Terminals Of ECM

HINT:

The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals is also indicated.

The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the STD Voltage column.

The illustration above can be used as a reference to identify the ECM terminal locations.

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	STD Voltage
BATT (E8-3) - E1 (E6-1)	L - W-B	Battery (for measuring the battery voltage and for the ECM memory)	Always	9 to 14 V
+BM (E8-7) - E1 (E6-1)	GR - W-B	Power source of throttle motor	Always	9 to 14 V
IGSW (E8-9) - E1 (E6-1)	B-O - W-B	Ignition switch	Ignition switch ON	9 to 14 V
+B (E8-1) - E1 (E6-1)	B - W-B	Power source of ECM	Ignition switch ON	9 to 14 V
+B2 (E8-2) - E1 (E6-1)	B - W-B	Power source of ECM	Ignition switch ON	9 to 14 V
MREL (E8-8) - E1 (E6-1)	W-G - W-B	EFI relay	Ignition switch ON	9 to 14 V
VC (E4-23) - E2 (E4-28)	L-R - BR	Power source for sensor (specific voltage)	Ignition switch ON	4.5 to 5.5 V
VG (E4-30) - E2G (E4-29)	W-R - B-W	Mass air flow meter	Idling, shift lever position P or N, A/C switch OFF	0.5 to 3.0 V
THA (E4-22) - E2 (E4-28)	Y-B - BR	Intake air temperature sensor	Idling, Intake air temperature 20°C (68°F)	0.5 to 3.4 V
THW (E4-21) - E2 (E4-28)	R-L - BR	Engine coolant temperature sensor	Idling, Engine coolant temperature 80°C (176°F)	0.2 to 1.0 V
VTA1 (E4-20) - E2 (E4-28)	Y - BR	Throttle position sensor (for engine control)	Ignition switch ON, throttle valve fully closed	0.5 to 1.2 V
VTA1 (E4-20) - E2 (E4-28)	Y - BR	Throttle position sensor (for engine control)	Ignition switch ON, throttle valve fully open	3.2 to 4.8 V
VTA2 (E4-19) - E2 (E4-28)	R-B - BR	Throttle position sensor (for sensor malfunction detection)	Ignition switch ON, throttle valve fully closed	2.1 to 3.1 V
VTA2 (E4-19) - E2 (E4-28)	R-B - BR	Throttle position sensor (for sensor malfunction detection)	Ignition switch ON, throttle valve fully open	4.5 to 5.5 V
VPA (E8-18) - EPA (E8-20)	W-R - LG-B	Accelerator pedal position sensor (for engine control)	Ignition switch ON, throttle valve fully closed	0.5 to 1.1 V
VPA (E8-18) - EPA (E8-20)	W-R - LG-B	Accelerator pedal position sensor (for engine control)	Ignition switch ON, throttle valve fully open	2.6 to 4.5 V
VPA2 (E8-19) - EPA2 (E8-21)	R-B - V-W	Accelerator pedal position sensor (for sensor malfunction detection)	Ignition switch ON, throttle valve fully closed	1.2 to 2.0 V
OC1+ (E6-17) - OC1- (E6-16)	P - LG	Camshaft timing oil control valve (OCV)	Idling	Pulse generation (See waveform 3)
OC2+ (E6-15) - OC2- (E6-14)	R-W - Y-R	Camshaft timing oil control valve (OCV)	Idling	Pulse generation (See waveform 3)
VV1+ (E6-25) - VV1- (E6-24)	Y(1) - L(1)	Variable valve timing (VVT) sensor (Bank 1)	Idling	Pulse generation (See waveform 4)
VV2+ (E6-18) - VV2- (E6-28)	R(1) - G(1)	Variable valve timing (VVT) sensor (Bank 2)	Idling	Pulse generation (See waveform 4)
M+ (E4-5) - E1 (E6-1)	R(1) - W-B	Throttle motor	Idling	Pulse generation (See waveform 7)
