Service Engine Soon

The instrument panel cluster (IPC) illuminates the malfunction indicator lamp control (MIL) telltale when the engine control module (ECM) detects a malfunction in the engine emission system. The MIL indicates that an emission related malfunction has occurred and vehicle service is required. The MIL telltale is hardwired to the ECM and the ECM will ground the MIL control circuit when it wants the indicator illuminated in the IPC.