Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel pressure ECM	Does not come on	DTC stored	SAE Code: P117B

HINT:

When DTC P017100 or P017400 is stored, the actual air fuel ratio is on the lean side. When DTC P017200 or P017500 is stored, the actual air fuel ratio is on the rich side.
If the vehicle runs out of fuel, the air fuel ratio is lean and DTC P017100 or P017400 may be stored. The MIL is then illuminated.
When DTC P117000 or P117B00 is output , it may not be possible to precisely determine whether the port injection or the direct injection is malfunctioning, depending on the conditions. In this case, perform an Active Test (Control the Injection Mode) to determine which injection system is malfunctioning.

MONITOR DESCRIPTION

Under closed loop fuel control, fuel injection volumes that deviate from those estimated by the ECM cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. Deviations from the fuel injection volumes estimated by the ECM also affect the average fuel trim learned value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learned value of the air fuel ratio). If the average fuel trim learned value exceeds the malfunction thresholds, the ECM interprets this as a fault in the fuel system and stores a DTC.

Example:

The average fuel trim learned value is +35% or higher, or -35% or less, the ECM interprets this as a fuel system malfunction.

MONITOR STRATEGY

Related DTCs	P0171: Fuel trim lean (bank 1) P0172: Fuel trim rich (bank 1) P0174: Fuel trim lean (bank 2) P0175: Fuel trim rich (bank 2) P1170: Fuel trim (port injection fail) P117B: Fuel trim (direct injection fail)
Required Sensors/Components (Main)	Fuel system
Required Sensors/Components (Related)	Air fuel ratio sensor Mass air flow meter sub-assembly Crankshaft position sensor
Frequency of Operation	Continuous
Duration	Within 10 seconds
MIL Operation	2 driving cycles: P0171, P0172, P0174, P0175 Immediate: P1170, P117B
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	P0010, P0020 (VVT oil control solenoid bank 1, 2) P0011, P0021 (VVT system bank 1, 2 - advance) P0012, P0022 (VVT system bank 1, 2 - retard) P0013, P0023 (Exhaust VVT oil control solenoid bank 1, 2) P0014, P0024 (Exhaust VVT system bank 1, 2 - advance) P0015, P0025 (Exhaust VVT system bank 1, 2 - retard) P0016, P0018 (VVT system bank 1, 2 - misalignment) P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment) P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater) P0191, P0192, P0193 (Fuel pressure sensor (for high pressure side)) P0101, P0102, P0103 (Mass air flow meter) P0117, P0118 (Engine coolant temperature sensor) P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor) P0125 (Insufficient coolant temperature for closed loop fuel control) P0201, P0202, P0203, P0204, P0205, P0206, P062D, P21CF, P21D0, P21D1, P21D2, P21D3, P21D4 (Fuel injector) P0335, P0337, P0338 (Crankshaft position sensor) P0340, P0342, P0343, P0345, P0347, P0348 (Camshaft position sensor) P0351 - P0356 (Igniter) P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust camshaft position sensor) P0500 (Vehicle speed sensor) P107B, P107C, P107D (Fuel pressure sensor (for low pressure side)) P11EA, P11EB, P11EC, P11ED, P11EE, P11EF, P11F0, P11F1, P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1 (Air-fuel ratio imbalance)
Fuel system status	Closed loop
Battery voltage	11 V or higher
Either of the following conditions is met	1 or 2
1. Engine speed	Less than 650 rpm
2. Engine load	12% or higher
Catalyst monitor	Not executed

TYPICAL MALFUNCTION THRESHOLDS

P0171, P0172, P0174 and P0175: Fuel-Trim Lean/Rich

EVAP purge-cut	Executing
Either of the following conditions is met	1 or 2
1. Average between short-term fuel trim and long-term fuel trim	35% or higher (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim	-35% or less (varies with engine coolant temperature)

P1170: Fuel Trim (Port Injection Fail)

DTCs of fuel system have already been set	-
EVAP purge-cut	Executing
Direct injection	100%
Both of the following conditions are met	1 and 2
1. Average between short-term fuel trim and long-term fuel trim	Less than 35% (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim	Higher than -35% (varies with engine coolant temperature)

P117B: Fuel Trim (Direct Injection Fail)

DTCs of fuel system have already been set	-
EVAP purge-cut	Executing
Port injection	100%
Both of the following conditions are met	1 and 2
1. Average between short-term fuel trim and long-term fuel trim	Less than 35% (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim	Higher than -35% (varies with engine coolant temperature)

CONFIRMATION DRIVING PATTERN

HINT:

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
Permanent misfire and fuel system DTCs can only be cleared when performing the universal trip driving pattern when no malfunction is detected.

