Symptom Chart: Notes

WARNING: This page is about a different car, the 2013 Jaguar XJ, 2012 Jaguar XJ, 2011 Jaguar XJ, and 2010 Jaguar XJ. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM	POSSIBLE CAUSE	ACTION
Engine does not crank	Security system/Immobilizer engaged Engine Control Module (ECM) relay Battery Starting system Harness Engine seized	Check that the security system is disarmed. Check the Engine Control Module (ECM) relay operation. Check the battery condition and state of charge. For starting system tests, refer to the relevant service information. Check that the engine turns by hand.
Engine cranks, but does not fire	Low/Contaminated fuel Ignition system Fuel system Crankshaft position (CKP) sensor Harness Engine Control Module (ECM) fault	Check the fuel level and condition. For ignition system tests and fuel system tests Refer to the relevant service information. For CKP and harness tests refer to the guided diagnostic routine on the approved diagnostic system. Refer to the warranty policy and procedures manual if an Engine Control Module (ECM) is suspect.
Engine cranks and fires, but will not start	Evaporative emissions purge valve Fuel system Spark plugs Ignition coil failure(s) Harness	For purge valve tests, fuel system tests and ignition system tests, Refer to the relevant service information.
Difficult to start cold	Check coolant anti-freeze content Battery Crankshaft position (CKP) sensor Fuel system Evaporative emissions purge valve	Check the coolant condition. Check the battery condition and state of charge. For CKP sensor tests refer to the guided diagnostic routine on the approved diagnostic system. For fuel system tests and purge valve tests, refer to the relevant service information.
Difficult to start hot	Injector leak Fuel system Fuel temperature sensor Intake air temperature (IAT) sensor Mass air flow (MAF) sensor Evaporative emissions purge valve Ignition system	For injector and fuel system tests, fuel temperature sensor, IAT sensor and MAF sensor tests refer to the guided diagnostic routine on the approved diagnostic system. For purge valve tests and ignition system tests, refer to the relevant service information.
Difficult to start after hot soak (vehicle standing after engine has reached operating temperature)	Injector leak Fuel system Fuel temperature sensor IAT sensor MAF sensor Evaporative emissions purge valve Ignition system	For injector and fuel system tests, fuel temperature sensor, IAT sensor and MAF sensor tests refer to the guided diagnostic routine on the approved diagnostic system. For purge valve tests and ignition system tests, refer to the relevant service information.
Engine cranks too fast/slow	Compressions high/low Battery Starting system	Check compressions. Check the battery condition and state of charge. For starting system tests refer to the relevant service information.
Engine stalls soon after start	Breather system disconnected/restricted Engine Control Module (ECM) relay MAF sensor Ignition system Air cleaner restricted Air leakage Fuel lines Fuel rail pressure (FRP) sensor	Check the engine breather system. Check the Engine Control Module (ECM) relay operation. For MAF sensor tests refer to the guided diagnostic routine on the approved diagnostic system. For ignition system tests, refer to the relevant service information. For air intake and fuel line information, refer to the relevant service information. For FRP sensor tests refer to the guided diagnostic routine on the approved diagnostic system.
Engine stalls on overrun	Engine Control Module (ECM) relay Throttle position (Throttle position) sensors	Check the Engine Control Module (ECM) relay operation. For Throttle position sensor tests refer to the guided diagnostic routine on the approved diagnostic system.
Engine stalls at steady speed	Engine Control Module (ECM) relay CKP sensor Throttle position sensors	Check the Engine Control Module (ECM) relay operation. For CKP sensor and Throttle position sensor tests refer to the guided diagnostic routine on the approved diagnostic system.
Engine stalls with speed control enabled	Engine Control Module (ECM) relay	Check the Engine Control Module (ECM) relay operation.
