NB: Malfunction Indicator Lamp (MIL)

NB: Introduction See: NB: Malfunction Indicator Lamp (MIL) - Introduction

NB1 MALFUNCTION INDICATOR LAMP (MIL) ALWAYS ON: CHECK MIL CIRCUIT FOR SHORTS TO GROUND IN HARNESS

Note: If vehicle will not start, GO to A1 See: Diagnostic Trouble Code Tests and Associated Procedures\SECTION 5: Pinpoint Tests\A: No Start - Pinpoint Test.

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

Is resistance greater than 10,000 ohms?
Yes

• REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) See: Programming and Relearning\Flash Electrically Eraseable Programmable Read Only Memory - Flash EEPROM).

No

• REPAIR short circuit.

NB2 MALFUNCTION INDICATOR LAMP (MIL) NEVER ON

Note: If vehicle will not start, GO to A1 See: Diagnostic Trouble Code Tests and Associated Procedures\SECTION 5: Pinpoint Tests\A: No Start - Pinpoint Test.

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

Is voltage greater than 10.5 volts?
Yes

• KEY OFF. GO to NB4

.

No

• KEY OFF. GO to NB3

.

NB3 CHECK B+ VOLTAGE TO FUSE

• Key on, engine off.
• Measure voltage from battery negative post to B+ side of the fuse.

Is voltage greater than 10.5 volts?
Yes

• REPLACE the fuse. VERIFY repair by turning ignition key to the

on position.

No

• KEY OFF. REFER to the Wiring Diagrams to repair power distribution

(to the fuse) from the Power Distribution Box.

NB4 CHECK VOLTAGE ON THE B+ CIRCUIT

Note: Refer to the Wiring Diagrams 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

• KEY OFF. GO to NB5

.

No

• REPAIR open circuit.

NB5 CHECK FOR OPEN MIL CIRCUIT BETWEEN PCM AND INSTRUMENT CLUSTER

• 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

• REFER to Instrument Panel, Gauges and Warning Indicators to diagnose Instrument Cluster and Bulb. If OK, REPLACE PCM (refer

to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) See: Programming and Relearning\Flash Electrically Eraseable Programmable Read Only Memory - Flash EEPROM).
VERIFY the repair by turning key to the ON position.

No

• REPAIR open circuit. VERIFY repair by turning key to the ON

position.