Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ECM POWER SUPPLY

Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the voltage between ECM harness connector and ground.

VOLTAGE SPECIFICATION

ECM				Voltage
+		-
Connector	Terminal	Connector	Terminal
F13	77	E10	112	Battery voltage

Fig 1: Checking Voltage Between ECM Harness Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: GO TO 3.

NO: GO TO 2.

DETECT MALFUNCTIONING PART
Check the following.
- 15 A fuse (No. 42)
- IPDM E/R harness connector F10
- Harness for open or short between ECM and battery
: Repair or replace harness or connectors.
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

Is the inspection result normal?

YES: GO TO 4.

NO: Repair or replace harness or connectors.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC CONFIRMATION PROCEDURE.
See "DTC LOGIC ".

Is the 1st trip DTC P0603 displayed again?

YES: GO TO 5.

NO: INSPECTION END
REPLACE ECM
1. Replace ECM.
2. Go to "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT: SPECIAL REPAIR REQUIREMENT ".
: INSPECTION END