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) [A].
Turn the Techstream on.
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off [B].
With the engine warmed up, idle the engine for 2 minutes or more [C].
Drive the vehicle at a speed between 60 and 100 km/h (37 and 62 mph) for 5 minutes or more [D].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
HINT:

If a pending DTC is output, the system is malfunctioning.

WIRING DIAGRAM

Refer to DTC P010012 for the mass air flow meter sub-assembly circuit.
Click here
Refer to DTC P219519 for the air fuel ratio sensor circuit.
Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transaxle.
Bank 2 refers to the bank that does not include the No. 1 cylinder.
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P017100, P017200, P017400, P017500, P117000 OR P117B00)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTC P017100, P017200, P017400, P017500, P117000 or P117B00 is output	A
DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 and other DTCs are output	B

HINT:

If any DTCs other than P017100, P017200, P017400, P017500, P117000 or P117B00 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION MODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Data List / Coolant Temperature, Injection Mode, Short FT B1S1, Long FT B1S1, Short FT B2S1 and Long FT B2S1.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Mode

Data List Display
Coolant Temperature
Injection Mode
Short FT B1S1
Short FT B2S1
Long FT B1S1
Long FT B2S1

(f) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Port.

OK:

Techstream Display	Specified Condition
Total of Short FT B1S1 (B2S1) and Long FT B1S1 (B2S1)	Between -19 and 19%

(g) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

OK:

Techstream Display	Specified Condition
Total of Short FT B1S1 (B2S1) and Long FT B1S1 (B2S1)	Between -19 and 19%

Item		Proceed to
Port	Direct	Proceed to
OK	OK	A
OK	NG	B
NG	OK	C
NG	NG	D

GO TO STEP 4

GO TO STEP 11

GO TO STEP 12

3.	CHECK IF VEHICLE HAS RUN OUT OF FUEL IN PAST

(a) Has the vehicle run out of fuel in the past?

YES

DTC CAUSED BY RUNNING OUT OF FUEL

CHECK FOR INTERMITTENT PROBLEMS

4.	READ VALUE USING TECHSTREAM (FUEL PRESSURE (HIGH))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Coolant Temperature, Fuel Pressure (High) and Injection Mode.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Coolant Temperature
Fuel Pressure (High)
Injection Mode

(e) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

(f) According to the display on the Techstream, read the Data List.

Standard:

Techstream Display	Condition	Specified Condition
Fuel Pressure (High)	Shift position: P A/C: Off Engine warmed up Engine Speed: 3000 rpm Injection Mode: Direct	2400 to 20000 kPag

GO TO STEP 7

5.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION MODE (DIRECT))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Data List / Coolant Temperature, High Pressure Fuel Pump Duty Ratio (D4), Injection Mode, Short FT B1S1, Long FT B1S1, Short FT B2S1 and Long FT B2S1.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Mode

Data List Display
Coolant Temperature
High Pressure Fuel Pump Duty Ratio (D4)
Injection Mode
Short FT B1S1
Short FT B2S1
Long FT B1S1
Long FT B2S1

(f) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

HINT:

The A/C switch and all accessory switches should be off, and the shift lever should be in the P position, and the engine should be fully warmed up.

