Terminals Of Ecu

CHECK MAIN BODY ECU

Fig 1: Identifying Connector Terminals Of Main Body ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the A68, L13 and DA main body ECU connectors.

Measure the voltage and resistance according to the value(s) in the table below.

MAIN BODY ECU (DISCONNECTED)

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
L13-6 (AM1)- Body ground	W - Body ground	+B power supply	Always	11 to 14 V
L12-1 (AM2) - Body ground	W - Body ground	+B power supply	Always	11 to 14 V
L13-17(SSW1)-Body ground	W - Body ground	Engine switch 1 input	Engine switch pushed	Below 1 Ω
L13-17(SSW1)-Body ground	W - Body ground	Engine switch 1 input	Engine switch not pushed	10 kΩ or higher
L13-16(SSW2)-Body ground	L - Body ground	Engine switch 2 input	Engine switch pushed	Below 1 Ω
L13-16(SSW2)-Body ground	L - Body ground	Engine switch 2 input	Engine switch not pushed	10 kΩ or higher
DA-40(GND1)-Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
DA-23 or DA-52(LIN1)-Body ground	0 - Body ground	LIN line	Always	10 kΩ or higher

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

Reconnect the A68, L13 and DA main body ECU connectors.

Measure the voltages according to the value(s) in the table below.

MAIN BODY ECU (RECONNECTED)

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

L13-22(ACCD)-DA-40 (GND1)

G-W-B

D-ACC relay drive signal

Engine switch on (ACC)

11 to 14 V

L13-22(ACCD)-DA-40 (GND1)

G-W-B

D-ACC relay drive signal

Engine switch off

Below 1 V

L12-11 (IG2D)-DA-40 (GND1)

P-W-B

IG2 relay drive signal

Engine switch on (IG)

11 to 14 V

L12-11 (IG2D)-DA-40 (GND1)

P-W-B

IG2 relay drive signal

Engine switch on (ACC)

Below 1 V

L13-19(SLR+)-DA-40 (GND1)

SB - W-B

Steering lock power supply

Steering lock motor operating

Below 1 V

L13-19(SLR+)-DA-40 (GND1)

SB - W-B

Steering lock power supply

Steering lock motor not operating

11 to 14 V

L13-18(SLP)-DA-40 (GND1)

LG - W-B

Steering lock actuator position signal

Steering lock locked

11 to 14 V

L13-18(SLP)-DA-40 (GND1)

LG - W-B

Steering lock actuator position signal

Steering lock released

Below 1 V

L11-9(SPD)-DA-40 (GND1)

V-W-B

Speed signal from combination meter

Engine switch on (IG), rotate driving wheel slowly

Pulse generation (see WAVEFORM 1 )

L11-8(TACH)-DA-40 (GND1)

B-W-B

Tachometer signal

Engine running

Pulse generation (see WAVEFORM 2 )

A68-4 (STSW) - DA-40 (GND1)

B-W-B

Starter activation request signal

Brake pedal depressed with shift lever in P or N, engine switch pushed once

11 to 14 V⁽¹⁾

L13-8(STR)-DA-40 (GND1)

L-W-B

Park / neutral position switch

Shift lever in P or N

Below 1 V

A68-6 (STR2) - DA-40 (GND1)

BR - W-R

Starter signal

Brake pedal depressed with shift lever in P or N, engine switch pushed once

11 to 14 V⁽¹⁾

L13-15(INDS)-DA-40 (GND1)

B-W-B

Vehicle condition signal

Brake pedal depressed with shift lever in P or N, engine switch off, on (ACC, IG)

9 to 14 V

L13-14(INDW)-DA-40 (GND1)

P-W-B

Vehicle condition signal

Brake pedal released with shift lever in P or N, engine switch off, on (ACC, IG)

9 to 14 V

L13-25(SWIL)-DA-40 (GND1)

R-W-B

Illumination signal

Light control switch TAIL or HEAD

11 to 14 V

DH-15(STP)-DA-40 (GND1)

L-W-B

Stop light switch signal

Brake pedal depressed

11 to 14 V

HINT:

⁽¹⁾	Voltage is output for 0.3 seconds before the engine is started.

