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:
- Even though test mode connector is disconnected, 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.

Connector & terminal (B135) No.14 - Chassis ground:

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

CHECK: Is resistance less than 5 ohm?

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

NO: Replace ECM.