Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecm

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / A25a-fxs Engine Control / Sfi System / Terminals Of Ecm

TERMINALS OF ECM

HINT:

The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A19-1 (BATT) - A19-10 (E1)	G - W-B	Auxiliary battery (for measuring auxiliary battery voltage and ECM memory)	Always	11 to 16 V
A19-2 (IGSW) - A19-10 (E1)	B - W-B	Power switch signal	Power switch on (IG)	11 to 14 V
A19-3 (VPMP) - A19-10 (E1)	L - W-B	Vent valve (built into canister pump module)	Power switch on (IG)	11 to 14 V
A19-5 (MPMP) - A19-10 (E1)	V - W-B	Leak detection pump (canister pump module)	Leak detection pump off	Below 3 V
A19-5 (MPMP) - A19-10 (E1)	V - W-B	Leak detection pump (canister pump module)	Leak detection pump on	11 to 14 V
A19-6 (FPC) - A19-10 (E1)	R - W-B	Fuel pump control	Engine stopped, power switch on (IG)	Below 1.5 V
A19-7 (CAN+) - A19-10 (E1)	P - W-B	CAN communication line	Engine stopped, power switch on (IG)	Pulse generation (See waveform 1)
A19-8 (CANH) - A19-10 (E1)	B - W-B	CAN communication line	Engine stopped, power switch on (IG)	Pulse generation (See waveform 1)
A19-9 (+B) - A19-10 (E1)	L - W-B	Power source of ECM Power source of throttle actuator	Power switch on (IG)	11 to 14 V
A19-10 (E1) - Body ground	W-B - -	Ground	Always	Below 1 Ω
A19-12 (CCV2) - A19-10 (E1)	BE - W-B	Fuel vapor containment valve assembly signal	Fuel vapor containment valve assembly on (open)	Below 1.0 V
A19-12 (CCV2) - A19-10 (E1)	BE - W-B	Fuel vapor containment valve assembly signal	Fuel vapor containment valve assembly off (closed)	11 to 14 V
A19-15 (MREL) - A19-10 (E1)	W - W-B	EFI-MAIN NO. 1 relay operation signal	Power switch on (IG)	Below 1.5 V
A19-16 (NEO) - A19-10 (E1)	B - W-B	Crankshaft revolution signal	Idling with warm engine	Pulse generation (See waveform 2)
A19-17 (CAN-) - A19-10 (E1)	W - W-B	CAN communication line	Engine stopped, power switch on (IG)	Pulse generation (See waveform 3)
A19-18 (CANL) - A19-10 (E1)	W - W-B	CAN communication line	Engine stopped, power switch on (IG)	Pulse generation (See waveform 3)
A19-24 (G2O) - A19-10 (E1)	W - W-B	Camshaft revolution signal	Idling with warm engine	Pulse generation (See waveform 4)
A19-31 (LIDO) - A19-10 (E1)	GR - W-B	Fuel lid courtesy switch signal	Fuel lid closed	Below 1.0 V
A19-31 (LIDO) - A19-10 (E1)	GR - W-B	Fuel lid courtesy switch signal	Fuel lid open	11 to 14 V
A19-32 (RFC) - A19-10 (E1)	LG - W-B	Cooling fan control signal	Power switch on (IG), A/C switch on (max cool)	Pulse generation (See waveform 5)
A19-34 (IREL) - A19-10 (E1)	P - W-B	D INJ relay operation signal	Power switch on (IG)	11 to 14 V
A19-35 (+B2) - A19-10 (E1)	L - W-B	Power source of ECM	Power switch on (IG)	11 to 14 V
A19-36 (E2) - Body ground	W-B - -	Ground	Always	Below 1 Ω
A19-38 (FUEL) - A19-10 (E1)	G - W-B	Fuel lid opener switch signal	Fuel lid opener switch pressed	Below 1.0 V
A19-38 (FUEL) - A19-10 (E1)	G - W-B	Fuel lid opener switch signal	Fuel lid opener switch not pressed	4.5 to 5.5 V
A19-45 (EC) - Body ground	W-B - -	Ground	Always	Below 1 Ω
A19-41 (LSTM) - A19-10 (E1)	B - W-B	Fuel lid operation signal for combination meter assembly	Multi-information display displaying "Close Fuel Lid"	Pulse generation (See waveform 6)
			Multi-information display displaying "Ready to Refuel"	Pulse generation (See waveform 7)
			Power switch on (IG)	11 to 14 V
A19-44 (FREL) - A19-10 (E1)	Y - W-B	Fuel lid lock with motor assembly operation signal	Fuel lid lock with motor assembly operating	Below 1.0 V
