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

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / 2gr-fks 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
A18-1 (BATT) - C56-53 (E1)	R - W-B	Battery (for measuring battery voltage and for ECM memory)	Always	11 to 14 V
A18-2 (+B) - C56-53 (E1)	L - W-B	Power source of ECM	Engine switch on (IG)	11 to 14 V
A18-3 (+B2) - C56-53 (E1)	L - W-B	Power source of ECM	Engine switch on (IG)	11 to 14 V
A18-4 (IGSW) - C56-53 (E1)	B - W-B	Engine switch signal	Engine switch on (IG)	11 to 14 V
A18-7 (IREL) - C56-53 (E1)	P - W-B	D INJ relay operation signal	Engine stopped, engine switch on (IG)	0 to 1.5 V
A18-8 (+BM) - C56-53 (E1)	G - W-B	Power source of throttle actuator	Always	11 to 14 V
A18-13 (CANH) - C56-53 (E1)	B - W-B	CAN communication line	Engine stopped, engine switch on (IG)	Pulse generation (See waveform 1)
A18-14 (EC) - Body ground	W-B - -	Ground	Always	Below 1 Ω
A18-17 (S) - C56-53 (E1)	GR - W-B	S shift position switch signal	Engine switch on (IG) and shift lever in S	11 to 14 V
A18-17 (S) - C56-53 (E1)	GR - W-B	S shift position switch signal	Engine switch on (IG) and shift lever not in S	Below 1 V
A18-18 (FPC) - C56-53 (E1)	R - W-B	Fuel pump control	Engine stopped, engine switch on (IG)	Below 1.5 V
A18-19 (VPMP) - C56-53 (E1)	L - W-B	Vent valve (built into canister pump module)	Engine switch on (IG)	11 to 14 V
A18-21 (MPMP) - C56-53 (E1)	V - W-B	Leak detection pump (built into canister pump module)	Leak detection pump OFF	Below 3 V
A18-21 (MPMP) - C56-53 (E1)	V - W-B	Leak detection pump (built into canister pump module)	Leak detection pump ON	11 to 14 V
A18-26 (CANL) - C56-53 (E1)	W - W-B	CAN communication line	Engine stopped, engine switch on (IG)	Pulse generation (See waveform 2)
A18-27 (STP) - C56-53 (E1)	SB - W-B	Stop light switch assembly signal	Brake pedal depressed	7.5 to 14 V
A18-27 (STP) - C56-53 (E1)	SB - W-B	Stop light switch assembly signal	Brake pedal released	Below 1.5 V
A18-30 (NEO) - C56-53 (E1)	B - W-B	Engine speed signal sent to other ECUs	Idling with warm engine	Pulse generation (See waveform 3)
A18-33 (TC) - C56-53 (E1)	GR - W-B	Terminal TC of DLC3	Engine stopped, engine switch on (IG)	11 to 14 V
A18-35 (VCPP) - A18-34 (EPPM)	B - LG	Power source for canister pressure sensor (specific voltage)	Engine switch on (IG)	4.5 to 5.5 V
A18-36 (PPMP) - A18-34 (EPPM)	P - LG	Canister pressure sensor (built into canister pump module)	Engine switch on (IG)	3.0 to 3.6 V
A18-39 (SPD) - C56-53 (E1)	L - W-B	Vehicle speed signal from combination meter assembly	Driving at 20 km/h (12 mph)	Pulse generation (See waveform 4)
A18-40 (SPCN) - C56-53 (E1)	V - W-B	Drive mode switch (NORMAL mode)	Engine switch on (IG)	11 to 14 V
A18-40 (SPCN) - C56-53 (E1)	V - W-B	Drive mode switch (NORMAL mode)	Engine switch on (IG), NORMAL mode switch being pushed and held (NORMAL mode)	0 to 1.5 V
A18-42 (ST1-) - C56-53 (E1)	LG - W-B	Stop light switch assembly signal (opposite to STP terminal)	Engine switch on (IG), brake pedal depressed	0 to 1.5 V
A18-42 (ST1-) - C56-53 (E1)	LG - W-B		Engine switch on (IG), brake pedal released	7.5 to 14 V
A18-43 (STA) - C56-53 (E1)	G - W-B	Starter assembly signal	Cranking	6.0 V or higher
A18-46 (MREL) - C56-53 (E1)	W - W-B	EFI MAIN relay operation signal	Engine switch on (IG)	11 to 14 V
A18-47 (VPA) - A18-48 (EPA)	G - L	Accelerator pedal position sensor signal (for engine control)	Engine switch on (IG), accelerator pedal fully released	0.5 to 1.1 V
