On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 5: Pinpoint Tests

NB: Malfunction Indicator Lamp (MIL)

Note: If vehicle will not start, go to Pinpoint Test Step A1 .

Disconnect PCM.
If any Key On Engine Off or Continuous Memory Diagnostic Trouble Codes are present, repair before proceeding.
Measure resistance between PCM harness connector Pin 2 and PCM harness connector Pin 51 or 103.

Is resistance less than 5.0 ohms?

Yes	No
REPAIR short circuit.	REPLACE PCM (refer to Section 2 , Flash EEPROM).

Note: If vehicle will not start, go to Pinpoint Test Step A1 .

Key on, engine off.
Measure voltage from battery negative post to Ground side of the MIL fuse. Refer to the Wiring Diagram Manual for the specific location of the MIL fuse.

Is voltage greater than 10.5 volts?

Yes	No
KEY OFF. GO to NB4 .	KEY OFF. GO to NB3 .

Is voltage greater than 10.5 volts?

Yes	No
REPLACE the fuse. VERIFY repair by turning ignition key to the on position.	KEY OFF. GO to the Electrical Troubleshooting Manual to repair power distribution (to the fuse) from the Power Distribution Box.

Note: Refer to the Electrical and Vacuum Troubleshooting Manual (EVTM) for connector location.

Disconnect Instrument Cluster harness connector.
Key on, engine off.
Measure voltage of B+ circuit between the Instrument Cluster harness connector and battery negative post.

Was voltage greater than 10.5 volts?

Yes	No
KEY OFF. GO to NB5 .	REPAIR open circuit.

Disconnect PCM.
Measure resistance between PCM harness connector Pin 2 and MIL circuit at the instrument cluster connector.

Is resistance less than 5.0 ohms?

Yes	No
GO to Instrumental Cluster, Section 413-01 in the Workshop Manual to diagnose Instrument Cluster and Bulb. If OK, REPLACE PCM (refer to Section 2 , Flash EEPROM). VERIFY the repair by turning key to the ON position.	REPAIR open circuit. VERIFY repair by turning key to the ON position.