Engine Controls - Tests W/O Codes 1.6L: Symptoms: Backfire
- Check engine mechanical condition.
- Check fuel pump circuit.
- Check fuel pressure regulator.
- Check fuel injector circuit.
- Check fuel evaporative emission system.
- Check Positive Crankcase Ventilation (PCV) system.
- Check Idle Air Control Valve (IACV) Air Regulator.
- Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
- Check Idle Air Control Valve-Fast Idle Control Devices (IACV-FICD) circuit.
- Check ignition timing and ignition circuit.
- Check EGR-Canister (EGRC) control solenoid and circuit.
- Check Exhaust Gas Recirculation (EGR) system.
- Check main power supply and ground circuits.
- Check camshaft position sensor circuit.
- Check mass airflow sensor circuit.
- Check front oxygen sensor circuit.
- Check engine coolant temperature sensor circuit.
- Check ECM inputs/outputs and ECM.