A18-47 (VPA) - A18-48 (EPA)	G - L		Engine switch on (IG), accelerator pedal fully depressed	2.6 to 4.5 V
A18-49 (VCPA) - A18-48 (EPA)	BE - L	Power source of accelerator pedal position sensor (for VPA)	Engine stopped, engine switch on (IG)	4.5 to 5.5 V
A18-50 (VPA2) - A18-51 (EPA2)	GR - P	Accelerator pedal position sensor signal	Engine switch on (IG), accelerator pedal fully released	1.2 to 2.0 V
A18-50 (VPA2) - A18-51 (EPA2)	GR - P	Accelerator pedal position sensor signal	Engine switch on (IG), accelerator pedal fully depressed	3.4 to 4.75 V
A18-52 (VCP2) - A18-51 (EPA2)	SB - P	Power source of accelerator pedal position sensor (for VPA2)	Engine stopped, engine switch on (IG)	4.5 to 5.5 V
A18-55 (PWMS) - C56-53 (E1)	LG - W-B	Drive mode switch (SPORT mode)	Engine switch on (IG)	11 to 14 V
A18-55 (PWMS) - C56-53 (E1)	LG - W-B	Drive mode switch (SPORT mode)	Engine switch on (IG), SPORT mode switch being pushed and held at SPORT position (SPORT mode)	0 to 1.5 V
A18-58 (KSW) - C56-53 (E1)	R - W-B	Key in vehicle signal	Engine switch off → on (IG)	0 to 3.0 V
C56-2 (OE2+) - C56-3 (OE2-)	R - W	Cam timing oil control solenoid assembly (for exhaust camshaft of bank 2) operation signal	Idling	Pulse generation (See waveform 5)
C56-4 (OE1+) - C56-5 (OE1-)	G - R	Cam timing oil control solenoid assembly (for exhaust camshaft of bank 1) operation signal	Idling	Pulse generation (See waveform 5)
C56-9 (OC2+) - C56-8 (OC2-)	B - L	Cam timing oil control solenoid assembly (for intake camshaft of bank 2) operation signal	Idling	Pulse generation (See waveform 6)
C56-16 (HT2B) - C56-53 (E1)	L - W-B	Heated oxygen sensor (bank 2 sensor 2) heater operation signal	Idling	Below 3.0 V
C56-16 (HT2B) - C56-53 (E1)	L - W-B		Engine switch on (IG)	11 to 14 V
C56-17 (HA2A) - C56-46 (E05)	R - W-B	Air fuel ratio sensor (bank 2 sensor 1) heater operation signal	Idling	Pulse generation (See waveform 7)
C56-17 (HA2A) - C56-46 (E05)	R - W-B		Engine switch on (IG)	11 to 14 V
C56-18 (+BD2) - C56-53 (E1)	L - W-B	Power source of ECM (injector driver)	Engine stopped, engine switch on (IG)	11 to 14 V
C56-19 (+BD1) - C56-53 (E1)	L-R - W-B	Power source of ECM (injector driver)	Engine stopped, engine switch on (IG)	11 to 14 V
C56-20 (E02) - Body ground	W-B - -	Ground	Always	Below 1 Ω
C56-21 (E04) - Body ground	W-B - -	Ground	Always	Below 1 Ω
C56-23 (FP1+) - C56-22 (FP1-)	Y - L	Fuel pump assembly (for high pressure side) signal	Idling with warm engine	Pulse generation
C56-24 (#6D+) - C56-54 (#6D-)	L - Y	No. 6 fuel injector assembly (for direct injection) signal	Idling with warm engine, Data List item "Injection Mode" displays "Direct"	Pulse generation
C56-25 (#3D+) - C56-26 (#3D-)	V - P	No. 3 fuel injector assembly (for direct injection) signal	Idling with warm engine, Data List item "Injection Mode" displays "Direct"	Pulse generation
C56-27 (#5D+) - C56-57 (#5D-)	L - Y	No. 5 fuel injector assembly (for direct injection) signal	Idling with warm engine, Data List item "Injection Mode" displays "Direct"	Pulse generation
C56-28 (#2D+) - C56-58 (#2D-)	G - BR	No. 2 fuel injector assembly (for direct injection) signal	Idling with warm engine, Data List item "Injection Mode" displays "Direct"	Pulse generation
C56-29 (#4D+) - C56-59 (#4D-)	V - P	No. 4 fuel injector assembly (for direct injection) signal	Idling with warm engine, Data List item "Injection Mode" displays "Direct"	Pulse generation