A19-44 (FREL) - A19-10 (E1)	Y - W-B	Fuel lid lock with motor assembly operation signal	Fuel lid lock with motor assembly not operating	11 to 14 V
A19-48 (VCPP) - A19-49 (EPPM)	B - LG	Power source for canister pressure sensor (specific voltage)	Power switch on (IG)	4.5 to 5.5 V
A19-50 (PPMP) - A19-49 (EPPM)	P - LG	Canister pressure sensor (built into canister pump module)	Power switch on (IG)	3.0 to 3.6 V
A19-53 (+BD1) - A19-10 (E1)	W - W-B	Power source of ECU (injector driver)	Power switch on (IG)	11 to 14 V
A19-54 (E1D1) - Body ground	W-B - -	Ground	Always	Below 1 Ω
A19-57 (VPTK) - A19-56 (EPTK)	L - G	Power source of fuel tank pressure sensor (specific voltage)	Engine stopped, power switch on (IG)	4.75 to 5.25 V
A19-55 (PTNK) - A19-56 (EPTK)	R - G	Fuel tank pressure sensor signal	Engine stopped, power switch on (IG)	0.27 to 4.73 V
C55-1 (M-) - A19-10 (E1)	L - W-B	Throttle actuator operation signal (negative signal)	Idling with warm engine	Pulse generation (See waveform 8)
C55-2 (M+) - A19-10 (E1)	B - W-B	Throttle actuator operation signal (positive terminal)	Idling with warm engine	Pulse generation (See waveform 9)
C55-3 (EGA+) - A19-10 (E1)	R - W-B	EGR valve assembly operation signal	Idling with warm engine	Pulse generation (See waveform 10)
C55-4 (EGA-) - A19-10 (E1)	L - W-B	EGR valve assembly operation signal	Idling with warm engine	Pulse generation (See waveform 10)
C55-5 (EGB-) - A19-10 (E1)	V - W-B	EGR valve assembly operation signal	Idling with warm engine	Pulse generation (See waveform 10)
C55-6 (EGB+) - A19-10 (E1)	GR - W-B	EGR valve assembly operation signal	Idling with warm engine	Pulse generation (See waveform 10)
C55-7 (HTHM) - A19-10 (E1)	LA-G - W-B	Thermostat heater (water inlet with thermostat sub-assembly) operation signal	Power switch on (IG)	11 to 14 V
C55-8 (HA1B) - A19-10 (E1)	R - W-B	Air fuel ratio sensor (sensor 2) heater operation signal	Power switch on (IG)	11 to 14 V
C55-8 (HA1B) - A19-10 (E1)	R - W-B	Air fuel ratio sensor (sensor 2) heater operation signal	Idling with cold engine	Pulse generation (See waveform 11)
C55-9 (HA1A) - A19-10 (E1)	L - W-B	Air fuel ratio sensor (sensor 1) heater operation signal	Power switch on (IG)	11 to 14 V
C55-9 (HA1A) - A19-10 (E1)	L - W-B	Air fuel ratio sensor (sensor 1) heater operation signal	Idling with cold engine	Pulse generation (See waveform 12)
C55-10 (#2D-) - A19-10 (E1)	G - W-B	Direct fuel injector assembly signal (No. 2 cylinder)	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 13)
C55-11 (#2D+) - A19-10 (E1)	L - W-B	Direct fuel injector assembly signal (No. 2 cylinder)	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 13)
C55-12 (#3D+) - A19-10 (E1)	W - W-B	Direct fuel injector assembly signal (No. 3 cylinder)	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 13)
C55-13 (#3D-) - A19-10 (E1)	R - W-B	Direct fuel injector assembly signal (No. 3 cylinder)	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 13)
C55-14 (#4D-) - A19-10 (E1)	V - W-B	Direct fuel injector assembly signal (No. 4 cylinder)	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 13)
C55-15 (#4D+) - A19-10 (E1)	P - W-B	Direct fuel injector assembly signal (No. 4 cylinder)	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 13)
C55-16 (#1D+) - A19-10 (E1)	W - W-B	Direct fuel injector assembly signal (No. 1 cylinder)	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 13)
C55-17 (#1D-) - A19-10 (E1)	BR - W-B	Direct fuel injector assembly signal (No. 1 cylinder)	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 13)
