Terminals Of Ecu

CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

Fig 1: Identifying Main Body ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the D7, D8, D9, 1E, 1F and 1M connectors.

Measure the voltage and resistance of the wire harness side connector.

MAIN BODY ECU TERMINALS REFERENCE CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D8-6 (AM1) - Body ground	GR - Body ground	+B power supply	Always	11 to 14 V
D7-1 (AM2) - Body ground	G - Body ground	+B power supply	Always	11 to 14 V
D8-16 (SSW2) - Body ground	BR - Body ground	Engine switch signal	Engine switch pushed	Below 1 Ω
D8-16 (SSW2) - Body ground	BR - Body ground	Engine switch signal	Engine switch not pushed	10 kΩ or higher
D8-17 (SSW1) - Body ground	P - Body ground	Engine switch signal	Engine switch pushed	Below 1 Ω
D8-17 (SSW1) - Body ground	P - Body ground	Engine switch signal	Engine switch not pushed	10 kΩ or higher
1M-9 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
D9-5 (CANH) - Body ground	GR - Body ground	CAN Line	Always	10 kΩ or higher
D9-6 (CANL) - Body ground	W - Body ground	CAN Line	Always	10 kΩ or higher
D9-15 (CANN) - Body ground^*1	W - Body ground	CAN Line	Always	10 kΩ or higher
D9-16 (CANP) - Body ground^*1	Y - Body ground	CAN Line	Always	10 kΩ or higher
1F-10 (GND1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
1E-7 (LIN1)- Body ground	R - Body ground	LIN line	Always	10 kΩ or higher
HINT: *1: w/ Power back door

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the connectors.

Measure the voltage of the connector.

TERMINAL DESCRIPTION CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D7-3 (ACCR) - 1M-9 (GND2)	O - W-B	Starter assist signal (ACC cut signal)	Brake pedal depressed, shift lever P position, engine switch is pushed once → on (IG)	0.1 to 0.8 V^*1 → Output voltage at terminal AM1 or AM2 is -2 V or more.
D7-11 (IG2D) - 1M-9 (GND2)	Y - W-B	IG2 signal	Engine switch on (IG)	Output voltage at terminal AM1 or AM2 is -2 V or more.
D7-11 (IG2D) - 1M-9 (GND2)	Y - W-B	IG2 signal	Engine switch on (ACC)	Below 1 V
D8-3 (IG1D) - 1M-9 (GND2)	SB - W-B	IG1 signal	Engine switch on (IG)	Output voltage at terminal AM1 or AM2 is -2 V or more.
D8-3 (IG1D) - 1M-9 (GND2)	SB - W-B	IG1 signal	Engine switch on (ACC)	Below 1 V
D8-8 (STR) - 1M-9 (GND2)	B - W-B	Park/Neutral position switch signal	Engine switch on (IG), shift lever except P or N position → P or N position	Below 2 V → Pulse generation ^*3
D8-18 (SLP) - 1M-9 (GND2)	O - W-B	Steering lock actuator position signal	Steering lock is locked	Pulse generation (See waveform 3 3)
D8-18 (SLP) - 1M-9 (GND2)	O - W-B	Steering lock actuator position signal	Steering lock is released	Pulse generation (See waveform 3 3)
D8-19 (SLR+) - 1M-9 (GND2)	Y - W-B	Steering lock motor signal	Steering lock motor operating	Below 1 V
D8-19 (SLR+) - 1M-9 (GND2)	Y - W-B	Steering lock motor signal	Steering lock motor does not operate	Output voltage at terminal AM1 or AM2 is -2 V or more.
D8-22 (ACCD) - 1M-9 (GND2)	GR - W-B	ACC signal	Engine switch on (ACC)	Output voltage at terminal AM1 or AM2 is -2 V or more.
D8-22 (ACCD) - 1M-9 (GND2)	GR - W-B	ACC signal	Engine switch off	Below 1 V
D8-25 (SWIL) - 1M-9 (GND2)	R - W-B	Illumination signal	Light control switch TAIL or HEAD	Output voltage at terminal AM1 or AM2 is -2 V or more.
D9-8 (TACH) - 1M-9 (GND2)	BR - W-B	Tachometer signal	Engine running	Pulse generation (See waveform 2 2)
D9-9 (SPD) - 1M-9 (GND2)	R - W-B	Vehicle speed signal	Engine switch on (IG), rotate rear wheel slowly	Pulse generation (See waveform 1 1)
D10-4 (STSW) - 1M-9 (GND2)	P - W-B	Starter activation request signal	Brake pedal depressed, engine switch held on (ST)	Output voltage at terminal AM1 or AM2 is -2 V or more.
D10-6 (STR2) - 1M-9 (GND2)	LG - W-B	Starter signal (Sub)	Brake pedal depressed, shift lever P or N position, engine switch on (ST)	Output voltage at terminal AM1 or AM2 is -3.5 V or more. ^*2
1F-2 (ACC) - Body ground	SB - Body ground	ACC power supply	Always	11 to 14 V
1A-1 (IG) - Body ground	B - Body ground	IG power supply	Always	11 to 14 V
1M-7 (STP) - 1M-9 (GND2)	GR - W-B	Stop light signal	Brake pedal depressed	Output voltage at terminal AM1 or AM2 is -2 V or more.
1M-7 (STP) - 1M-9 (GND2)	GR - W-B	Stop light signal	Brake pedal released	Below 1 V
HINT: 1: Voltage is output only when the engine is cranking. 2: Voltage is output for 0.3 seconds when the engine is cranking to start. Disconnect the B3 connector from the ECM and starter cut relay before measuring the voltage. *3: Remove the starter cut relay before measuring the voltage.

If the result is not as specified, the ECU may have a malfunction.