C56-30 (#1D+) - C56-60 (#1D-)	B - W	No. 1 fuel injector assembly (for direct injection) signal	Idling with warm engine, Data List item "Injection Mode" displays "Direct"	Pulse generation
C56-34 (IGT6) - C56-53 (E1)	V - W-B	No. 6 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 8)
C56-35 (IGT4) - C56-53 (E1)	B - W-B	No. 4 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 8)
C56-36 (IGT2) - C56-53 (E1)	GR - W-B	No. 2 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 8)
C56-38 (OC1+) - C56-68 (OC1-)	W - G	Cam timing oil control solenoid assembly (for intake camshaft of bank 1) operation signal	Idling	Pulse generation (See waveform 6)
C56-39 (ACM) - C56-53 (E1)	GR - W-B	Vacuum switching valve (for active control engine mount system) operation signal	Engine switch on (IG)	11 to 14 V
C56-40 (#60) - C56-51 (E01)	G - W-B	No. 6 fuel injector assembly (for port injection) signal	Engine switch on (IG)	0 to 5 V
C56-40 (#60) - C56-51 (E01)	G - W-B	No. 6 fuel injector assembly (for port injection) signal	Idling with warm engine, Data List item "Injection Mode" displaying "Port"	Pulse generation (See waveform 9)
C56-41 (#30) - C56-51 (E01)	B - W-B	No. 3 fuel injector assembly (for port injection) signal	Engine switch on (IG)	0 to 5 V
C56-41 (#30) - C56-51 (E01)	B - W-B	No. 3 fuel injector assembly (for port injection) signal	Idling with warm engine, Data List item "Injection Mode" displaying "Port"	Pulse generation (See waveform 9)
C56-42 (#50) - C56-51 (E01)	R - W-B	No. 5 fuel injector assembly (for port injection) signal	Engine switch on (IG)	0 to 5 V
C56-42 (#50) - C56-51 (E01)	R - W-B	No. 5 fuel injector assembly (for port injection) signal	Idling with warm engine, Data List item "Injection Mode" displaying "Port"	Pulse generation (See waveform 9)
C56-43 (#20) - C56-51 (E01)	BE - W-B	No. 2 fuel injector assembly (for port injection) signal	Engine switch on (IG)	0 to 5 V
C56-43 (#20) - C56-51 (E01)	BE - W-B	No. 2 fuel injector assembly (for port injection) signal	Idling with warm engine, Data List item "Injection Mode" displaying "Port"	Pulse generation (See waveform 9)
C56-44 (#40) - C56-51 (E01)	W - W-B	No. 4 fuel injector assembly (for port injection) signal	Engine switch on (IG)	0 to 5 V
C56-44 (#40) - C56-51 (E01)	W - W-B	No. 4 fuel injector assembly (for port injection) signal	Idling with warm engine, Data List item "Injection Mode" displaying "Port"	Pulse generation (See waveform 9)
C56-45 (#10) - C56-51 (E01)	GR - W-B	No. 1 fuel injector assembly (for port injection) signal	Engine switch on (IG)	0 to 5 V
C56-45 (#10) - C56-51 (E01)	GR - W-B	No. 1 fuel injector assembly (for port injection) signal	Idling with warm engine, Data List item "Injection Mode" displaying "Port"	Pulse generation (See waveform 9)
C56-46 (E05) - Body ground	W-B - -	Ground	Always	Below 1 Ω
C56-47 (M-) - C56-49 (ME01)	P - W-B	Throttle actuator operation signal (negative signal)	Idling with warm engine	Pulse generation (See waveform 10)
C56-48 (M+) - C56-49 (ME01)	V - W-B	Throttle actuator operation signal (positive terminal)	Idling with warm engine	Pulse generation (See waveform 11)
C56-49 (ME01) - Body ground	W-B - -	Ground	Always	Below 1 Ω
C56-50 (HT1B) - C56-53 (E1)	L - W-B	Heated oxygen sensor (bank 1 sensor 2) heater operation signal	Idling	Below 3.0 V
C56-50 (HT1B) - C56-53 (E1)	L - W-B		Engine switch on (IG)	11 to 14 V
C56-51 (E01) - Body ground	W-B - -	Ground	Always	Below 1 Ω
