Visual Inspection Chart

WARNING: This page is about a different car, the 1998 Jaguar XK8 and 1997 Jaguar XK8. However, it is still accessible from the selected car via links, so may be relevant.

VISUAL INSPECTION CHART

Mechanical	Electrical
Engine oil level Cooling system coolant level Fuel Contamination Throttle body Poly-vee belt	Fuses. Wiring harness Electrical connector(s) Sensor(s) Engine control module (ECM) Relay date codes. If the date on the relay is between R6 k1 and R6 k8, replace the relay

Verify the following systems are working correctly:
- Air intake system
- Cooling system
- Charging system
- Fuel charging system
If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
Where the Jaguar approved diagnostic system is available, complete the S93 report before clearing any or all fault codes from the vehicle.
NOTE: If a DTC cannot be cleared, then there is a permanent fault present that flags again as soon as it is cleared. (The exception to this is P1260, which will only clear following an ignition OFF/ON cycle after rectification.)
If the cause is not visually evident and the Jaguar approved diagnostic system is not available, use a fault code reader to retrieve the fault codes before proceeding to the DIAGNOSTIC TROUBLE CODE (DTC) INDEX , or the SYMPTOM CHART if no DTCs are set.
NOTE: If the DTC flagged was not present for two or more consecutive cycles, it is classed as temporary, and will be deleted following three cycles during which no fault was present. This could result in a reported warning light/message with no stored DTCs. If a fault is present for three consecutive cycles, the DTC becomes permanent, and will remain in the module's memory for 40 drive cycles. (A cycle is an ignition OFF/ON, which will occur during the owner's normal use of the vehicle. No action on the part of the technician is necessary to perform this cycle. A drive cycle is a series of conditions needed to make the on-board diagnostic routine run, and may need a specific action on the part of the technician. See PERFORMING DRIVE CYCLE for drive cycle routines.
Using the Jaguar approved diagnostic system where available, and a scan tool where not, check the freeze frame data for information on the conditions applicable when the fault was flagged. The format of this will vary, depending on the tool used, but can provide information useful to the technician in diagnosing the fault.

CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00.

NOTE: When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.

NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

SYMPTOM CHART

Symptom	Possible source	Action
Engine cranks, but does not fire	Security system/Immobilizer engaged Harness Fuel system ECM fault	Possible security system failure. Check fuel system pressure, refer to FUEL SYSTEM PRESSURE CHECK . For ECM tests, refer to ELECTRONIC ENGINE CONTROLS .
Engine cranks and fires, but will not start	Fuel pump relay Fuel pump Cylinder compression loss (short-term. Refer to TSB 303-52 ) Engine coolant temperature (ECT) sensor Spark plugs fouled Ignition coil failure(s) HT short to ground (tracking) check rubber boots for cracks/damage	For fuel pump relay tests, refer to ELECTRONIC ENGINE CONTROLS . Check fuel pressure, refer to FUEL SYSTEM PRESSURE CHECK For cylinder compression loss (short-term. Refer to TSB 303-52 ). For ECT sensor tests, refer to ELECTRONIC ENGINE CONTROLS . For ignition system tests, REFER to PINPOINT TESTS .
Difficult to start cold	Battery Fuel pump Cylinder compression loss (short-term. Refer to TSB 303-52 ) Spark plugs fouled	Check battery condition. Check fuel pressure. refer to FUEL SYSTEM PRESSURE CHECK . For cylinder compression loss (short-term. Refer to TSB 303-52 ). For ignition system tests, REFER to PINPOINT TESTS .
Difficult to start hot	Rochester valve (Mexico only) Injector leak Purge valve Fuel pump Engine coolant temperature (ECT) sensor	For Rochester valve test, refer to ELECTRONIC ENGINE CONTROLS . For injector leak test, REFER to TSB 303-39 . Check fuel pressure. For evaporative emissions components, refer to EVAPORATIVE EMISSIONS . For ECT sensor tests, refer to ELECTRONIC ENGINE CONTROLS .
Difficult to start after hot soak (vehicle standing after engine has reached operating temperature)	Rochester valve (Mexico only) Injector leak Purge valve Fuel pump Engine coolant temperature (ECT) sensor	For Rochester valve test, refer to ELECTRONIC ENGINE CONTROLS . For injector leak test, REFER to TSB 303-39 . Check fuel pressure, refer to FUEL SYSTEM PRESSURE CHECK . For evaporative emissions components, refer to EVAPORATIVE EMISSIONS . For ECT sensor tests, refer to ELECTRONIC ENGINE CONTROLS .
Engine stalls soon after start	Fuel pump relay ECM relay Harness damage Fuel pump Engine coolant temperature (ECT) sensor Fuel lines Fuel pressure regulator Air leakage	Check for DTCS. For fuel pump and ECM relay tests, refer to ELECTRONIC ENGINE CONTROLS . Check fuel pressure. refer to FUEL SYSTEM PRESSURE CHECK . For ECT sensor tests, refer to ELECTRONIC ENGINE CONTROLS . For fuel line information, refer to FUEL TANK & LINES . For fuel pressure regulator, refer to FUEL CHARGING & CONTROLS . Check air intake system for leaks.
Engine hesitates/poor acceleration	Fuel pump Air leakage Fuel pressure regulator Fuel lines Harness damage Throttle sensors Throttle motor Spark plugs fouled Ignition coil failure(s) HT short to ground (tracking) check rubber boots for cracks/damage	Check fuel pressure, refer to FUEL SYSTEM PRESSURE CHECK . Check air intake system for leaks. For fuel pressure regulator, refer to FUEL CHARGING & CONTROLS . For fuel lines information, refer to FUEL TANK & LINES . For throttle position sensor and throttle motor relay tests, refer to ELECTRONIC ENGINE CONTROLS . For ignition system tests, REFER to PINPOINT TESTS .
Engine backfires	Fuel pump Fuel lines Air leakage Mass air flow (MAF) sensor Spark plugs HT short to ground (tracking) check rubber boots for cracks/damage	Check fuel pressure, refer to FUEL SYSTEM PRESSURE CHECK . For fuel pump and lines, refer to FUEL TANK & LINES . Check air intake system for leaks. For MAF sensor tests, refer to ELECTRONIC ENGINE CONTROLS . For ignition system tests, REFER to PINPOINT TESTS .
Engine surges	Air leakage Fuel pump Fuel lines Mass air flow (MAF) sensor Harness damage Throttle sensors Throttle motor Spark plugs HT short to ground (tracking) check rubber boots for cracks/damage	Check air intake system for leaks. Check fuel pressure, refer to FUEL SYSTEM PRESSURE CHECK . For fuel pump and lines, refer to FUEL TANK & LINES . For MAF sensor, throttle position sensor and throttle motor relay tests, refer to ELECTRONIC ENGINE CONTROLS . For ignition system tests, REFER to PINPOINT TESTS .
Engine detonates/knocks	Fuel lines Fuel pressure regulator Air leakage Mass air flow (MAF) sensor Oxygen sensors Fuel pump	For fuel lines, refer to FUEL TANK & LINES . For fuel pressure regulator, refer to FUEL CHARGING & CONTROLS . Check air intake system for leaks. For MAF sensor and oxygen sensor tests, refer to ELECTRONIC ENGINE CONTROLS . Check fuel pressure, refer to FUEL SYSTEM PRESSURE CHECK .
No throttle response	Throttle sensors Throttle motor	For throttle position sensor tests, throttle motor relay tests, refer to ELECTRONIC ENGINE CONTROLS .
Poor throttle response	Throttle sensors Throttle motor Air leakage Mass air flow (MAF) sensor	For throttle position sensor and throttle motor relay tests, refer to ELECTRONIC ENGINE CONTROLS . Check air intake system for leaks. For MAF sensor tests, refer to ELECTRONIC ENGINE CONTROLS .