Diagnostic Procedure
WARNING: This page is about a different variant/trim than selected.
- Using scan tool, check stoplight switch data values. See SCAN TOOL DATA under SELF-DIAGNOSTIC SYSTEM. Note scan tool data values, then go to next step.
- Test stoplight switch. See STOPLIGHT SWITCH under COMPONENT TESTS. Replace as necessary. See STOPLIGHT SWITCH under REMOVAL & INSTALLATION. If stoplight switch tests okay, check electrical connections and wiring between stoplight switch and PCM. See WIRING DIAGRAMS . Repair as necessary. If connections and wiring check okay and symptom is still present, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.