Diagnosis Procedure

CHECK ECM POWER SUPPLY

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the voltage between ECM harness connector terminals as per the following.

ECM				Voltage
+		-
Connector	Terminal	Connector	Terminal
F102	93	M107	128	Battery voltage

Is the inspection result normal?

YES: GO TO 3.

NO: GO TO 2.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E20, F40
- 15 A fuse (No. 51)
- IPDM E/R harness connector E5
- 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 "WORK PROCEDURE ".
  : INSPECTION END