Engine stalls when maneuvering	Engine Control Module (ECM) relay Throttle position sensors Additional engine loads (PAS, air conditioning, etc.) Transmission malfunction CAN malfunction	Check the Engine Control Module (ECM) relay operation. For Throttle position sensor tests refer to the guided diagnostic routine on the approved diagnostic system. For accessory drive and transmission information, refer to the relevant service information. Check for CAN fault codes.
Engine hesitates/poor acceleration	Fuel pump Fuel lines Injector leak Fuel pressure Air leakage Throttle position sensors Throttle motor Ignition system HO2 sensors Transmission malfunction Restricted pedal travel (carpet, etc.) Accelerator pedal position (Throttle position) sensor	For fuel pump and fuel line information and intake system checks, refer to the relevant service information. For Throttle position sensor and throttle motor tests refer to the guided diagnostic routine on the approved diagnostic system. For ignition system tests, refer to the relevant service information. Check for DTCs relating to HO2 sensors, refer to the DTC index. For transmission information, refer to the relevant service information. Check the accelerator pedal travel. For Throttle position sensor tests refer to the guided diagnostic routine on the approved diagnostic system.
Engine backfires	Fuel pump Fuel lines Air leakage MAF sensor HO2 sensors Ignition system Throttle position sensor	For fuel pump and fuel line and intake system information, refer to the relevant service information. For MAF sensor tests refer to the guided diagnostic routine on the approved diagnostic system. Check for DTCs relating to HO2 sensors, refer to the DTC index. For ignition system tests, refer to the relevant service information. For Throttle position sensor tests refer to the guided diagnostic routine on the approved diagnostic system.
Engine surges	Fuel pump Fuel lines MAF sensor Harness Throttle position sensors Throttle motor Ignition system	For fuel pump and fuel line information, refer to the relevant service information. For MAF sensor, throttle position sensor and throttle motor tests refer to the guided diagnostic routine on the approved diagnostic system. For ignition system tests, refer to the relevant service information.
Engine detonates/knocks	Knock sensor circuit malfunction Fuel pump Fuel lines Fuel quality FRP sensor MAF sensor HO2 sensor(s) Air leakage Barometric sensor malfunction (internal Engine Control Module (ECM) fault)	For Knock sensor circuit tests refer to the guided diagnostic routine on the approved diagnostic system. For fuel pump and fuel line information, refer to the relevant service information. For FRP sensor and MAF sensor tests refer to the guided diagnostic routine on the approved diagnostic system. Check for DTCs relating to HO2 sensors, refer to the DTC index. For intake system, refer to the relevant service information. Refer to the warranty policy and procedures manual if an Engine Control Module (ECM) is suspect.
No throttle response	Throttle position sensor malfunction Throttle position sensors Throttle motor	For Throttle position sensor, Throttle position sensor and throttle motor tests refer to the guided diagnostic routine on the approved diagnostic system.
Speed control inhibited or disabled	Default mode enabled Speed control switch(es) Throttle position sensors CAN fault	Check message center for default message. For speed control switch information, refer to the relevant service information. For Throttle position sensor tests refer to the guided diagnostic routine on the approved diagnostic system. Check for CAN fault codes.
Poor throttle response	Throttle position sensor malfunction Throttle position sensors ECT sensor MAF sensor Transmission malfunction Traction control event Air leakage Breather system disconnected/restricted	For Throttle position sensor, Throttle position sensor, ECT sensor and MAF sensor tests refer to the guided diagnostic routine on the approved diagnostic system. For transmission information, intake system and breather system checks, refer to the relevant service information.
Engine defaults, warning lamp and messages. refer to the owner handbook	Throttle position sensors MAF sensor ECT sensor Harness	For Throttle position sensor, MAF sensor and ECT sensor tests refer to the guided diagnostic routine on the approved diagnostic system.

NOTE: Check the Powertrain control module (PCM) for related engine system DTCs and refer to relevant DTC index. If DTCs relating to any subsystem are present then these must be addressed before continuing with this pinpoint test e.g. Ignition system (including crank shaft sensor), Fuelling system (includes fuel system too lean/rich)