M- (E4-4) - E1 (E6-1)	G(1) - W-B	Throttle motor	Idling	Pulse generation (See waveform 8)
A1A+ (E5-22) - E1 (E6-1)	Y(1) - W-B	A/F sensor	Ignition switch ON
A1A- (E5-30) - E1 (E6-1)	BR(1) - W-B	A/F sensor	Ignition switch ON
A2A+ (E5-23) - E1 (E6-1)	P(1) - W-B	A/F sensor	Ignition switch ON
A2A- (E5-31) - E1 (E6-1)	L(1) - W-B	A/F sensor	Ignition switch ON
HA1A (E5-2) - E1 (E6-1)	R-L - W-B	A/F sensor heater	Idling
HA2A (E5-1) - E1 (E6-1)	B-W - W-B	A/F sensor heater	Ignition switch ON
VPA2 (E8-19) - EPA2 (E8-21)	R-B - V-W	Accelerator pedal position sensor (for sensor malfunction detection)	Ignition switch ON, throttle valve fully open	3.4 to 5.3 V
VCPA (E8-26) - EPA (E8-20)	B-Y - LG-B	Power source of accelerator pedal position sensor (for VPA)	Ignition switch ON	4.5 to 5.5 V
VCP2 (E8-27) - EPA2 (E8-21)	W-L - V-W	Power source of accelerator pedal position sensor (for VPA2)	Ignition switch ON	4.5 to 5.5 V
OX1B (E4-18) - E1 (E6-1)	B(1) - W-B	Heated oxygen sensor	Maintain engine speed at 2 500 rpm for 2 minutes after warming up	Pulse generation (See waveform 10)
OX2B (E4-33) - E1 (E6-1)	W(1) - W-B
HT1B (E4-1) - E1 (E6-1)	G-Y - W-B	Heated oxygen sensor heater	Idling	Below 3 0 V
HT1B (E5-5) - E1 (E6-1)	P - W-B
HT1B (E4-1) - E1 (E6-1)	G-Y - W-B	Heated oxygen sensor heater	Ignition switch ON	9 to 14 V
HT1B (E5-5) - E1 (E6-1)	P - W-B
#10 (E6-2) - E01 (E4-7)	R-L - W-B	Injector	Ignition switch ON	9 to 14 V
#20 (E6-3) - E01 (E4-7)	L - W-B
#30 (E6-4) - E01 (E4-7)	W - W-B
#40 (E6-5) - E01 (E4-7)	Y - W-B
#50 (E6-6) - E01 (E4-7)	G - W-B
#60 (E6-7) - E01 (E4-7)	R - W-B
#70 (E4-3) - E01 (E4-7)	W - W-B
#80 (E4-2) - E01 (E4-7)	BR - W-B
#10 (E6-2) - E01 (E4-7)	R-L - W-B	Injector	Idling	Pulse generation (See waveform 1)
#20 (E6-3) - E01 (E4-7)	L - W-B
#30 (E6-4) - E01 (E4-7)	W - W-B
#40 (E6-5) - E01 (E4-7)	Y - W-B
#50 (E6-6) - E01 (E4-7)	G - W-B
#60 (E6-7) - E01 (E4-7)	R - W-B
#70 (E4-3) - E01 (E4-7)	W - W-B
#80 (E4-2) - E01 (E4-7)	BR - W-B
KNK1 (E5-29) - EKNK (E5-28)	G(1) - R(1)	Knock sensor	Maintain engine speed at 4,000 rpm after warming up	Pulse generation (See waveform 2)
KNK2 (E5-21) - EKN2 (E5-20)	W(1) - B(1)	Knock sensor	Maintain engine speed at 4,000 rpm after warming up	Pulse generation (See waveform 2)
G2+ (E6-19) - G2- (E6-29)	B - W	Camshaft position sensor	Idling	Pulse generation (See waveform 5)
NE+ (E6-21) - NE- (E6-20)	L(1) - Y(1)	Crankshaft position sensor	Idling	Pulse generation (See waveform 5)
PRG (E4-34) - E1 (E6-1)	Y-R - W-B	VSV for EVAP	Ignition switch ON	9 to 14 V
SPD (E7-8) - E1 (E6-1)	V-R - W-B	Speed signal from combination meter	Ignition switch ON, Rotate driving wheel slowly	Pulse generation (See waveform 6)
FPR (E6-30) - E1 (E6-1)	G-R - W-B	Fuel pump relay	Ignition switch ON	0 to 3.0 V
FC (E8-10) - E1 (E6-1)	GR-B - W-B	Fuel pump control	Ignition switch ON	9 to 14 V
IGT1 (E4-8) - E1 (E6-1)	LG - W-B	Ignition coil with igniter (ignition signal)	Idling	Pulse generation (See waveform 9)
