Diagnosis Procedure

CHECK ECM POWER SUPPLY

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the voltage between ECM harness connector terminals.

VOLTAGE SPECIFICATION

ECM				Voltage
+		-
Connector	Terminal	Connector	Terminal
E80	156	E80	175	Battery voltage

Is the inspection result normal?

YES: GO TO 3.

NO: GO TO 2.

DETECT MALFUNCTIONING PART
Check the following.
- 20 A fuse (No. 43)
- Harness for open or short between ECM and battery
- Loose or poor connection for each connector and harness
  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
Replace ECM.

INSPECTION END