Symptom Chart

SYMPTOM	POSSIBLE CAUSES	ACTION
Engine cranks but does not start	Engine breathing system blocked/leaking Ignition system fault Fuel system fault Engine system fault	Check the integrity of the engine breathing system Refer to the relevant section of the service information and check the ignition system Refer to the relevant section of the service information and check the fuel system Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index
Engine cranks and fires, but will not start	Evaporative emissions system fault Ignition system fault Fuel system fault Engine system fault	Refer to the relevant section of the service information and check the evaporative emissions system Refer to the relevant section of the service information and check the ignition system Refer to the relevant section of the service information and check the fuel system Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index
Engine difficult to start (cold engine)	Battery/charging system fault Engine system fault Fuel system fault Evaporative emissions system fault	Refer to the relevant section of the service information and test the battery and charging system 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 section of the service information and check the fuel system Refer to the relevant section of the service information and check the evaporative emissions system
Engine difficult to start (warm/hot engine)	Injector(s) leaking Engine system fault Evaporative emissions system fault Fuel system fault Ignition system fault	Check the injectors for leaks 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 section of the service information and check the evaporative emissions system Refer to the relevant section of the service information and check the fuel system Refer to the relevant section of the service information and check the ignition system
Engine difficult to start after hot soak (vehicle standing, engine off, after engine has reached operating temperature)	Injector(s) leaking Engine system fault Evaporative emissions system fault Fuel system fault Ignition system fault	Check the injectors for leaks 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 section of the service information and check the evaporative emissions system Refer to the relevant section of the service information and check the fuel system Refer to the relevant section of the service information and check the ignition system
Engine stalls soon after start	Engine breathing system blocked/leaking Engine system fault Ignition system fault Intake pipe restricted/blocked Air filter element restricted/blocked Intake pipe disconnected/damaged after the air cleaner Fuel system fault	Check the integrity of the engine breathing system 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 section of the service information and check the ignition 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 section of the service information and check the fuel system
Engine hesitates/poor acceleration	Fuel system fault Injector(s) leaking Intake pipe disconnected/damaged after the air cleaner Engine system fault Accelerator pedal movement restricted (carpet, mats, etc) Ignition system fault Transmission fault	Refer to the relevant section of the service information and check 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 engine control module for related DTCs and refer to the relevant DTC index Check that the accelerator pedal is free from restriction Refer to the relevant section of the service information and check the ignition system Using the manufacturer approved diagnostic system, check the transmission control module for related DTCs and refer to the relevant DTC index
Engine backfires	Fuel system fault Intake pipe disconnected/damaged after the air cleaner Engine system fault Ignition system fault Variable camshaft timing system stuck active	Refer to the relevant section of the service information and check the fuel system Check the intake system for correct installation and 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 section of the service information and check the ignition system Check the operation of the variable camshaft timing system
Engine surges	Fuel system fault Engine system fault Ignition system fault	Refer to the relevant section of the service information and check the fuel system 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 section of the service information and check the ignition 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 section of the service information and check 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