Instrument Cluster Test 17A - Check Engine Light
NOTE:
Perform INSTRUMENT CLUSTER TEST 4A
before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION
For wiring diagrams, refer to WIRING DIAGRAMS
. Perform, after each repair, TEST VER-1A - VERIFICATION PROCEDURE
.
CAUTION:
Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
- Start engine. Using scan tool, select vehicle status monitor under body monitor. Read CHECK ENGINE LAMP STATUS. If check engine lamp status is not ON, go to next step. If check engine lamp status is ON, see TESTS W/CODES article in the ENGINE PERFORMANCE Section.
- Turn ignition switch from OFF position to ON/RUN position. If check engine light does not illuminate, go to next step. If check engine light illuminates and then goes off, system is operating properly.
- Turn ignition switch to UNLOCK position. Using scan tool, actuate ALL LAMPS. If check engine light does not illuminate, go to next step. If check engine light illuminates, replace BCM.
- Turn ignition off. Disconnect instrument cluster. Ensure connectors are clean and not damaged. See Figure in INSTRUMENT CLUSTER TEST 8A. Remove and inspect check engine light bulb. Ensure bulb socket is clean and not damaged. If bulb is defective, replace bulb. If bulb is okay, repair or replace instrument cluster as necessary.