Engine Controls - Tests W/Codes - Testing: Self-Diagnostics

CAUTION: Ensure ignition is off before disconnecting harness connector from any component or control module. If PCM replacement is instructed in following testing, always ensure PCM connectors and ground circuits are okay. If either are suspect, repair and repeat testing to confirm PCM malfunction.

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION in TESTS W/CODES - INTRODUCTION article. For wiring diagram, see WIRING DIAGRAMS article. Always perform applicable drive cycle test after repair is performed to verify if DTC is reset.

NOTE: For following tests, use of New Generation Star (NGS) tester is recommended. NGS tester is referred to as scan tool. For more information, see TESTS W/CODES - INTRODUCTION article.