C56-52 (HA1A) - C56-21 (E04)	B - W-B	Air fuel ratio sensor (bank 1 sensor 1) heater operation signal	Idling	Pulse generation (See waveform 7)
C56-52 (HA1A) - C56-21 (E04)	B - W-B		Engine switch on (IG)	11 to 14 V
C56-53 (E1) - Body ground	W-B - -	Ground	Always	Below 1 Ω
C56-55 (E1D2) - Body ground	B - -	Ground	Always	Below 1 Ω
C56-56 (E1D1) - Body ground	W - -	Ground	Always	Below 1 Ω
C56-64 (PTCR) - C56-53 (E1)	L - W-B	Thermostat heater operation signal	Engine switch on (IG)	11 to 14 V
C56-65 (PRG) - C56-53 (E1)	R - W-B	Purge VSV operation signal	Engine switch on (IG)	11 to 14 V
C56-65 (PRG) - C56-53 (E1)	R - W-B	Purge VSV operation signal	Idling	Pulse generation (See waveform 12)
C56-66 (ACIS) - C56-53 (E1)	L - W-B	No. 1 vacuum switching valve (for intake air control valve sub-assembly) operation signal	Engine switch on (IG)	11 to 14 V
C56-69 (IGT5) - C56-53 (E1)	R - W-B	No. 5 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 8)
C56-70 (IGT3) - C56-53 (E1)	L - W-B	No. 3 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 8)
C56-71 (IGT1) - C56-53 (E1)	GR - W-B	No. 1 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 8)
C56-80 (IGF2) - C56-53 (E1)	LG - W-B	Ignition coil assembly (ignition confirmation signal)	Engine switch on (IG)	4.5 to 5.5 V
C56-80 (IGF2) - C56-53 (E1)	LG - W-B	Ignition coil assembly (ignition confirmation signal)	Idling with warm engine	Pulse generation (See waveform 8)
C56-82 (KNK1) - C56-81 (EKNK)	B - W	Knock control sensor (bank 1) signal	Engine speed maintained at 4000 rpm after warming up engine	Pulse generation (See waveform 13)
C56-87 (PR) - C56-133 (ETHW)	P - BR	Fuel pressure sensor (for high pressure side) signal	Idling with warm engine	0.5 to 4.5 V
C56-89 (VTA2) - C56-120 (ETA)	LG - B	Throttle position sensor signal (for sensor malfunction detection)	Engine switch on (IG), accelerator pedal fully released	2.1 to 3.1 V
C56-89 (VTA2) - C56-120 (ETA)	LG - B		Accelerator pedal fully depressed (engine running)	4.6 to 5.0 V
C56-90 (VC) - C56-53 (E1)	W - W-B	Power source for sensor (specific voltage)	Engine switch on (IG)	4.5 to 5.5 V
C56-91 (OX2B) - C56-92 (EX2B)	G - W	Heated oxygen sensor (bank 2 sensor 2) signal	Engine speed maintained at 2500 rpm for 2 minutes after warming up engine	Pulse generation (See waveform 14)
C56-93 (OX1B) - C56-94 (EX1B)	R - G	Heated oxygen sensor (bank 1 sensor 2) signal	Engine speed maintained at 2500 rpm for 2 minutes after warming up engine	Pulse generation (See waveform 14)
C56-96 (VCNE) - C56-53 (E1)	R - W-B	Power source of crankshaft position sensor (specific voltage)	Engine switch on (IG)	4.5 to 5.5 V
C56-98 (VCV2) - C56-97 (VV2-)	R - B	Power source of VVT sensor (bank 2) (specific voltage)	Engine switch on (IG)	4.5 to 5.5 V
C56-99 (VCV1) - C56-100 (VV1-)	W - R	Power source of VVT sensor (bank 1) (specific voltage)	Engine switch on (IG)	4.5 to 5.5 V
C56-101 (THW) - C56-133 (ETHW)	B - BR	Engine coolant temperature sensor	Idling, engine coolant temperature 75 to 100°C (167 to 212°F)	0.2 to 1.0 V
C56-102 (THA) - C56-115 (E2G)	L - LG	Intake air temperature sensor	Idling, intake air temperature 0 to 80°C (32 to 176°F)	0.5 to 3.4 V
C56-106 (NSW) - C56-53 (E1)	R - W-B	Park/Neutral position switch assembly signal	Engine switch on (IG), shift lever not in P or N	11 to 14 V
C56-106 (NSW) - C56-53 (E1)	R - W-B	Park/Neutral position switch assembly signal	Engine switch on (IG), shift lever in P or N	Below 1 V
