Symptom Chart

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

Symptom	Possible Cause	Action
Engine non-start
Engine does not crank	Security system / Immobilizer engaged Engine in shut-down mode ECM relay Battery Starting system Engine seized	Check that the security system is disarmed Read DTCs and refer to DTC Index in this section for ECM relay tests Ensure the battery is in fully charged and serviceable condition For starting system tests refer to the relevant section of the service information For engine system tests refer to the relevant section of the service information
Engine cranks, but does not fire	Engine breather system disconnected/restricted Ignition system Fuel system Electronic engine controls	Ensure the engine breather system is free from restriction and is correctly installed For ignition system tests refer to the relevant section of the service information For fuel system tests refer to the relevant section of the service information Read DTCs and refer to DTC Index in this section for electronic engine control tests
Engine cranks and fires, but will not start	Evaporative emissions purge valve Fuel pump Spark plugs Ignition coil failure(s)	For purge valve tests refer to the relevant section of the service information For fuel system tests refer to the relevant section of the service information For ignition system tests refer to the relevant section of the service information
Difficult to start
Difficult cold start	Check engine coolant level/anti-freeze content Battery Electronic engine controls Exhaust Gas Recirculation (EGR) valve stuck open Fuel pump Evaporative emissions purge valve	Check the engine coolant level and condition. Refer to the relevant sections of the service information Ensure the battery is in a fully charged and serviceable condition. Refer to the battery care manual and the relevant sections of the service information Read DTCs and refer to DTC Index in this section for electronic engine control tests Refer to the relevant section of the service information and check the Exhaust Gas Recirculation (EGR) valve and associated hoses and connections For fuel system tests refer to the relevant section of the service information Refer to the relevant section of the service information and check the purge valve and associated hoses and connections
Difficult hot start	Injector leak Electronic engine controls Evaporative emissions purge valve Fuel pump Ignition system Exhaust Gas Recirculation (EGR) valve stuck open	Refer to the relevant section of the service information, carry out injector leak tests, install new injectors as necessary Read DTCs and refer to DTC Index in this section for electronic engine control tests Refer to the relevant section of the service information and check the purge valve and associated hoses and connections For fuel system tests refer to the relevant section of the service information For ignition system tests refer to the relevant section of the service information Refer to the relevant section of the service information and check the Exhaust Gas Recirculation (EGR) valve and associated hoses and connections
Difficult to start after hot soak (vehicle standing, engine off, after engine has reached operating temperature)	Injector leak Electronic engine controls Evaporative emissions purge valve Fuel pump Ignition system Exhaust Gas Recirculation (EGR) valve stuck open	Refer to the relevant section of the service information, carry out injector leak tests, install new injectors as necessary Read DTCs and refer to DTC Index in this section for electronic engine control tests Refer to the relevant section of the service information and check the purge valve and associated hoses and connections. For fuel system tests refer to the relevant section of the service information For ignition system tests refer to the relevant section of the service information Refer to the relevant section of the service information and check the Exhaust Gas Recirculation (EGR) valve and associated hoses and connections
Engine cranks too fast/slow	Compressions high/low Battery Starting system	Refer to the relevant section of the service information, carry out compression tests. Ensure the battery is in a fully charged and serviceable condition. Refer to the battery care manual and the relevant sections of the service information. For starting system tests refer to the relevant section of the service information
Engine stalls
Engine stalls soon after start	Breather system disconnected/restricted ECM relay Electronic engine controls Ignition system Air intake system restricted Air leakage Fuel lines	Ensure the engine breather system is free from restriction and is correctly installed Read DTCs and refer to DTC Index in this section for ECM relay tests Read DTCs and refer to DTC Index in this section for electronic engine control tests For ignition system tests refer to the relevant section of the service information Check for blockage in air cleaner element and air intake system Check for leakage in air intake system For fuel system tests refer to the relevant section of the service information
Engine stalls on overrun	ECM relay Throttle Position (TP) sensors	Read DTCs and refer to DTC Index in this section for ECM relay and Throttle Position (TP) sensor tests
Engine stalls at steady speed	ECM relay crankshaft position sensor TP sensors	Read DTCs and refer to DTC Index in this section for ECM relay, crankshaft position sensor, and TP sensor tests
Engine stalls with speed control enabled	ECM relay	Read DTCs and refer to DTC Index in this section for ECM relay tests
Engine stalls when maneuvering	ECM relay TP sensors Additional engine loads (PAS, air conditioning, etc) Transmission malfunction CAN malfunction	Read DTCs and refer to DTC Index in this section for ECM relay, and TP sensor tests Check for excessive loads being placed on the engine from PAS, air conditioning systems etc. Refer to the service information or transmission troubleshooting guide for transmission system tests Refer to the relevant section of the service information and the electrical wiring diagrams to perform CAN network tests
Poor driveability
Engine hesitates/poor acceleration	Fuel pressure, fuel pump, fuel lines Injector leak Air leakage Electronic engine controls Ignition system Exhaust Gas Recirculation (EGR) valve stuck Transmission malfunction Restricted pedal travel (carpet, etc)	For fuel system tests refer to the relevant section of the service information Carry out fuel injector leak tests, install new injectors as necessary Check for leakage from air intake system Read DTCs and refer to DTC Index in this section for electronic engine control tests For ignition system tests refer to the relevant section of the service information Refer to the relevant section of the service information and check the Exhaust Gas Recirculation (EGR) valve and associated hoses and connections Refer to the service information or transmission troubleshooting guide for transmission system tests Ensure accelerator pedal is free from restriction
Engine backfires	Fuel pump, fuel lines Air leakage Electronic engine controls Ignition system Sticking Variable Camshaft Timing (VCT) actuators	For fuel system tests refer to the relevant section of the service information Check for leakage from air intake system Read DTCs and refer to DTC Index in this section for electronic engine control tests For ignition system tests refer to the relevant section of the service information Read DTCs and refer to DTC Index in this section for Variable Camshaft Timing (VCT) system tests
Engine surges	Fuel pump, fuel lines Electronic engine controls Ignition system	For fuel system tests refer to the relevant section of the service information Read DTCs and refer to DTC Index in this section for electronic engine control tests For ignition system tests refer to the relevant section of the service information
Engine detonates/knocks	Electronic engine controls Fuel pump, fuel lines, fuel quality Air leakage Sticking VCT hub	Read DTCs and refer to DTC Index in this section for electronic engine control tests For fuel system tests refer to the relevant section of the service information Check for leakage from air intake system Read DTCs and refer to DTC Index in this section for VCT system tests
No throttle response	Electronic engine controls	Read DTCs and refer to DTC Index in this section for electronic engine control tests
Speed control inhibited or disabled	Default mode enabled Speed control, brake switch Electronic engine controls CAN fault	Check message center for default message, read DTCs and refer to DTC Index Refer to the relevant section of the service information for speed control, and brake switch tests Read DTCs and refer to DTC Index in this section for electronic engine control tests Refer to the relevant section of the service information and the electrical wiring diagrams to perform CAN network tests
Poor throttle response	Breather system disconnected/restricted Electronic engine controls Transmission malfunction Traction control event Air leakage	Ensure engine breather system is free from restriction and is correctly installed Read DTCs and refer to DTC Index in this section for electronic engine control tests Refer to the service information or transmission troubleshooting guide for transmission system tests Check for leakage in air intake system
Engine defaults, warning light and messages. Refer to the owner handbook	Electronic engine controls	Read DTCs and refer to DTC Index in this section for electronic engine control tests