Symptom Chart

SYMPTOM	POSSIBLE CAUSES	ACTION
Engine cranks, but does not start	Engine system fault Engine breather system disconnected/restricted	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Check the integrity of the engine breather system
Engine cranks and fires, but will not start	Engine system fault Evaporative emissions system fault Fuel system fault Spark plugs fouled/worn HT short to ground (tracking) check rubber boots for cracks/damage	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Refer to the relevant portion of the service information and test the evaporative emissions system Refer to the relevant portion of the service information and test the fuel system Check the spark plugs for cracks, damage, carbon build up, wet fouling, electrode gap too large/small, center electrode condition, ground electrode condition Check the ignition coil rubber boots for cracks/damage
Engine difficult to start (cold engine)	Engine system fault Engine coolant level and specific gravity Battery/charging system fault Fuel system fault Evaporative emissions system fault	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Check the coolant level and specific gravity Refer to the relevant portion of the service information and test the battery and charging system Refer to the relevant portion of the service information and test the fuel system refer to the relevant portion of the service information and test the evaporative emissions system
Engine difficult to start (warm/hot engine)	Engine system fault Injector(s) leaking Evaporative emissions system fault Fuel system fault	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Check the injectors for leaks Refer to the relevant portion of the service information and test the evaporative emissions system Refer to the relevant portion of the service information and test the fuel system
Engine difficult to start after hot soak (vehicle standing, engine off, after engine has reached operating temperature)	Engine system fault Injector(s) leaking Evaporative emissions system fault Fuel system fault	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Check the injectors for leaks Refer to the relevant portion of the service information and test the evaporative emissions system Refer to the relevant portion of the service information and test the fuel system
Engine stalls soon after start	Engine system fault Engine breather system disconnected/restricted Intake pipe restricted/blocked Air filter element restricted/blocked Intake pipe disconnected/damaged after the air cleaner Fuel system fault	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Check the integrity of the engine breather system Check the intake pipe for restrictions and blockages Install a new air filter element as necessary Check the intake system for correct installation and damage Refer to the relevant portion of the service information and test the fuel system
Engine hesitates/poor acceleration	Engine system fault Fuel system fault Injector(s) leaking Intake pipe disconnected/damaged after the air cleaner Transmission fault Accelerator pedal movement restricted (carpet, mats, etc)	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Refer to the relevant portion of the service information and test the fuel system Check the injectors for leaks Check the intake system for correct installation and damage Using the manufacturer approved diagnostic system, check the transmission control module for related DTCs and refer to the relevant DTC index Check that the accelerator pedal is free from restriction
Engine backfires	Engine system fault Fuel system fault Intake pipe disconnected/damaged after the air cleaner Variable camshaft timing system stuck active	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Refer to the relevant portion of the service information and test the fuel system Check the intake system for correct installation and damage Check the operation of the variable camshaft timing system
Engine surges	Engine system fault Fuel system fault	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Refer to the relevant portion of the service information and test the fuel system
Engine detonates/knocks	Engine system fault Fuel system fault Intake pipe disconnected/damaged after the air cleaner Variable camshaft timing system stuck active	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Refer to the relevant portion of the service information and test the fuel system Check the intake system for correct installation and damage Check the operation of the variable camshaft timing system
No throttle response	Engine system fault	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index
Throttle response poor	Engine system fault Engine breather system disconnected/restricted Transmission fault Dynamic stability control event Intake pipe disconnected/damaged after the air cleaner	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index Check the integrity of the engine breather system Using the manufacturer approved diagnostic system, check the transmission control module for related DTCs and refer to the relevant DTC index No fault - Accelerator pedal response may be temporarily reduced or inhibited when the dynamic stability control is active Check the intake system for correct installation and damage