Check MIL Remains Blinking at a Cycle of 3 Hz

D:CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) REMAINS BLINKING AT A CYCLE OF 3 Hz.

DIAGNOSIS:
- Test mode connector circuit is shorted.

TROUBLE SYMPTOM:
- MIL blinks at a cycle of 3 Hz when ignition switch is turned to ON.




WIRING DIAGRAM

7D1: CHECK TEST MODE CONNECTOR.
1. Disconnect test mode connector.
2. Turn ignition switch to ON.

CHECK: Does MIL flash on and off?

YES: Go to step 7D2.

NO: System is in good order.

NOTE: MIL blinks at a cycle of 3 Hz when test mode connector is connected.

7D2: CHECK HARNESS BETWEEN ECM CONNECTOR AND ENGINE GROUNDING TERMINAL.
1. Turn ignition switch to OFF.
2. Disconnect connector from ECM.




3. Measure resistance of harness between ECM connector and chassis ground.

CHECK: Is resistance less than 5 Ohms?

YES: Repair short circuit in harness between ECM and test mode connector.

NO: Replace ECM.