C55-18 (FP1-) - A19-10 (E1)	L - W-B	Fuel pump assembly (for high pressure side) signal	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 14)
C55-19 (FP1+) - A19-10 (E1)	G - W-B	Fuel pump assembly (for high pressure side) signal	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"	Pulse generation (See waveform 14)
C55-20 (VOP-) - A19-10 (E1)	P - W-B	Oil pressure control valve operation signal	Idling with warm engine	Pulse generation (See waveform 15)
C55-21 (VOP+) - A19-10 (E1)	G - W-B	Oil pressure control valve operation signal	Idling with warm engine	Pulse generation (See waveform 15)
C55-26 (OE1+) - C55-25 (OE1-)	LA-B - LA-W	Cam timing oil control solenoid assembly operation signal	Idling	Pulse generation (See waveform 16)
C55-28 (EDT1) - A19-10 (E1)	P - W-B	Cam timing control motor with EDU assembly signal	Idling with warm engine	Pulse generation (See waveform 17)
C55-42 (WSV1) - A19-10 (E1)	LA-W - W-B	Flow shutting valve operation signal	Power switch on (IG)	11 to 14 V
C55-46 (IGT4) - A19-10 (E1)	B - W-B	No. 4 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 18)
C55-47 (IGT3) - A19-10 (E1)	P - W-B	No. 3 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 18)
C55-48 (IGT2) - A19-10 (E1)	V - W-B	No. 2 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 18)
C55-49 (IGT1) - A19-10 (E1)	W - W-B	No. 1 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 18)
C55-50 (WPO) - A19-10 (E1)	LA-G - W-B	Water inlet housing with water pump sub-assembly signal	Idling with warm engine	Pulse generation (See waveform 19)
C55-51 (WPI) - A19-10 (E1)	LA-B - W-B	Water inlet housing with water pump sub-assembly signal	Idling with warm engine	Pulse generation (See waveform 20)
C55-66 (PRG) - A19-10 (E1)	P - W-B	Purge VSV operation signal	Power switch on (IG)	11 to 14 V
C55-66 (PRG) - A19-10 (E1)	P - W-B	Purge VSV operation signal	Idling with warm engine, under purge control	Pulse generation (See waveform 21)
C55-70 (EMR1) - A19-10 (E1)	LG - W-B	Cam timing control motor with EDU assembly signal	Idling with warm engine	Pulse generation (See waveform 22)
C55-71 (EMF1) - A19-10 (E1)	B - W-B	Cam timing control motor with EDU assembly signal	Idling with warm engine	Below 5.0 V
C55-72 (EMD1) - A19-10 (E1)	L - W-B	Cam timing control motor with EDU assembly signal	Idling with warm engine	Pulse generation (See waveform 23)
C55-73 (#40) - A19-10 (E1)	P - W-B	Port fuel injector assembly signal (No. 4 cylinder)	Idling with warm engine (Data List item "Injection Mode" displaying "Port")	Pulse generation (See waveform 24)
C55-74 (#30) - A19-10 (E1)	W - W-B	Port fuel injector assembly signal (No. 3 cylinder)	Idling with warm engine (Data List item "Injection Mode" displaying "Port")	Pulse generation (See waveform 24)
C55-75 (#20) - A19-10 (E1)	G - W-B	Port fuel injector assembly signal (No. 2 cylinder)	Idling with warm engine (Data List item "Injection Mode" displaying "Port")	Pulse generation (See waveform 24)
C55-76 (#10) - A19-10 (E1)	B - W-B	Port fuel injector assembly signal (No. 1 cylinder)	Idling with warm engine (Data List item "Injection Mode" displaying "Port")	Pulse generation (See waveform 24)
C55-78 (VCVG) - A19-10 (E1)	R - W-B	Power source of mass air flow meter sub-assembly (specific voltage)	Power switch on (IG)	4.8 to 5.2 V
C55-84 (VCPF) - A19-10 (E1)	LG - W-B	Power source of No. 2 fuel pressure sensor (for low pressure side) (specific voltage)	Power switch on (IG)	4.75 to 5.25 V
