Diagnosis Procedure

WARNING: This page is about a different car, the 2008 Infiniti EX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK POWER SUPPLY

Turn the ignition switch OFF.
Disconnect power steering control unit harness connector.

Check voltage between power steering control unit harness connector and ground.

TERMINALS VOLTAGE REFERENCE

Power steering control unit		-	Voltage
Connector	Terminal	-	Voltage
M108	3	Ground	0 V

Turn the ignition switch ON.
CAUTION: Never start the engine.
Check voltage between power steering control unit harness connector and ground.

TERMINALS VOLTAGE REFERENCE

Power steering control unit		-	Voltage
Connector	Terminal	-	Voltage
M108	3	Ground	Battery voltage

Is the inspection result normal?

YES: GO TO 2.

NO: Check the following. If any items are damaged, repair or replace damaged parts.

10A fuses (#45) open

Harness for short or open between ignition switch and power steering control unit harness connector No. 3 terminal.
Ignition switch. Refer to REMOVAL AND INSTALLATION .

CHECK GROUND CIRCUIT

Turn the ignition switch OFF.
Check continuity between power steering control unit harness connector and ground.

TERMINALS CONTINUITY REFERENCE TABLE

Power steering control unit		-	Continuity
Connector	Terminal	-	Continuity
M108	6	Ground	Existed

Is the inspection result normal?

YES: GO TO 3.

NO: Repair open circuit or short to power in harness or connectors.

CHECK TERMINALS AND HARNESS CONNECTORS
Check power steering control unit pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

YES: INSPECTION END

NO: Repair or replace damaged parts.