Terminals Of Ecu

CHECK POWER SOURCE CONTROL ECU ASSEMBLY

Fig 1: Identifying Power Source Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the D44 ECU connector.

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

TERMINALS REFERENCE (STANDARD)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
AM1 (D44-33) - Body ground	W - Body ground	+B power supply	Always	10 to 14 V
AM2 (D44-12) - Body ground	L - Body ground	+B power supply	Always	10 to 14 V
Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
SSW1 (044-14) - Body ground	L - Body ground	Engine switch signal	Engine switch pushed → Not pushed	Below 1 Ω → 10 kΩ or higher
SSW2 (D44-37) - Body ground	V - Body ground	Engine switch signal	Engine switch pushed → Not pushed	Below 1 Ω → 10 kΩ or higher
GND2 (D44-6) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
MPX1 (D44-7) - Body ground	B - Body ground	MPX line	Always	10 kΩ or higher
MPX2 (D44-24) - Body ground	LG - Body ground	MPX line	Always	10 kΩ or higher
LIN1 (D44-30) - Body ground	BR - 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 D44 ECU connector.

Measure the voltage of the connector.

STANDARD VOLTAGE TERMINALS REFERENCE

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specified Condition see

ACCD (D44-11) - GND2 (D44-6)

R - W-B

ACC signal

Engine switch OFF → Engine switch ON (ACC)

Below 1 V → 10 to 14 V

IG1D (D44-34) - GND2 (D44-6)

LG - W-B

IG1 signal

Engine switch ON(ACC) → Engine switch ON (IG)

Below 1 V → 10 to 14 V

IG2D (D44-35) - GND2 (D44-6)

Y - W-B

IG2 signal

Engine switch ON(ACC) → Engine switch ON (IG)

Below 1V → 10 to 14 V

STP (D44-1) - GND2 (D44-6)

P - W-B

Stop light signal

Brake pedal depressed → Released

10 to 14 V → Below 1 V

SLR+ (D44-32) - GND2 (D44-6)

BR - W-B

Power source for steering lock actuator

Steering lock motor operate → not operate

Below 1 V → 10 to 14 V

SLP (044-26) - GND2 (D44-6)

GR - W-B

Steering lock actuator UNLOCK position signal

Steering is locked → released

10 to 14 V → Below 1 V

SPD (D44-19) - GND2 (D44-6)

W - W-B

Vehicle speed signal

Engine switch ON (IG), Rotate driving wheel slowly

Pulse generation

TACH (D44-2) - Body ground

L - Body ground

Engine revolution speed signal

Idling

Pulse generation (see 1waveform 1)

P (D44-5) - Body ground

P - Body ground

Shift lock signal

Shift lever P position → D position

Below 1 V → 10 to 14 V

CTSW (D44-31) - Body ground

O - Body ground

Starter assist signal

Brake pedal depressed, Engine switch ON (START)

(⁽¹⁾) Below 1 V

STSW (044-39) - Body ground

R - Body ground

Starter activation request signal

Brake pedal depressed, Engine switch ON (START)

(⁽¹⁾) 10 to 14 V

STR1 (D44-17) - GND2 (D44-6)

SB - W-B

Park / neutral position switch

Shift lever P or N position, Engine switch ON (START)

10 to 14 V

STR2 (D44-15) - GND2 (D44-6)

B - W-B

Starter signal

Shift lever P or N position, Engine switch ON (START)

10 to 14 V

INDS (D44-4) - Body ground

Y - Body ground

Vehicle condition signal

Brake pedal depressed, Shift lever P or N position, Engine switch ON (ACC, IG, START)

10 to 14 V

INDW (D44-13) - Body ground

GR - Body ground

Warning signal

Smart key system malfunction

Pulse generation

SWIL (D44-36) - Body ground

R - Body ground

Illumination signal

Light control switch TAIL or HEAD

10 to 14 V

⁽¹⁾	Voltage is output only when the engine is cranking.

