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CHECK ENGINE Warning Light

  1. Disconnect Main Instrument Unit (MIU) 20-pin connector at rear of instrument cluster. See Figure . Connect test light between 20-pin connector terminal No. 8 (Yellow/Green wire) and battery positive voltage. Turn ignition on. Using Tech 1 scan tool, attempt to activate CHECK ENGINE light. If test light comes on, replace bulb. After repair, go to next step. If test light does not come on, repair open circuit in Yellow/Green wire between MIU 20-pin connector terminal No. 8 and Trionic module. Trionic module is located under right side of instrument panel. After repair, go to step  3 .
  2. Clear DTCs. Perform a functional test of CHECK ENGINE light. If CHECK ENGINE light functions, system is okay. If CHECK ENGINE light does not function, replace MIU ECU. See ELECTRONIC CONTROL UNIT (ECU)  under REMOVAL & INSTALLATION.
  3. Clear DTCs. Using scan tool, perform a functional test of Trionic system. If a fault is still present in Trionic system, replace Trionic module. See TRIONIC MODULE  under REMOVAL & INSTALLATION.
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