C55-87 (VTA2) - C55-110 (ETA)	V - G	Throttle position sensor signal (for sensor malfunction detection)	Engine stopped, power switch on (IG), accelerator pedal fully released	2.1 to 3.1 V
C55-88 (VCV1) - A19-10 (E1)	L - W-B	Power source of camshaft position sensor (for intake camshaft) (specific voltage)	Power switch on (IG)	4.5 to 5.5 V
C55-90 (VV1+) - C55-89 (VV1-)	B - LG	Camshaft position sensor (for intake camshaft) signal	Idling with warm engine	Pulse generation (See waveform 25)
C55-91 (EV1+) - C55-114 (EV1-)	V - G	Camshaft position sensor (for exhaust camshaft) signal	Idling with warm engine	Pulse generation (See waveform 25)
C55-93 (NE+) - C55-115 (NE-)	L - P	Crankshaft position sensor signal	Idling with warm engine	Pulse generation (See waveform 26)
C55-94 (A1A-) - A19-10 (E1)	G - W-B	Air fuel ratio sensor (sensor 1) signal	Power switch on (IG)	1.24 to 4.22 V
C55-95 (A1A+) - A19-10 (E1)	R - W-B	Air fuel ratio sensor (sensor 1) signal	Power switch on (IG)	1.46 to 4.22 V
C55-97 (PR) - C55-96 (EPR)	L - V	Fuel pressure sensor (for high pressure side) signal	Idling with warm engine	0.5 to 4.5 V
C55-98 (VCPR) - C55-96 (EPR)	LG - V	Power source of fuel pressure sensor (for high pressure side) (specific voltage)	Power switch on (IG)	4.75 to 5.25 V
C55-99 (VCPE) - C55-100 (EPEO)	R - G	Power source of engine oil pressure sensor (specific voltage)	Power switch on (IG)	4.5 to 5.5 V
C55-101 (VG) - C55-79 (E2G)	W - G	Mass air flow meter sub-assembly signal	Power switch on (IG)	Pulse generation (See waveform 27)
C55-102 (THA) - C55-79 (E2G)	V - G	Intake air temperature sensor (mass air flow meter sub-assembly) signal	Idling, intake air temperature 0 to 80°C (32 to 176°F)	0.5 to 3.4 V
C55-107 (PFL) - C55-61 (EPFL)	V - L	No. 2 fuel pressure sensor (for low pressure side) signal	Idling with warm engine	0.75 to 4.5 V
C55-108 (VTA1) - C55-110 (ETA)	P - G	Throttle position sensor signal (for engine control)	Engine stopped, power switch on (IG), accelerator pedal fully released	0.6 to 1.1 V
C55-109 (VCTA) - C55-110 (ETA)	R - G	Power source of throttle position sensor (specific voltage)	Engine stopped, power switch on (IG)	4.5 to 5.5 V
C55-111 (KNK1) - C55-112 (EKNK)	B - W	Knock control sensor signal	Engine speed maintained at 2500 rpm after warming up engine	Pulse generation (See waveform 28)
C55-113 (VCE1) - A19-10 (E1)	L - W-B	Power source of camshaft position sensor (for exhaust camshaft) (specific voltage)	Power switch on (IG)	4.5 to 5.5 V
C55-116 (VCNE) - A19-10 (E1)	V - W-B	Power source of crankshaft position sensor (specific voltage)	Power switch on (IG)	4.5 to 5.5 V
C55-117 (A1B-) - A19-10 (E1)	W - W-B	Air fuel ratio sensor (sensor 2) signal	Power switch on (IG)	1.17 to 4.49 V
C55-118 (A1B+) - A19-10 (E1)	B - W-B	Air fuel ratio sensor (sensor 2) signal	Power switch on (IG)	1.53 to 5.96 V
C55-120 (PIM) - C55-119 (EPIM)	P - G	Manifold absolute pressure sensor signal	Power switch on (IG)	3.0 to 4.5 V
C55-121 (VCPM) - C55-119 (EPIM)	B - G	Power source of manifold absolute pressure sensor (specific voltage)	Power switch on (IG)	4.75 to 5.25 V
C55-122 (PEO) - C55-100 (EPEO)	W - G	Oil pressure sensor signal	Idling with warm engine	0.5 to 4.5 V
C55-123 (THEO) - C55-104 (ETHE)	V - W	Engine oil temperature sensor signal	Power switch on (IG)	0.14 to 4.93 V
C55-125 (THW) - C55-124 (ETHW)	L - P	Engine coolant temperature sensor signal	Idling, engine coolant temperature 75 to 100°C (167 to 212°F)	0.2 to 1.0 V
C55-129 (THTW) - C55-130 (ETHT)	P - W	No. 2 engine coolant temperature sensor signal	Idling, engine coolant temperature 75 to 100°C (167 to 212°F)	0.2 to 1.0 V