IGT2 (E4-15) - E1 (E6-1)	LG-B - W-B
IGT3 (E4-11) - E1 (E6-1)	L-W - W-B
IGT4 (E4-10) - E1 (E6-1)	L-Y - W-B
IGT5 (E4-13) - E1 (E6-1)	B-L - W-B
IGT6 (E4-12) - E1 (E6-1)	G - W-B
IGT7 (E4-14) - E1 (E6-1)	G-W - W-B
IGT8 (E4-9) - E1 (E6-1)	G-B - W-B
IGF1 (E4-24) - E1 (E6-1)	R-Y - W-B	Ignition coil with igniter (ignition confirmation signal)	Ignition switch ON	4.5 to 5.5 V
IGF2 (E4-25) - E1 (E6-1)	R-W - W-B
IGF1 (E4-24) - E1 (E6-1)	R-Y - W-B	Ignition coil with igniter (ignition confirmation signal)	Idling	Pulse generation (See waveform 9)
IGF2 (E4-25) - E1 (E6-1)	R-W - W-B
STP (E8-15) - E1 (E6-1)	G-Y - W-B	Stop lamp switch	Brake pedal depressed	7.5 to 14 V
STP (E8-15) - E1 (E6-1)	G-Y - W-B	Stop lamp switch	Brake pedal released	Below 1.5 V
ST1- (E8-16) - E1 (E6-1)	R-L - W-B	Stop lamp switch (opposite to STP terminal)	Ignition switch ON, Brake pedal depressed	Below 1.5 V
ST1- (E8-16) - E1 (E6-1)	R-L - W-B	Stop lamp switch (opposite to STP terminal)	Ignition switch ON, Brake pedal released	7.5 to 14 V
STAR/NSW (E5-8) - E1 (E6-1)	P - W-B	Park/Neutral position switch	Ignition switch ON, Shift lever position other than P and N	9 to 14 V
STAR/NSW (E5-8) - E1 (E6-1)	P - W-B	Park/Neutral position switch	Ignition switch ON, Shift lever position in P, N	Below 3.0 V
W (E7-30) - E1 (E6-1)	R-B - W-B	MIL	Idling	9 to 14 V
W (E7-30) - E1 (E6-1)	R-B - W-B	MIL	Ignition switch ON	Below 3.0 V
ELS1 (E7-13) - E1 (E6-1)	G - W-B	Electric load	Tail lamp switch ON, Defogger switch ON	7.5 to 14 V
ELS2 (E7-12) - E1 (E6-1)	Y-G - W-B	Electric load	Tail lamp switch OFF, Defogger switch OFF	0 to 1.5 V
TACH (E7-1) - E1 (E6-1)	B-W - W-B	Engine speed	Idling	Pulse generation (See waveform 11)
TC (E8-23) - E1 (E6-1)	P-L - W-B	Terminal TC of DLC 3	Ignition switch ON	9 to 14 V
STA (E6-11) - E1 (E6-1)	B-Y - W-B	Starter signal	Cranking	6 V or higher
STA (E6-11) - E1 (E6-1)	B-Y - W-B	Park/neutral position switch	Shift lever position P or N, Ignition switch START	9 to 14 V
STSW (E6-12) - E1 (E6-1)	L-Y - W-B	STA No.2 fuse	Shift lever position P or N, Ignition switch START	9 to 14 V
VPMP (E8-5) - E1 (E6-1)	R-G - W-B	Canister closed valve	Ignition switch ON	9 V to 14 V
MPMP (E8-6) - E1 (E6-1)	O - W-B	Leak detection pump	Vacuum pump OFF	0 V to 3 V
MPMP (E8-6) - E1 (E6-1)	O - W-B	Leak detection pump	Vacuum pump ON	9 V to 14 V
PPMP (E8-22) - E1 (E6-1)	R - W-B	Vapor pressure sensor	Ignition switch ON	3 V to 3.6 V
AIV1 (E4-27) - E1 (E6-1)	P - W-B	VSV for air injection control (Bank 1)	Ignition switch ON	9 to 14 V
AIV2 (E4-26) - E1 (E6-1)	L - W-B	VSV for air injection control (Bank 2)	Ignition switch ON	9 to 14 V
AIRV (E8-4) - E1 (E6-1)	Y - W-B	AI driver (ASV control signal)	Ignition switch ON	9 to 14 V
AIRP (E8-25) - E1 (E6-1)	G - W-B	AI driver (Air pump control signal)	Ignition switch ON	9 to 14 V
AIP (E4-32) - E1 (E6-1)	W-L - W-B	Air pressure sensor	Ignition switch ON	3 V to 3.6 V
(1) Shielded