Item				Proceed to
Injection Mode	High Pressure Fuel Pump Duty Ratio (D4)	Short FT B1S1 + Long FT B1S1	Short FT B2S1 + Long FT B2S1	Proceed to
Direct	10% to 40%	-	-	A
	40% or higher	-20% or less	-20% or less	B
	10% or less	20% or higher	20% or higher	B
	40% or higher	20% or higher	20% or higher	C
	10% or less	-20% or less	-20% or less	D

HINT:

Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

Click here

REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY LH (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE))

GO TO STEP 8

REPLACE ECM

6.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION MODE (DIRECT))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Mode

Data List Display
Coolant Temperature
High Pressure Fuel Pump Duty Ratio (D4)
Injection Mode
Short FT B1S1
Short FT B2S1
Long FT B1S1
Long FT B2S1

(f) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

HINT:

The A/C switch and all accessory switches should be off, and the shift lever should be in the P position, and the engine should be fully warmed up.

Item				Proceed to
Injection Mode	High Pressure Fuel Pump Duty Ratio (D4)	Short FT B1S1 + Long FT B1S1	Short FT B2S1 + Long FT B2S1	Proceed to
Direct	10% to 40%	-25% or less	-25% or less	A
	10% to 40%	30% or higher	30% or higher	A
	10% to 40%	-25% or less	-25% to 25%	B
	10% to 40%	25% or higher	-25% to 25%	B
	10% to 40%	-25% to 25%	-25% or less	C
	10% to 40%	-25% to 25%	25% or higher	C
	10% to 40%	-25% to 25%	-25% to 25%	D

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

Click here

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (ALL CYLINDERS))

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (BANK 1))

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (BANK 2))

CHECK FOR INTERMITTENT PROBLEMS

7.	CHECK MISFIRE COUNT OF DIRECT INJECTION

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Mode / Data List / Coolant Temperature, Injection Mode and Misfire Count Cylinder #1 to Misfire Count Cylinder #6.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Mode

Data List Display
Coolant Temperature
Injection Mode
Misfire Count Cylinder #1
Misfire Count Cylinder #2
Misfire Count Cylinder #3
Misfire Count Cylinder #4
Misfire Count Cylinder #5
Misfire Count Cylinder #6

(f) According to the display on the Techstream, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

HINT:

The A/C switch and all accessory switches should be off, and the shift lever should be in the P position, and the engine should be fully warmed up.

Injection Mode	Misfire Count	Proceed to
Direct	No misfire counts, or misfire counts occur randomly in all cylinders	A
Direct	Misfire counts occur in particular cylinder	B

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

Click here

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION)

8.	REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)

(a) Replace the fuel pump assembly (for high pressure side).

Click here

HINT:

Perform "Inspection After Repair" after replacing the fuel pump assembly (for high pressure side).

Click here

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

10.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (DTC P017100, P017200, P017400, P017500, P117000 OR P117B00)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 are output	B

END

REPLACE ECM

11.	INSPECT FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)

(a) Check the injection volume (whether fuel volume is high or low, and whether injection pattern is poor).

Click here

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

Click here

REPLACE ECM

REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)

12.	CHECK PCV HOSE CONNECTIONS

(a) Check the PCV hose connections.

Click here

OK:

PCV valve and hose are connected correctly and are not damaged.

REPAIR OR REPLACE PCV HOSE

13.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks in intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

REPAIR OR REPLACE INTAKE SYSTEM

14.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

(e) Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds.

(f) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / Coolant Temperature, A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2 or A/F (O2) Sensor Voltage B2S1 and O2 Sensor Voltage B2S2.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
Coolant Temperature
A/F (O2) Sensor Voltage B1S1
A/F (O2) Sensor Voltage B2S1
O2 Sensor Voltage B1S2
O2 Sensor Voltage B2S2

(g) Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.

(h) Monitor the voltage outputs of the air fuel ratio sensor and the heated oxygen sensor (A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2 or A/F (O2) Sensor Voltage B2S1 and O2 Sensor Voltage B2S2) displayed on the Techstream.