WAVEFORM 1

CAN Communication Signal (Reference)

ECM Terminal Name

Between CANH and E1

Between CAN+ and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, power switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 2

Crankshaft Revolution Signal from ECM to Inverter with Converter Assembly

ECM Terminal Name	Between NEO and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 3

CAN Communication Signal (Reference)

ECM Terminal Name

Between CANL and E1

Between CAN- and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, power switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 4

Camshaft Revolution Signal from ECM to Inverter with Converter Assembly

ECM Terminal Name	Between G2O and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 5

Cooling Fan Control Signal

ECM Terminal Name	Between RFC and E1
Tester Range	1 V/DIV., 20 ms./DIV.
Condition	Power switch on (IG), A/C switch on (max cool)

HINT:

The duty ratio varies depending on the engine coolant temperature.

WAVEFORM 6

Fuel Lid Operation Signal for Combination Meter Assembly

ECM Terminal Name	Between LSTM and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Multi-information display displaying "Close Fuel Lid"

WAVEFORM 7

Fuel Lid Operation Signal for Combination Meter Assembly

ECM Terminal Name	Between LSTM and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Multi-information display displaying "Ready to Refuel"

WAVEFORM 8

Throttle Actuator Operation Signal (Negative Terminal)

ECM Terminal Name	Between M- and E1
Tester Range	5 V/DIV., 1 ms./DIV.
Condition	Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 9

Throttle Actuator Operation Signal (Positive Terminal)

ECM Terminal Name	Between M+ and E1
Tester Range	5 V/DIV., 1 ms./DIV.
Condition	Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 10

EGR Valve Assembly Operation Signal

ECM Terminal Name	CH1: Between EGA+ and E1 CH2: Between EGA- and E1
ECM Terminal Name	CH1: Between EGB+ and E1 CH2: Between EGB- and E1
Tester Range	5 V/DIV., 5 μs./DIV.
Condition	Idling with warm engine

HINT:

When the EGR valve assembly is operating, a waveform is produced at each terminal.

WAVEFORM 11

Air Fuel Ratio Sensor (Sensor 2) Heater Operation Signal

ECM Terminal Name	Between HA1B and E1
Tester Range	5 V/DIV., 10 ms./DIV.
Condition	Idling with cold engine

WAVEFORM 12

Air Fuel Ratio Sensor (Sensor 1) Heater Operation Signal

ECM Terminal Name	Between HA1A and E1
Tester Range	5 V/DIV., 10 ms./DIV.
Condition	Idling with cold engine

WAVEFORM 13

No. 1 (to No. 4) Direct Fuel Injector Assembly Signal

ECM Terminal Name	CH1: Between #1D+ and E1 CH2: Between #1D- and E1
	CH1: Between #2D+ and E1 CH2: Between #2D- and E1
	CH1: Between #3D+ and E1 CH2: Between #3D- and E1
	CH1: Between #4D+ and E1 CH2: Between #4D- and E1
Tester Range	50 V/DIV., 200 μs./DIV.
Condition	Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