WAVEFORM 1 

Fuel injector

ECM Terminal Names	Between #10 (to 40) and E01
Tester Ranges	20 V/DIV, 20 msec./DIV
Conditions	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 2 

Knock sensor

ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2
Tester Range	1 V/DIV, 1 msec./DIV
Condition	Maintain engine RPM at 2,000 rpm after engine warmed-up

HINT:

• The wavelength becomes shorter as the engine rpm increases.
• The waveforms and amplitudes displayed differ slightly depending on the vehicle.
  Fig 3: Waveform 2 - Knock Sensor

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM 3 

VVT OCV

ECM Terminal Name	Between OC1+ and OC1- Between OC2+ and OC2-
Tester Range	0.2 V/DIV, 200 msec./DIV
Condition	Accelerate slowly after engine warmed-up

HINT:

In the DATA LIST, the items VVT OCV DUTY B1 and B2 show the duty ratio of voltage flowing to the OCV (see Fig 4).

VVT OCV DUTY B1, B2 = A/B x 100 (%)

WAVEFORM 4 

1. VVT sensor bank 1
2. VVT sensor bank 2
3. Crankshaft position sensor
   WAVEFORM 4 DESCRIPTION
   
   

   ECM Terminal Name	(e) Between VV1+ and VV1- (f) Between VV2+ and VV2- (g) Between NE+ and NE-
   Tester Range	2 V/DIV, 20 msec./DIV
   Condition	Idle after engine warmed-up

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 5 

1. Camshaft position sensor
2. Crankshaft position sensor
   WAVEFORM 5 DESCRIPTION
   
   

   ECM Terminal Name	Between G2+ and G2-
   Tester Range	2 V/DIV, 200 msec./DIV
   Condition	Idle after engine warmed-up

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 6 

Vehicle speed signal

ECM Terminal Name	Between SP2+ and SP2-
Tester Range	5 V/DIV, 10 msec./DIV
Condition	Driving by 40 km/h (25 mph)

HINT:

The wavelength becomes shorter as vehicle speed increases.

WAVEFORM 7 

Throttle actuator positive terminal

ECM Terminal Name	Between M+ and ME01
Tester Range	5 V/DIV, 1 msec./DIV
Condition	Idle after engine warmed-up

HINT:

The duty ratio varies depending on the throttle opening operation.

WAVEFORM 8 

Throttle actuator negative terminal

ECM Terminal Name	Between M- and ME01
Tester Range	5 V/DIV, 1 msec./DIV
Condition	Idle after engine warmed-up

HINT:

The duty ratio varies depending on the throttle opening operation.

WAVEFORM 9 

1. Igniter IGT signal (from ECM to igniter)
2. Igniter IGF signal (from igniter to ECM)
   WAVEFORM 9 DESCRIPTION
   
   

   ECM Terminal Name	(a) Between IGT1 (to IGT8) and E1 (b) Between IGF1 (IGF2) and E1
   Tester Range	2 V/DIV, 20 msec./DIV
   Condition	Idling

HINT:

The wavelength becomes shorter as vehicle speed increases.

WAVEFORM 10 

Heated oxygen sensor

ECM Terminal Names	Between OX1B and E2
Tester Ranges	0.2 V/DIV, 200 msec./DIV
Conditions	Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor

HINT:

In the DATA LIST, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.

WAVEFORM 11 

Engine speed signal

ECM Terminal Names	Between TACH and E1
Tester Ranges	5 V/DIV, 10 msec./DIV
Conditions	Idling

HINT:

The wavelength becomes shorter as vehicle speed increases.