HINT:

The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Standard:

Techstream Display (Sensor)	Injection Volume	Status	Voltage
A/F (O2) Sensor Voltage B1S1 A/F (O2) Sensor Voltage B2S1 (Air fuel ratio)	12.5%	Rich	Below 3.1 V
	-12.5%	Lean	Higher than 3.4 V
O2 Sensor Voltage B1S2 O2 Sensor Voltage B2S2 (Heated oxygen)	12.5%	Rich	Higher than 0.55 V
	-12.5%	Lean	Below 0.4 V

Status of A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1	Status of O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Suspected Trouble Area	Proceed to
Lean/Rich	Lean/Rich	Normal	-	A
Lean	Lean	Actual air fuel ratio lean	PCV valve and hose PCV hose connections Gas leak from exhaust system Intake system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor
Rich	Rich	Actual air fuel ratio rich	Gas leak from exhaust system Ignition system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor
Lean	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B
Rich	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B

Lean: During Control the Injection Volume for A/F Sensor of the Active Test, the air fuel ratio sensor output voltage (A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2) is consistently below 0.4 V.
Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1 is consistently below 3.1 V, and the O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2 is consistently higher than 0.55 V.
Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the air fuel ratio sensor or heated oxygen sensor alternates correctly.

HINT:

Refer to "Data List / Active Test" [A/F (O2) Sensor Voltage B1S1, O2 Sensor Voltage B1S2, A/F (O2) Sensor Voltage B2S1 or O2 Sensor Voltage B2S2].

Click here

GO TO STEP 22

15.	READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

(e) Read the Data List twice, when the engine is both cold and warmed up.

Standard:

Techstream Display	Condition	Specified Condition
Coolant Temperature	Cold engine	Same as ambient air temperature
Coolant Temperature	Warm engine	Between 75 and 100°C (167 and 212°F)

HINT:

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

Click here

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

16.	READ VALUE USING TECHSTREAM (MASS AIR FLOW SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(d) Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor
Coolant Temperature

(e) Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.

(f) Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

Standard:

Techstream Display

Condition

Specified Condition

Mass Air Flow Sensor

Engine warmed up

Shift position: P

A/C: Off

Engine Speed: 3000 rpm

Between 10.6 and 15.8 gm/sec

GO TO STEP 29

17.	CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)

(a) Check the fuel pressure (for low pressure side).

Click here

GO TO STEP 21

18.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

REPAIR OR REPLACE EXHAUST SYSTEM

19.	INSPECT SPARK PLUG

(a) Inspect the spark plug.

Click here

HINT:

Perform "Inspection After Repair" after replacing the spark plug.

Click here

REPLACE SPARK PLUG

20.	CHECK FOR SPARK (SPARK TEST)

(a) Perform a spark test.

Click here

HINT:

If the result of the spark test is normal, proceed to the next step.
Perform "Inspection After Repair" after replacing the spark plug or ignition coil assembly.
Click here

GO TO STEP 29

21.	CHECK FUEL LINE

(a) Check the fuel lines for leaks or blockage.

GO TO FUEL PUMP CONTROL CIRCUIT

REPAIR OR REPLACE FUEL SYSTEM

22.	INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

(a) Inspect the air fuel ratio sensor.

Click here

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click here

REPLACE AIR FUEL RATIO SENSOR

23.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

Front view of wire harness connector

(to Air Fuel Ratio Sensor)

Bank 1

Bank 2

(a) Disconnect the air fuel ratio sensor connector.

(b) Turn the engine switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
C47-2 (+B) - Body ground	Engine switch on (IG)	11 to 14 V
C48-2 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

GO TO STEP 32

24.	CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C47-1 (HA1A) - C56-52 (HA1A)	Always	Below 1 Ω
C47-3 (A1A+) - C56-125 (A1A+)	Always	Below 1 Ω
C47-4 (A1A-) - C56-126 (A1A-)	Always	Below 1 Ω
C48-1 (HA2A) - C56-17 (HA2A)	Always	Below 1 Ω
C48-3 (A2A+) - C56-123 (A2A+)	Always	Below 1 Ω
C48-4 (A2A-) - C56-124 (A2A-)	Always	Below 1 Ω
C47-1 (HA1A) or C56-52 (HA1A) - Body ground and other terminals	Always	10 kΩ or higher
C47-3 (A1A+) or C56-125 (A1A+) - Body ground and other terminals	Always	10 kΩ or higher
C47-4 (A1A-) or C56-126 (A1A-) - Body ground and other terminals	Always	10 kΩ or higher
C48-1 (HA2A) or C56-17 (HA2A) - Body ground and other terminals	Always	10 kΩ or higher
C48-3 (A2A+) or C56-123 (A2A+) - Body ground and other terminals	Always	10 kΩ or higher
C48-4 (A2A-) or C56-124 (A2A-) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

