No.2 MODE CHANGE BETWEEN AUTO AND 4WD ON IS NOT PERFORMED NORMALLY

id030300800800

Possible Cause

• 4WD lock switch malfunction

• 4WD lock solenoid sticking

• RBC unit malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

INSPECT 4WD LOCK SYSTEM FOR POWER SUPPLY

•  Turn the ignition switch off.

•  Disconnect the 4WD lock switch connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at terminal B of the 4WD lock switch vehicle-side connector.

•  Is the voltage 10 V or more?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part.

2

INSPECT 4WD LOCK SWITCH

•  Inspect the 4WD lock switch.

•  Is the 4WD lock switch normal?

Yes

Go to the next step.

No

Replace the 4WD lock switch.

3

INSPECT 4WD RELAY COIL SIDE POWER SUPPLY WIRING HARNESS FOR OPEN CIRCUIT

•  Turn the ignition switch off.

•  Connect the 4WD lock switch.

•  Disconnect the 4WD relay connector.

•  Turn the ignition switch to the ON position.

•  Set the 4WD lock switch ON (LOCK).

•  Measure the voltage at terminal A of the 4WD relay vehicle-side connector.

•  Is the voltage 10 V or more?

Yes

Go to the next step.

No

Repair or replace the wiring harness between 4WD lock switch terminal A and 4WD relay terminal A.

4

INSPECT 4WD RELAY COIL SIDE GROUND WIRING HARNESS FOR OPEN CIRCUIT

•  Turn the ignition switch to the ON position.

•  Measure the resistance between terminal B of the 4WD relay vehicle-side connector and body ground.

•  Is the resistance less than 5 ohms?

Yes

Go to the next step.

No

Repair or replace any malfunction.

5

INSPECT 4WD RELAY SWITCH SIDE GROUND WIRING HARNESS FOR OPEN CIRCUIT

•  Turn the ignition switch off.

•  Measure the voltage between terminal D of the 4WD relay vehicle-side connector and body ground.

•  Is the voltage 10 V or more?

Yes

Go to the next step.

No

Repair or replace the wiring harness between CJB terminal B and 4WD relay terminal D.

6

INSPECT 4WD RELAY

•  Inspect the 4WD relay.

•  Is the 4WD relay normal?

Yes

Go to the next step.

No

Replace the 4WD relay.

7

INSPECT 4WD LOCK SOLENOID POWER SUPPLY SYSTEM WIRING HARNESS FOR OPEN CIRCUIT

•  Turn the ignition switch off.

•  Disconnect the 4WD lock solenoid connector.

•  Measure the resistance between terminal C of the 4WD relay vehicle-side connector and terminal B of the 4WD lock solenoid vehicle-side wiring harness.

•  Is the resistance less than 5 ohms?

Yes

Go to the next step.

No

Repair or replace any malfunction.

8

INSPECT 4WD LOCK SOLENOID GROUND WIRING HARNESS FOR OPEN CIRCUIT

•  Measure the resistance between terminal A of the 4WD lock solenoid vehicle-side connector and ground.

•  Is the resistance less than 5 ohms?

Yes

Go to the next step.

No

Repair or replace any malfunctioning.

9

INSPECT CONNECTORS FOR CONNECTION

•  Turn the ignition switch off.

•  Inspect the pin connection of the following connectors.

―  4WD lock switch

―  4WD relay

―  4WD lock solenoid

•  Is there any poor connection or corrosion?

Yes

Repair or replace any malfunction.

No

Replace the RBC unit.

STEP	INSPECTION		ACTION
1	INSPECT 4WD LOCK SYSTEM FOR POWER SUPPLY • Turn the ignition switch off. • Disconnect the 4WD lock switch connector. • Turn the ignition switch to the ON position. • Measure the voltage at terminal B of the 4WD lock switch vehicle-side connector. • Is the voltage 10 V or more?	Yes	Go to the next step.
1		No	Repair or replace the malfunctioning part.
2	INSPECT 4WD LOCK SWITCH • Inspect the 4WD lock switch. • Is the 4WD lock switch normal?	Yes	Go to the next step.
2		No	Replace the 4WD lock switch.
3	INSPECT 4WD RELAY COIL SIDE POWER SUPPLY WIRING HARNESS FOR OPEN CIRCUIT • Turn the ignition switch off. • Connect the 4WD lock switch. • Disconnect the 4WD relay connector. • Turn the ignition switch to the ON position. • Set the 4WD lock switch ON (LOCK). • Measure the voltage at terminal A of the 4WD relay vehicle-side connector. • Is the voltage 10 V or more?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness between 4WD lock switch terminal A and 4WD relay terminal A.
4	INSPECT 4WD RELAY COIL SIDE GROUND WIRING HARNESS FOR OPEN CIRCUIT • Turn the ignition switch to the ON position. • Measure the resistance between terminal B of the 4WD relay vehicle-side connector and body ground. • Is the resistance less than 5 ohms?	Yes	Go to the next step.
4		No	Repair or replace any malfunction.
5	INSPECT 4WD RELAY SWITCH SIDE GROUND WIRING HARNESS FOR OPEN CIRCUIT • Turn the ignition switch off. • Measure the voltage between terminal D of the 4WD relay vehicle-side connector and body ground. • Is the voltage 10 V or more?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness between CJB terminal B and 4WD relay terminal D.
6	INSPECT 4WD RELAY • Inspect the 4WD relay. • Is the 4WD relay normal?	Yes	Go to the next step.
6		No	Replace the 4WD relay.
7	INSPECT 4WD LOCK SOLENOID POWER SUPPLY SYSTEM WIRING HARNESS FOR OPEN CIRCUIT • Turn the ignition switch off. • Disconnect the 4WD lock solenoid connector. • Measure the resistance between terminal C of the 4WD relay vehicle-side connector and terminal B of the 4WD lock solenoid vehicle-side wiring harness. • Is the resistance less than 5 ohms?	Yes	Go to the next step.
7		No	Repair or replace any malfunction.
8	INSPECT 4WD LOCK SOLENOID GROUND WIRING HARNESS FOR OPEN CIRCUIT • Measure the resistance between terminal A of the 4WD lock solenoid vehicle-side connector and ground. • Is the resistance less than 5 ohms?	Yes	Go to the next step.
8		No	Repair or replace any malfunctioning.
9	INSPECT CONNECTORS FOR CONNECTION • Turn the ignition switch off. • Inspect the pin connection of the following connectors. ― 4WD lock switch ― 4WD relay ― 4WD lock solenoid • Is there any poor connection or corrosion?	Yes	Repair or replace any malfunction.
9		No	Replace the RBC unit.