Operation CHARM: Car repair manuals for everyone.

Engine Does Not Start

FAULT INDICATIONS
Engine cranks normally but will not start. Symptom is permanent (not intermittent).

FAULT TRACING CONDITIONS
Before fault tracing, ensure that:
^ No diagnostic trouble codes are present,
^ The engine cranks normally (starter motor operates), and
^ The engine is mechanically sound (timing belt, compression, etc.).
^ All fuses are clean and intact.

FUEL PUMP
^ Open circuit in fuel pump relay wiring (supply, ground, or signal).
^ Fuel pump relay signal lead short circuited to ground or power supply.
^ Open circuit in fuel pump power supply or ground.
^ Excessive connector resistance at relay or fuel pump.
^ Bad fuel pump or fuel pump relay.

INJECTORS
^ Open circuit in injection control unit power/ground.
^ Short or Open circuit in vehicle speed sensor lead.
^ Short or Open circuit to injector ground or power supply.
^ Faulty injector(s).

MASS AIR FLOW SENSOR
^ Open circuit in sensor supply lead, signal lead, power ground or signal ground.
^ Short circuit in sensor ground or signal leads.
^ Poor sensor connection (excessive resistance).
^ Faulty mass air flow sensor.

FUEL PRESSURE
^ Incorrect fuel pressure.