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Engine Management – V6 – Diagnostics Page 6C1-2–26
5.4 Cranks But Does Not Run Definition The engine cranks normally but does not start. Checks Actions Preliminary • Perform the preliminary checks. Refer to 4.3 Preliminary Checks in this Section. • Check the immobiliser system for correct operation. Refer to 11A Immobiliser. Sensor / System • Check the engine coolant temperature (ECT) sensor for an incorrect value. • Check the mass air flow (MAF) sensor installation. Incorrect installation of the • Check for a dirty starter motor commutator or brushes that can mask the Fuel System • Check the fuel system for the following fault conditions. Refer to 6C Fuel System • restricted fuel filter, • incorrect fuel pressure, • contaminated fuel, and • incorrect fuel pump relay operation. • Check the operation of the fuel injectors. Refer to 6C1-3 Engine Management – Ignition System • Inspect for moisture or corrosion around the spark plug / ignition coil area. • Test the ignition coil voltage output. Refer to 6C1-3 Engine Management – V6 – • Remove and inspect the spark plugs. Refer to 6C1-3 Engine Management – V6 – N O T E If the spark plugs are fouled, determine the cause of the fouling before Check for loose ignition coil ground circuit. Engine Mechanical • Check for excessive oil in combustion chamber. Refer to 6A1 Engine Mechanical • Check for the following engine fault conditions. Refer to 6A1 Engine Mechanical – • low compression, and • worn valve train components. When all diagnosis and repairs are completed, check the system for correct operation. |