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

Using an oscilloscope, check waveform 1.

Fig 2: Identifying Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 1 (Reference)

WAVEFORM 1 REFERENCE

Item	Content
Terminal No. (Symbols)	L11-9 (SPD) - DA-40 (GND1)
Tool setting	5V/DIV., 10msec./DIV.
Condition	Driving at approx. 20 km/h (12 mph)

HINT:

As the vehicle speed increases, the wavelength shortens.

Using an oscilloscope, check waveform 2.

Fig 3: Identifying Waveform 2

Waveform 2 (Reference)

WAVEFORM 2 REFERENCE

Item	Content
Terminal No. (Symbols)	L11-8 (TACH) - DA-40 (GND1)
Tool setting	5V/DIV., 10msec./DIV.
Condition	Engine idling

HINT:

As the vehicle speed increases, the wavelength shortens.

CHECK CERTIFICATION ECU

Fig 4: Identifying Connector Terminals Of Certification ECU

Disconnect the L15 certification ECU connector.

Measure the voltage and resistance according to the value(s) in the table below.

CERTIFICATION ECU (DISCONNECT)

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
L15-1 (+B1)-Body ground	L - Body ground	+B power supply	Always	11 to 14 V
L15-18 (IG) - Body ground	L - Body ground	Ignition power supply	Engine switch on (IG)	11 to 14 V
L15-18 (IG) - Body ground	L - Body ground	Ignition power supply	Engine switch off	Below 1 V
L15-10 (LIN) -Body ground	0 - Body ground	LIN line	Always	10 kΩ or higher
L15-17(E)- 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.

CHECK ECM

Fig 5: Identifying Connector Terminals Of ECM

Disconnect the A13, A14, E2 and E3 ECM connectors.

Measure the voltage and resistance according to the value(s) in the table below.

ECM (DISCONNECT)

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
A14-7 (BATT) - E3-1 (E1)	B-W-B	Battery (for measuring battery voltage and for ECM memory)	Always	11 to 14 V
A13-1 (+B)-E3-1 (E1)	BW - W-B	Power source of ECM	Engine switch on (IG)	11 to 14 V
A14-8 (IG SW) - E3-1 (E1)	R-BR	Engine switch signal	Always	11 to 14 V
E3-1 (E1)-Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
E2-1 (E02) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
E3-4 (E04) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
E2-2(E01)-Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
A13-5(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 A13, A14, E2 and E3 ECM connectors.

Measure the voltage according to the value(s) in the table below.

ECM (RECONNECT)

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
A13-20(STA)-E3-1 (E1)	Y-W-B	Starter relay operation signal	Cranking	5.5 V or more
A13-19(ACCR)-E3-1 (E1)	G-W-B	D-ACC relay cut signal (output)	Engine switch on (IG) → Cranking	11 to 14 V → Below 1 Ω
A14-15(TACH)-E3-1 (E1)	R-W-B	Engine revolution signal (output)	Idling	Pulse generation (see WAVEFORM 1 )
A14-2 (STAR)-E3-1 (E1)	BR - W-B	Starter relay drive signal	Cranking	11 to 14 V

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

Using an oscilloscope, check waveform 1.

Fig 6: Identifying Waveform 1

Waveform 1 (Reference)

WAVEFORM 1 REFERENCE

Item	Content
Terminal No. (Symbols)	A14-15(TACH)-E3-1 (E1)
Tool setting	5V/DIV.,10msec./DIV.
Condition	Engine idling

HINT:

As the vehicle speed increases, the wavelength shortens.

CHECK STEERING LOCK ECU

Fig 7: Identifying Connector Terminals Of Steering Lock ECU

Disconnect the L33 steering lock ECU connector.

Measure the voltage and resistance according to the value(s) in the table below.

STEERING LOCK ECU

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
L33-7 (B) - Body ground	P - Body ground	+B power supply	Always	11 to 14 V
L33-6 (IG2) - Body ground	L - Body ground	Ignition power supply	Engine switch on (IG)	11 to 14 V
L33-6 (IG2) - Body ground	L - Body ground	Ignition power supply	Engine switch off	Below 1 V
L33-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
L33-2 (SGND) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω

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