C56-107 (R) - C56-53 (E1)	W - W-B	R shift position switch signal	Engine switch on (IG), shift lever in R	11 to 14 V
C56-107 (R) - C56-53 (E1)	W - W-B	R shift position switch signal	Engine switch on (IG), shift lever not in R	Below 1 V
C56-108 (P) - C56-53 (E1)	B - W-B	P shift position switch signal	Engine switch on (IG), shift lever in P	11 to 14 V
C56-108 (P) - C56-53 (E1)	B - W-B	P shift position switch signal	Engine switch on (IG), shift lever not in P	Below 1 V
C56-112 (IGF1) - C56-53 (E1)	B - W-B	Ignition coil assembly (ignition confirmation signal)	Engine switch on (IG)	4.5 to 5.5 V
C56-112 (IGF1) - C56-53 (E1)	B - W-B	Ignition coil assembly (ignition confirmation signal)	Idling with warm engine	Pulse generation (See waveform 8)
C56-114 (KNK2) - C56-113 (EKN2)	R - G	Knock control sensor (bank 2) signal	Engine speed maintained at 4000 rpm after warming up engine	Pulse generation (See waveform 13)
C56-116 (VG) - C56-115 (E2G)	R - LG	Mass air flow meter sub-assembly signal	Engine switch on (IG)	Pulse generation (See waveform 15)
C56-121 (VCTA) - C56-120 (ETA)	R - B	Power source of throttle position sensor (specific voltage)	Engine stopped, engine switch on (IG)	4.5 to 5.5 V
C56-122 (VTA1) - C56-120 (ETA)	G - B	Throttle position sensor signal (for engine control)	Engine switch on (IG), accelerator pedal fully released	0.6 to 1.1 V
C56-122 (VTA1) - C56-120 (ETA)	G - B	Throttle position sensor signal (for engine control)	Accelerator pedal fully depressed (engine running)	3.2 to 4.8 V
C56-123 (A2A+) - C56-53 (E1)	P - W-B	Air fuel ratio sensor (bank 2 sensor 1) signal	Engine switch on (IG)	3.3 V*
C56-124 (A2A-) - C56-53 (E1)	L - W-B	Air fuel ratio sensor (bank 2 sensor 1) signal	Engine switch on (IG)	2.9 V*
C56-125 (A1A+) - C56-53 (E1)	Y - W-B	Air fuel ratio sensor (bank 1 sensor 1) signal	Engine switch on (IG)	3.3 V*
C56-126 (A1A-) - C56-53 (E1)	BR - W-B	Air fuel ratio sensor (bank 1 sensor 1) signal	Engine switch on (IG)	2.9 V*
C56-127 (GE01) - Body ground	BR - -	Shielded earth (ground) circuit of throttle actuator	Always	Below 1 Ω
C56-128 (NE+) - C56-95 (NE-)	L - B	Crankshaft position sensor	Idling with warm engine	Pulse generation (See waveform 16)
C56-129 (VV2+) - C56-97 (VV2-)	G - B	VVT sensor (for intake camshaft of bank 2) signal	Idling	Pulse generation (See waveform 17)
C56-130 (EV2+) - C56-97 (VV2-)	GR - B	VVT sensor (for exhaust camshaft of bank 2) signal	Idling	Pulse generation (See waveform 18)
C56-131 (EV1+) - C56-100 (VV1-)	B - R	VVT sensor (for exhaust camshaft of bank 1) signal	Idling	Pulse generation (See waveform 18)
C56-132 (VV1+) - C56-100 (VV1-)	G - R	VVT sensor (for intake camshaft of bank 1) signal	Idling	Pulse generation (See waveform 17)
C56-134 (PFL) - C56-133 (ETHW)	R - BR	Fuel pressure sensor (for low pressure side) signal	Idling with warm engine	0.75 to 4.5 V
C56-136 (RFC) - C56-53 (E1)	LG - W-B	Cooling fan control signal	Engine switch on (IG), A/C switch on (max cool)	Pulse generation (See waveform 19)
C56-139 (D) - C56-53 (E1)	R - W-B	D shift position switch signal	Engine switch on (IG) and shift lever in D or S	11 to 14 V
C56-139 (D) - C56-53 (E1)	R - W-B	D shift position switch signal	Engine switch on (IG) and shift lever not in D or S	Below 1 V
C56-140 (N) - C56-53 (E1)	LG - W-B	N shift position switch signal	Engine switch on (IG), shift lever in N	11 to 14 V
C56-140 (N) - C56-53 (E1)	LG - W-B	N shift position switch signal	Engine switch on (IG), shift lever not in N	Below 1 V