WAVEFORM 14

Fuel Pump Assembly (for High Pressure Side) Signal

ECM Terminal Name

CH1: Between FP1+ and E1

CH2: Between FP1- and E1

Tester Range

20 V/DIV., 500 μs./DIV.

Condition

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

WAVEFORM 15

Oil Pressure Control Valve Operation Signal

ECM Terminal Name

CH1: Between VOP+ and E1

CH2: Between VOP- and E1

Tester Range

5 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

WAVEFORM 16

Cam Timing Oil Control Solenoid Assembly Operation Signal

ECM Terminal Name	Between OE1+ and OE1-
Tester Range	5 V/DIV., 1 ms./DIV.
Condition	Idling

WAVEFORM 17

Cam Timing Control Motor with EDU Assembly Signal (EDT Signal)

ECM Terminal Name	Between EDT1 and E1
Tester Range	1 V/DIV., 5 ms./DIV.
Condition	Idling with warm engine

WAVEFORM 18

Ignition Coil Assembly Signal (IGT Signal)

ECM Terminal Name	Between IGT (1 to 4) and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 19

Water Inlet Housing with Water Pump Sub-assembly Signal (from ECM to Water Inlet Housing with Water Pump Sub-assembly)

ECM Terminal Name	Between WPO and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The duty ratio varies depending on the water inlet housing with water pump sub-assembly speed.

WAVEFORM 20

Water Inlet Housing with Water Pump Sub-assembly Signal (from Water Inlet Housing with Water Pump Sub-assembly to ECM)

ECM Terminal Name	Between WPI and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the water inlet housing with water pump sub-assembly speed increases.

WAVEFORM 21

Purge VSV Operation Signal

ECM Terminal Name	Between PRG and E1
Tester Range	10 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine, under purge control

HINT:

If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

WAVEFORM 22

Cam Timing Control Motor with EDU Assembly Signal (EMR Signal)

ECM Terminal Name	Between EMR1 and E1
Tester Range	2 V/DIV., 5 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 23

Cam Timing Control Motor with EDU Assembly Signal (EMD Signal)

ECM Terminal Name	Between EMD1 and E1
Tester Range	2 V/DIV., 100 ms./DIV.
Condition	Idling with warm engine

WAVEFORM 24

No. 1 (to No. 4) Port Fuel Injector Assembly Signal

ECM Terminal Name	Between #10 (to #40) and E1
Tester Range	20 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine (Data List item "Injection Mode" displaying "Port")

HINT:

The wavelength becomes shorter as the engine speed increases.
When the port injection injectors are operating, Port is displayed for Injection Mode of the Data List.

WAVEFORM 25

Camshaft Position Sensor Signal

ECM Terminal Name

CH1: Between VV1+ and VV1-

CH2: Between EV1+ and EV1-

Tester Range

5 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 26

Crankshaft Position Sensor Signal

ECM Terminal Name	Between NE+ and NE-
Tester Range	2 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 27

Mass Air Flow Meter Sub-assembly Signal

ECM Terminal Name	Between VG and E2G
Tester Range	1 V/DIV., 100 μs./DIV.
Condition	Power switch on (IG)

WAVEFORM 28

Knock Control Sensor Signal

ECM Terminal Name	Between KNK1 and EKNK
Tester Range	1 V/DIV., 1 ms./DIV.
Condition	Engine speed maintained at 2500 rpm after warming up engine

HINT:

The wavelength becomes shorter as the engine speed increases.
The waveforms and amplitudes displayed differ slightly depending on the vehicle.

System Diagram

Lost Communication with Drive Motor Control Module "A" Missing Message (U011087)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Cylinder 1 Injector "B" Circuit Open (P21CF13,P21D013-P21D413)
DESCRIPTION The D-4S system has two injection systems. One is an in-cylinder direct injection system that directly injects pressurized fuel into the combustion chamber. The other is an intake port injection system. The ECM determines the percentage of direct injection and port injection necessary in ...

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecm

System Diagram

Lost Communication with Drive Motor Control Module "A" Missing Message (U011087)

See More:

Toyota Avalon (XX50) 2019-2022 Owners Manual

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