Terminals Of Ecu

CHECK POWER SOURCE CONTROL ECU

Fig 1: Identifying Power Source Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the J55 ECU connector.

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

POWER SOURCE CONTROL ECU (DISCONNECT J55 ECU CONNECTOR)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
AM1 (J55-33) - Body ground	O - Body ground	+B power supply	Always	10 to 14 V
AM2 (J55-12) - Body ground	O - Body ground	+B power supply	Always	10 to 14 V
SSW1 (J55-14) - Body ground	B - Body ground	Engine switch signal	Engine switch pushed	Below 1 ohms
SSW1 (J55-14) - Body ground	B - Body ground	Engine switch signal	Engine switch not pushed	10 k ohms or higher
SSW2 (J55-37) - Body ground	SB - Body ground	Engine switch signal	Engine switch pushed	Below 1 ohms
SSW2 (J55-37) - Body ground	SB - Body ground	Engine switch signal	Engine switch not pushed	10 k ohms or higher
GND2 (J55-6) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms
LIN1 (J55-30) - Body ground	V - Body ground	LIN line	Always	10 k ohms or higher
MPX1 (J55-7) - Body ground	GR - Body ground	MPX line	Always	10 k ohms or higher
MPX2 (J55-24) - Body ground	GR - Body ground	MPX line	Always	10 k ohms or higher

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

Reconnect the J55 ECU connector.

Measure the voltage of the connector.

POWER SOURCE CONTROL ECU (RECONNECT J55 ECU CONNECTOR)

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specified Condition

ACCD (J55-11) - GND2 (J55-6)

LG - W-B

ACC signal

Engine switch on (ACC)

10 to 14 V

ACCD (J55-11) - GND2 (J55-6)

LG - W-B

ACC signal

Engine switch off

Below 1 V

IG1D (J55-34) - GND2 (J55-6)

P - W-B

IG1 signal

Engine switch on (IG)

10 to 14 V

IG1D (J55-34) - GND2 (J55-6)

P - W-B

IG1 signal

Engine switch on (ACC)

Below 1 V

IG2D (J55-35) - GND2 (J55-6)

LG - W-B

IG2 signal

Engine switch on (IG)

10 to 14 V

IG2D (J55-35) - GND2 (J55-6)

LG - W-B

IG2 signal

Engine switch on (ACC)

Below 1 V

STP (J55-1) - GND2 (J55-6)

R - W-B

Stop light signal

Brake pedal depressed

10 to 14 V

STP (J55-1) - GND2 (J55-6)

R - W-B

Stop light signal

Brake pedal released

Below 1 V

SLR+ (J55-32) - GND2 (J55-6)

W - W-B

Steering lock motor signal

Steering lock motor operating

Below 1 V

SLR+ (J55-32) - GND2 (J55-6)

W - W-B

Steering lock motor signal

Steering lock motor does not operate

10 to 14 V

SLP (J55-26) - GND2 (J55-6)

R - W-B

Steering lock actuator position signal

Steering lock is locked

10 to 14 V

SLP (J55-26) - GND2 (J55-6)

R - W-B

Steering lock actuator position signal

Steering lock is released

Below 1 V

SPD (J55-19) - GND2 (J55-6)

P - W-B

Vehicle speed signal

Engine switch on (IG), rotate rear wheel slowly

Pulse generation (See Fig 2 for waveform 1)

TACH (J55-2) - GND2 (J55-6)

W - W-B

Tachometer signal

Engine running

Pulse generation (See Fig 3 for waveform 2)

P (J55-5) - GND2 (J55-6) ⁽³⁾

BR - W-B

Shift lock signal

Shift lever P position

10 to 14 V

P (J55-5) - GND2 (J55-6) ⁽³⁾

BR - W-B

Shift lock signal

Shift lever not P position

Below 1 V

CTSW (J55-31) - GND2 (J55-6)

LG - W-B

Starter assist signal

Brake pedal depressed, shift lever P position, engine switch is pushed once --> on (IG)

0.1 to 0.8 V ⁽¹⁾ --> 10 to 14 V

STSW (J55-39) - GND2 (J55-6)

L - W-B

Starter activation request signal

Brake pedal (A/T) or clutch pedal (M/T) depressed, engine switch hold on (ST)

10 to 14 V ⁽²⁾

STR1 (J55-17) - GND2 (J55-6)

SB - W-B

Park/neutral position switch

Shift lever P or N (A/T) position
Clutch pedal depressed (M/T)

Below 1 V

STR2 (J55-15) - GND2 (J55-6)

V - W-B

Starter signal

Brake pedal (A/T) or clutch pedal (M/T) depressed, shift lever P or N position (A/T), engine switch on (ST)

10 to 14 V ⁽²⁾

INDS (J55-4) - GND2 (J55-6)

L - W-B

Vehicle condition signal

Brake pedal (A/T) or clutch pedal (M/T) depressed, shift lever P position (A/T).

10 to 14 V

INDW (J55-13) - GND2 (J55-6)

BR - W-B

Warning signal

Brake pedal (A/T) or clutch pedal (M/T) depressed, shift lever P position (A/T), engine switch on (ACC, IG)

10 to 14 V

SWIL (J55-36) - GND2 (J55-6)

Y - W-B

Illumination signal

Light control switch TAIL or HEAD

10 to 14 V

SKSW (J55-28) - GND2 (J55-6)

B - W-B

Key in vehicle signal

Engine switch on (ACC, IG)

Below 1 V

HINT:

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

⁽²⁾	Voltage is output for 0.3 seconds when engine is cranking start. Disconnect the E4 connector from the ECM before measuring the voltage.