*: The ECM terminal voltage is constant regardless of the voltage output from the sensor.

WAVEFORM 1

CAN Communication Signal (Reference)

ECM Terminal Name	Between CANH and E1
Tester Range	1 V/DIV., 10 μs./DIV.
Condition	Engine stopped, engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 2

CAN Communication Signal (Reference)

ECM Terminal Name	Between CANL and E1
Tester Range	1 V/DIV., 10 μs./DIV.
Condition	Engine stopped, engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 3

Engine Speed Signal

ECM Terminal Name	Between NEO and E1
Tester Range	1 V/DIV., 2 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 4

Vehicle Speed Signal

ECM Terminal Name	Between SPD and E1
Tester Range	2 V/DIV., 20 ms./DIV.
Condition	Driving at 20 km/h (12 mph)

HINT:

The wavelength becomes shorter as the vehicle speed increases.

WAVEFORM 5

Cam Timing Oil Control Solenoid Assembly (for Exhaust Camshaft) Signal

ECM Terminal Name

Between OE1+ and OE1-

Between OE2+ and OE2-

Tester Range

5 V/DIV., 1 ms./DIV.

Condition

Idling

WAVEFORM 6

Cam Timing Oil Control Solenoid Assembly (for Intake Camshaft) Signal

ECM Terminal Name

Between OC1+ and OC1-

Between OC2+ and OC2-

Tester Range

5 V/DIV., 1 ms./DIV.

Condition

Idling

WAVEFORM 7

Air Fuel Ratio Sensor Heater Operation Signal

ECM Terminal Name

Between HA1A and E04

Between HA2A and E05

Tester Range

5 V/DIV., 10 ms./DIV.

Condition

Idling

WAVEFORM 8

Ignition Coil Assembly Signal (IGT and IGF Signal)

ECM Terminal Name

CH1: Between IGT (1 to 6) and E1

CH2: Between IGF (1 or 2) and E1

Tester Range

2 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

WAVEFORM 9

No. 1 (to No. 6) Fuel Injector Assembly (for Port Injection) Signal

ECM Terminal Name	Between #10 (to #60) and E01
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 Way of the Data List.

WAVEFORM 10

Throttle Actuator Negative Terminal Signal

ECM Terminal Name	Between M- and ME01
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 11

Throttle Actuator Positive Terminal Signal

ECM Terminal Name	Between M+ and ME01
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 12

Purge VSV Operation Signal

ECM Terminal Name	Between PRG and E1
Tester Range	10 V/DIV., 20 ms./DIV.
Condition	Idling

HINT:

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

WAVEFORM 13

Knock Control Sensor Signal

ECM Terminal Name

Between KNK1 and EKNK

Between KNK2 and EKN2

Tester Range

1 V/DIV., 1 ms./DIV.

Condition

Engine speed maintained at 4000 rpm after warming up engine

HINT:

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

WAVEFORM 14

Heated Oxygen Sensor Signal

ECM Terminal Name

Between OX1B and EX1B

Between OX2B and EX2B

Tester Range

0.2 V/DIV., 200 ms./DIV.

Condition

Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

HINT:

Data List, item "O2 Sensor Voltage B1S2" and "O2 Sensor Voltage B2S2" shows the ECM values from the heated oxygen sensor.

WAVEFORM 15

Mass Air Flow Meter Sub-assembly Signal

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

WAVEFORM 16

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 17

VVT Sensor (for Intake Camshaft) Signal

ECM Terminal Name

CH1: Between VV1+ and VV1-

CH2: Between VV2+ and VV2-

Tester Range

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

Condition

Idling

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 18

VVT Sensor (for Exhaust Camshaft) Signal

ECM Terminal Name

CH1: Between EV1+ and VV1-

CH2: Between EV2+ and VV2-

Tester Range

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

Condition

Idling

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 19

Cooling Fan Control Signal

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

HINT:

The duty ratio varies depending on the engine coolant temperature.

System Diagram

Lost Communication with TCM Missing Message (U010187)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: System Voltage Circuit Short to Ground or Open (P056014)
MONITOR DESCRIPTION The battery supplies electricity to the ECM even when the engine switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls below a minimum level, the memory is cleared and the ECM determines th ...

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

System Diagram

Lost Communication with TCM Missing Message (U010187)

See More:

Toyota Avalon (XX50) 2019-2022 Owners Manual

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