Test Procedure
WARNING: This page is about a different variant/trim than selected.
- NB1 MALFUNCTION INDICATOR LAMP ALWAYS ON (NO DTCS PRESENT)
Does the vehicle start?
Yes No GO to NB2. Concern is elsewhere. RETURN to SYMPTOM CHARTS - GASOLINE MODELS for further direction. - NB2 CHECK THE MIL CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS
- Key in OFF position.
- PCM connector disconnected.
- Measure the resistance between:
(+) PCM Connector, Harness Side (-) Vehicle Battery MIL Negative terminal
Is the resistance greater than 10K ohms?
Yes No INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . REPAIR the short circuit to GND. - NB3 MALFUNCTION INDICATOR LAMP (MIL) NEVER ON
Does the vehicle start?
Yes No GO to NB4. Concern is elsewhere. RETURN to SYMPTOM CHARTS - GASOLINE MODELS for further direction. - NB4 MIL HARNESS CHECK
- Key in OFF position.
- PCM connector disconnected.
- Key in ON position.
- Connect a 5 amp fused jumper wire between the following:
Point A PCM Connector, Harness Side Point B MIL Ground - Remove the jumper wire(s)
Does the MIL Illuminate when grounded?
Yes No INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . GO to NB5. - NB5 CHECK FOR AN OPEN MIL CIRCUIT BETWEEN THE PCM AND INSTRUMENT CLUSTER
- Key in OFF position.
- Disconnect the instrument cluster.
- Measure the resistance between:
(+) PCM Connector, Harness Side (-) IC Connector, Harness Side MIL MIL
Is the resistance less than 5 ohms?
Yes No REFER to INSTRUMENT CLUSTER to diagnose the MIL and its circuitry. REPAIR the open circuit.
VERIFY the repair by turning the key to the ON position.