⁽³⁾	A/T 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 1 REFERENCE

Terminal No.	J55-19 - Body ground
Tool Setting	5 V/DIV., 10 ms./DIV.
Vehicle Condition	Driving at approx. 20 km/h (12 mph)

Fig 2: Identifying Oscilloscope Waveform Graph 1

HINT:

As the engine revolution speed increases, the wavelength shortens.

Waveform 2

Waveform 2 (Reference):

WAVEFORM 2 REFERENCE

Terminal No.	J55-2 - Body ground
Tool Setting	5 V/DIV., 10 ms./DIV.
Vehicle Condition	Engine idling

Fig 3: Identifying Oscilloscope Waveform Graph 2

HINT:

As the vehicle speed increases, the wavelength shortens.

CHECK CERTIFICATION ECU

Fig 4: Identifying Certification ECU Connector Terminals

Disconnect the P33 ECU connector.
Measure the voltage and resistance of the wire harness side connector.

CERTIFICATION ECU (DISCONNECT P33 ECU CONNECTOR)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+B1 (P33-1) - Body ground	L - Body ground	+B power supply	Always	10 to 14 V
IG (P33-18) - Body ground	B - Body ground	Ignition power supply	Engine switch on (IG)	10 to 14 V
IG (P33-18) - Body ground	B - Body ground	Ignition power supply	Engine switch off	Below 1 V
LIN (P33-10) - Body ground	V - Body ground	LIN line	Always	10 k ohms or higher
E (P33-17) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms

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

CHECK ECM

Fig 5: Identifying ECU Connector Terminals

Disconnect the A5, E5, E4, E3 and E6 ECM connectors.

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

ECM (DISCONNECT A5, E5, E4, E3 AND E6 ECM CONNECTORS)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+B (A5-6) - Body ground	B-R - Body ground	Power source of ECM	Engine switch on (IG)	10 to 14 V
+B1 (A5-5) - Body ground	B-R - Body ground	Power source of ECM	Engine switch on (IG)	10 to 14 V
IGSW (A5-17) - Body ground	B-W - Body ground	Ignition switch signal	Engine switch on (IG)	10 to 14 V
E01 (E5-2) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms
E02 (E5-1) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms
E03 (E3-6) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms
E04 (E6-5) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms
E05 (E6-3) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms
E1 (E4-7) - Body ground	BR - Body ground	Ground	Always	Below 1 ohms
EC (A5-2) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms
ME01 (E3-4) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms

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

Reconnect the A5, E5, E4, E3 and E6 ECM connectors.

Measure the voltage of the connectors.

ECM (RECONNECT A5, E5, E4, E3 AND E6 ECM CONNECTORS)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
STA (A5-12) - E1 (E4-7)	R - BR	Starter relay operation signal	Cranking	10 to 14 V
ACCR (A5-11) - E1 (E4-7)	W-L - BR	ACC relay cut signal (output)	Engine switch on (IG)	10 to 14 V
TACH (A6-16) - E1 (E4-7)	W-R - BR	Engine revolution signal (output)	Idling	Pulse generation (see Fig 6 for waveform 1)
STP (A6-4) - E1 (E4-7)	R-B - BR	Stop light switch signal (input)	Brake pedal depressed	7.5 to 14 V
STP (A6-4) - E1 (E4-7)	R-B - BR	Stop light switch signal (input)	Brake pedal released	Below 1.5 V
STAR (E4-4) - E1 (E4-7)	L-Y - BR	PNP switch signal (input)	Engine switch on (IG), shift position P or N	10 to 14 V
KSW (A5-23) - E1 (E4-7)	L-R - BR	Engine switch signal (input)	Engine switch off	4 to 6 V
KSW (A5-23) - E1 (E4-7)	L-R - BR	Engine switch signal (input)	When engine switch is pushed once	10 to 14 V
KSW (A5-23) - E1 (E4-7)	L-R - BR	Engine switch signal (input)	Engine switch on (ACC)	Below 1.5 V

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 1 REFERENCE

Terminal No.	A6-16 - E7-4
Tool Setting	5 V/DIV., 10 ms./DIV.
Vehicle Condition	Engine idling

Fig 6: Identifying Oscilloscope Waveform Graph 1

HINT:

As the vehicle speed increases, the wavelength shortens.

CHECK STEERING LOCK ECU

Fig 7: Identifying Steering Lock ECU Connector Terminals

Disconnect the J29 ECU connector.

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

STEERING LOCK ECU (DISCONNECT J29 ECU CONNECTOR)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
B (J29-7) - Body ground	O - Body ground	+B power supply	Always	10 to 14 V
IG2 (J29-6) - Body ground	LG - Body ground	Ignition power supply	Engine switch on (IG)	10 to 14 V
IG2 (J29-6) - Body ground	LG - Body ground	Ignition power supply	Engine switch off	Below 1 V
GND (J29-1) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms
SGND (J29-2) - Body ground	W-B - Body ground	Ground	Always	Below 1 ohms

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

Reconnect the J29 ECU connector.
Measure the voltage of the connector.

STEERING LOCK ECU (RECONNECT J29 ECU CONNECTOR)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
SLP1 (J29-4) - GND (J29-1)	R - W-B	Steering lock actuator position signal	Steering is locked	10 to 14 V
SLP1 (J29-4) - GND (J29-1)	R - 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.