⁽²⁾	Voltage is output for 0.3 seconds after engine start.

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

WAVEFORM 1

Engine speed signal

Fig 2: Identifying Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINALS REFERENCE

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

HINT:

The wavelength becomes shorter as the engine RPM increases.

CHECK CERTIFICATION ECU

Fig 3: Identifying Certification ECU Connector Terminals

Disconnect the D39 ECU connector.

Measure the resistance of the wire harness side connector.

Standard resistance

TERMINALS REFERENCE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
LIN (D39-10) - E (D39-17)	BR - W-B	LIN line	Always	Below 1 Ω
E (D39-17) - 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 D39 ECU connector.

Measure the voltage of the connector.

Standard voltage

TERMINALS REFERENCE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+B1 (D39-1) - E (D39-17)	R - W-B	Battery	Always	10 to 14 V
IG (D39-18) - E (D39-17)	Y - W-B	Engine switch (IG)	Engine switch OFF → ON (IG)	Below 1 V → 10 to 14 V
ACC (D39-19) - E (D39-17)	SB - W-B	Engine switch (ACC)	Engine switch OFF → ON (ACC)	Below 1 V → 10 to 14 V

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

CHECK ECM

Fig 4: Identifying ECM Connector Terminals

Disconnect the A24 and B45 ECM connectors.

Measure the resistance and voltage of the connectors.

Standard

TERMINALS REFERENCE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+B (A24-1) - E1 (B47-1)	L - BR	Power source of ECM	Engine switch ON (IG)	10 to 14 V
+B2 (A24-2) - E1 (B47-1)	R - BR	Power source of ECM	Engine switch ON (IG)	10 to 14 V
IGSW (A24-9) - E1 (B47-1)	Y - BR	Ignition switch signal	Engine switch ON (IG)	10 to 14 V
E01 (B45-7) - Body ground	W-B - Body ground	Earth (ground) circuit of ECM	Always	Below 1 Ω
E1 (B47-1) - Body ground	BR - Body ground	Earth (ground) circuit of ECM	Always	Below 1 Ω

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

Reconnect the A24 and B45 ECM connectors.

Measure the voltage of the connectors.

Standard voltage

TERMINALS REFERENCE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
STA (B47-11) - E1 (B47-1)	B - BR	Starter relay operation signal	Cranking	10 to 14 V
ACCR (A24-17) - E1 (B47-1)	B - BR	ACC relay cut signal output	Engine switch ON (IG)	10 to 14 V
TACH (D41-1) - E1 (B47-1)	W - BR	Engine revolution start control signal output	Idling	Pulse generation
STP (A24-15) - E1 (B47-1)	W - BR	Stop tight switch signal input	Brake pedal depressed → Brake pedal released	7.5 to 14 V → Below 1.5V
STAR (B46-8) - E1 (B47-1)	B-W - BR	PNP switch signal input	Engine switch ON	10 to 14 V

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

CHECK STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

Fig 5: Identifying D14 Connector Terminals

Disconnect the D14 actuator connector.

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

Standard

TERMINALS REFERENCE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
B (D14-7) - Body ground	B - Body ground	+B power supply	Always	10 to 14 V
GND (D14-1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
SGND (D14-2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
LIN (D14-5) - Body ground	R - Body ground	LIN line	Always	10 kΩ or higher

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

Reconnect the D14 ECU connector.

Measure the voltage of the connectors.

Standard voltage

TERMINALS REFERENCE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
IG2 (D14-6) - Body ground	V - Body ground	Ignition power supply	Engine switch ON (IG)	10 to 14 V
SLP1 (D14-4) - GND (D14-1)	GR - W-B	Steering lock actuator UNLOCK position signal	Steering is locked → released	Below 1 V → 10 to 14 V
IGE (D14-3) - GND (D14-1)	BR - W-B	Power source for steering lock actuator	Steering lock motor operate → not operate	Below 1 V → 10 to 14 V