Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

The following 5 items are important points for problem analysis:

What	Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Driving conditions, weather conditions
How did it happen?	Problem symptoms

PRE-CHECK

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

(d) Check the vehicle specifications.

4.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Using the Techstream, check for CAN communication system DTCs.

Click here

Result	Proceed to
CAN DTCs are not output	A
CAN DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

5.	PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table	A
Fault is listed in Problem Symptoms Table	B

GO TO STEP 7

6.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Operation Check

Click here

(b) Terminals of ECU

Click here

(d) On-vehicle Inspection

7.	REPAIR OR REPLACE

8.	CONFIRMATION TEST

END

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Current Above Threshold (P227019,P227118)
DESCRIPTION Refer to DTC P003612. Click here HINT: Although the DTC title say O2 sensor, these DTCs relate to the air fuel ratio sensor (sensor 2). DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note P227019 A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Cur ...

Toyota Avalon (XX50) 2019-2022 Owners Manual