Using an oscilloscope, check the signal waveform of the ECU.

Waveform 1

Waveform 1 (Reference):

WAVEFORM REFERENCE CHART

Terminal No.	D9-9 (SPD) - 1M-9 (GND2)
Tool Setting	5V/DIV., 10 ms./DIV.
Vehicle Condition	Driving at approx. 20 km/h (12 mph)

Fig 2: Identifying Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

As the vehicle speed increases, the wavelength shortens.

Waveform 2

Waveform 2 (Reference):

WAVEFORM REFERENCE CHART

Terminal No.	D9-8 (TACH) - 1M-9 (GND2)
Tool Setting	5V/DIV., 10 ms./DIV.
Vehicle Condition	Engine idling

HINT:

As the engine revolution speed increases, the wavelength shortens.

Fig 3: Identifying Waveform 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 3

Waveform 3 (Reference):

WAVEFORM REFERENCE CHART

Terminal No.	D8-18 (SLP) - 1M-9 (GND2)
Tool Setting	2V/DIV., 100 ms./DIV.
Vehicle Condition	Steering lock/unlock

CHECK CERTIFICATION ECU

Fig 4: Identifying Waveform 3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Identifying Certification ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the D40 ECU connector.

Measure the voltage and resistance of the wire harness side connector.

TERMINAL DESCRIPTION CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D40-1 (+B) - Body ground	B - Body ground	+B power supply	Always	11 to 14 V
D40-10 (LIN) - Body ground	L - Body ground	LIN line	Always	10 kΩ or higher
D40-17 (E) - Body ground	B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the ECU connector.
Measure the voltage of the connector.

TERMINAL DESCRIPTION CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D40-18 (IG) - Body ground	G - Body ground	Ignition power supply	Engine switch on (IG)	11 to 14 V
D40-18 (IG) - Body ground	G - Body ground	Ignition power supply	Engine switch off	Below 1 V

If the result is not as specified, the ECU may have a malfunction.

CHECK ECM

Fig 6: Identifying ECM Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the B1, B2, B3 and D35 ECM connectors.

Measure the voltage and resistance of the wire harness side connectors.

TERMINAL DESCRIPTION CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D35-2 (+B2) - Body ground	GR - Body ground	Power source of ECM	Engine switch on (IG)	11 to 14 V
D35-1 (+B) - Body ground	SB - Body ground	Power source of ECM	Engine switch on (IG)	11 to 14 V
D35-9 (IG SW) - Body ground	W - Body ground	Engine switch signal	Engine switch on (IG)	11 to 14 V
B2-3 (ME01) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
B1-6 (E02) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
B1-7 (E01) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
B2-7 (E04) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
B2-6 (E05) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
B3-1 (E1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
B2-4 (E03) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the ECM connectors.

Measure the voltage of the connectors.

TERMINAL DESCRIPTION CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D35-17 (ACCR) - B3-1 (E1)	O - W-B	ACC relay cut signal (output)	Brake pedal depressed, shift lever P or N position, engine switch is pushed once → on (IG)	0.1 to 0.8 V^*1 → Output voltage at terminal AM1 or AM2 is -2 V or more.
B3-12 (STSW) - B3-1 (E1)	P - W-B	Starter activation request signal	Brake pedal depressed, engine switch held (IG)	Output voltage at terminal AM1 or AM2 is -2 V or more.
D36-1 (TACH) - B3-1 (E1)	B - W-B	Engine revolution signal (output)	Idling	Pulse generation (see waveform 1)
D35-15 (STP) - B3-1 (E1)	R - W-B	Stop light switch signal (input)	Brake pedal depressed	7.5 to 14 V
D35-15 (STP) - B3-1 (E1)	R - W-B	Stop light switch signal (input)	Brake pedal released	Below 1.5 V
B3-11 (STA) - B3-1 (E1)	B - W-B	Starter relay operation signal	Cranking	11 to 14 V
B2-8 (STAR) - B3-1 (E1)	GR - W-B	Starter signal (Main)	Brake pedal depressed, shift lever P or N position, engine switch on (ST)	11 to 14 V
HINT: *1: Voltage is output only when the engine is cranking.

If the result is not as specified, the ECM may have a malfunction.

Using an oscilloscope, check the signal waveform of the ECM.

Waveform 1 (Reference):

WAVEFORM REFERENCE CHART

Terminal No.	D36-1 (TACH) - B3-1 (E1)
Tool Setting	5V/DIV., 10 ms./DIV.
Vehicle Condition	Engine idling

Fig 7: Identifying Waveform 1

HINT:

As the vehicle speed increases, the wavelength shortens.

CHECK STEERING LOCK ECU

Fig 8: Identifying D11 ECU Connector Terminals

Disconnect the D11 ECU connector.

Measure the voltage and resistance of the wire harness side connector.

TERMINAL DESCRIPTION CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D11-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
D11-2 (SGND) - Body ground	W - Body ground	Ground	Always	Below 1 Ω
D11-6 (IG2) - Body ground	V - Body ground	Ignition power supply	Engine switch on (IG)	11 to 14 V
D11-6 (IG2) - Body ground	V - Body ground	Ignition power supply	Engine switch off	Below 1 V
D11-7 (B) - Body ground	G - Body ground	+B power supply	Always	11 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the D11 ECU connector.
Measure the voltage of the connector.

TERMINAL DESCRIPTION CHART

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D11-4 (SLP1) - D11-1 (GND)	O - W-B	Steering lock actuator position signal	Steering is locked	11 to 14 V
D11-4 (SLP1) - D11-1 (GND)	O - W-B	Steering lock actuator position signal	Steering is released	Below 1 V

If the result is not as specified, the ECU may have a malfunction.