25.	REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor.

Click here

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click here

26.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

27.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 are output	B

END

28.	READ VALUE USING TECHSTREAM (MASS AIR FLOW SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(d) Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor
Coolant Temperature

(e) Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.

(f) Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

Standard:

Techstream Display

Condition

Specified Condition

Mass Air Flow Sensor

Engine warmed up

Shift position: P

A/C: Off

Engine Speed: 3000 rpm

Between 10.6 and 15.8 gm/sec

29.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

Click here

HINT:

Repair any problems.

30.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

31.	CHECK WHETHER DTC OUTPUT RECURS (DTC P017100, P017200, P017400, P017500, P117000 OR P117B00)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 are output	B

END

GO TO STEP 36

32.	INSPECT EFI-MAIN NO. 3 RELAY

(a) Inspect the EFI-MAIN NO. 3 relay.

Click here

REPLACE EFI-MAIN NO. 3 RELAY

33.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 3 RELAY)

*1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
*2	EFI-MAIN NO. 3 Relay

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
3 (EFI-MAIN NO. 3 relay) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 3 RELAY)

34.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND)

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (EFI-MAIN NO. 3 relay) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

35.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - AIR FUEL RATIO SENSOR)

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the air fuel ratio sensor connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
5 (EFI-MAIN NO. 3 relay) - C47-2 (+B)	Always	Below 1 Ω
5 (EFI-MAIN NO. 3 relay) - C48-2 (+B)	Always	Below 1 Ω
5 (EFI-MAIN NO. 3 relay) or C47-2 (+B) - Body ground and other terminals	Always	10 kΩ or higher
5 (EFI-MAIN NO. 3 relay) or C48-2 (+B) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

36.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C28-3 (5V) - C56-90 (VC)	Always	Below 1 Ω
C28-1 (FG) - C56-116 (VG)	Always	Below 1 Ω
C28-2 (E2G) - C56-115 (E2G)	Always	Below 1 Ω
C28-3 (5V) or C56-90 (VC) - Body ground and other terminals	Always	10 kΩ or higher
C28-1 (FG) or C56-116 (VG) - Body ground and other terminals	Always	10 kΩ or higher
C28-2 (E2G) or C56-115 (E2G) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

37.	REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

(a) Replace the mass air flow meter sub-assembly.

Click here

HINT:

If the result of the inspection performed in steps 16 and 28 (READ VALUE USING TECHSTREAM (MASS AIR FLOW SENSOR)) indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
Click here

38.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

39.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC P017100, P017200, P017400, P017500, P117000 and/or P117B00 are output	B

END

REPLACE ECM

O2 Sensor Circuit Bank 1 Sensor 2 Circuit Short to Ground (P013611,...,P015623)

Fuel Rail Pressure Sensor "A" Circuit Short to Ground (P019011)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Front Seat Inner Belt Assembly: Installation
INSTALLATION CAUTION / NOTICE / HINT PROCEDURE 1. INSTALL FRONT SEAT INNER BELT ASSEMBLY LH (for Driver Side) (a) Install the front seat belt anchor plate as shown in the illustration. Install in this Direction (b) Install the front seat inner belt assembly LH with the nut. Protruding Part Torque: 4 ...

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: System Too Lean Bank 1 (P017100,P017200,P017400,P017500,P117000,P117B00)

O2 Sensor Circuit Bank 1 Sensor 2 Circuit Short to Ground (P013611,...,P015623)

Fuel Rail Pressure Sensor "A" Circuit Short to Ground (P019011)

See More:

Toyota Avalon (XX50) 2019-2022 Owners Manual

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual