Visual Inspection Chart

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) Transmission control module Check spark plug type. Only resisted plugs should be fitted. Refer to SPECIFICATIONS section for gap 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 Chart, 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 ON/OFF, 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.

PROBLEM SYMPTOM CHART

Symptom (general)	Symptom (specific)	Possible Source	Action
Non-Start	Engine does not crank	Starter relay ECM relay Battery Park/Neutral switch Starting system Harness damage Engine siezed	Check relay dates. Check for DTCS. For starting system, refer to STARTING SYSTEM . For ECM relay tests, GO to Pinpoint Test G270236P33 . Check battery and charging system, refer to GENERATORS & REGULATORS . For Park/Neutral tests, GO to Pinpoint Test G270236P32 . For engine information, refer to 4.0L V8
	Engine cranks, but does not fire	Security system/Immobiliser engaged Throttle contaminated Harness damage Fuel pump relay Fuel system Refer to any applicable TSBs.	Contact dealer technical support for information on security system. For fuel system, refer to FUEL CHARGING & CONTROLS . Check TSBs for throttle cleaning procedure.Check service actions.
	Engine cranks and fires, but will not start	Rochester valve Fuel pump relay Throttle contaminated Purge valve Fuel pump Engine coolant temperature (ECT) sensor Spark plugs fouled Cylinder compression loss - short-term. Refer to any applicable TSBs. Refer to any applicable TSBs.	For rochester valve tests, GO to Pinpoint Test G270236P34 . For fuel pump relay tests, GO to Pinpoint Test G270236P22 . Check bulletins for throttle cleaning procedure. Check fuel pressure. Refer to any applicable TSBs. For ECT sensor tests, GO to Pinpoint Test G270236P3 . For ignition system, refer to ENGINE IGNITION . Check bulletins and service actions.
Difficult to start	Difficult to start cold	Throttle contaminated Rochester valve Blocked part-load breather (service action S474) Cylinder compression loss - short-term. Refer to any applicable TSBs. Fuel pump Battery Engine coolant temperature (ECT) sensor Purge valve Refer to any applicable TSBs.	For Rochester valve test, GO to Pinpoint Test G270236P34 . Check battery and charging system, refer to GENERATORS & REGULATORS . Check bulletins for throttle cleaning procedure. Check fuel pressure. For ECT sensor circuit tests, GO to Pinpoint Test G270236P3 . For evaporative emissions tests, refer to EVAPORATIVE EMISSIONS . Refer to any applicable TSBs for compression information, and service actions for part-load breather procedure and compressions.
	Difficult to start hot	Rochester valve Throttle contaminated Injector leak Purge valve Fuel pump Engine coolant temperature (ECT) sensor Blocked part-load breather, refer to PART-LOAD ENGINE BREATHER - PARTIAL BLOCKAGE OF RESTRICTOR - SCHEDULED CLEANING - SERVICE ACTION S474 .
	Difficult to start after hot soak (vehicle standing after engine has reached operating temperature)	Rochester valve Throttle contaminated Injector leak Purge valve Fuel pump Engine coolant temperature (ECT) sensor Blocked part-load breather, refer to PART-LOAD ENGINE BREATHER - PARTIAL BLOCKAGE OF RESTRICTOR - SCHEDULED CLEANING - SERVICE ACTION S474 .	G270236P34 . For evaporative emissions tests, refer to EVAPORATIVE EMISSIONS . Check bulletins for throttle cleaning procedure. Check fuel pressure. For ECT sensor circuit tests, GO to Pinpoint Test G270236P3 . Blocked part-load breather, refer to PART-LOAD ENGINE BREATHER - PARTIAL BLOCKAGE OF RESTRICTOR - SCHEDULED CLEANING - SERVICE ACTION S474 . For injector leak test, refer to LONG CRANKING - DIFFICULT WARM/HOT START - DIAGNOSIS PROCEDURE - AJ 26 NORMALLY ASPIRATED ENGINES .
	Engine cranks too fast/slow	Battery Starter relay Harness Cylinder compression loss - short term only. Refer to LONG CRANKING - DIFFICULT WARM/HOT START - DIAGNOSIS PROCEDURE - AJ 26 NORMALLY ASPIRATED ENGINES . Refer to any applicable TSBs.	Check battery and charging system, refer to GENERATORS & REGULATORS . For starting system, refer to STARTING SYSTEM . Refer to any applicable TSBs.
Engine stalls	Engine stalls soon after start	Throttle contaminated Fuel pressure regulator Air leakage ECM relay Fuel pump relay Fuel pump Engine coolant temperature (ECT) sensor CMP/CKP sensor synchronization malfunction Harness Fuel lines	Check relay dates. Check for DTCS. For fuel pump relay tests, GO to Pinpoint Test G270236P22 . For ECM relay tests, GO to Pinpoint Test G270236P33 . Check bulletins for throttle cleaning procedure. For CMP sensor circuit tests, GO to Pinpoint Test G270236P15 . For CKP sensor circuit tests, GO to Pinpoint Test G270236P14 . Check fuel pressure. For MAF sensor circuit tests, GO to Pinpoint Test G270236P1 . For ECT sensor tests, GO to Pinpoint Test G270236P3 . For fuel system, refer to FUEL CHARGING & CONTROLS and FUEL TANK & LINES . Check intake system.
	Engine stalls on overrun	Throttle contaminated ECM relay Fuel pump relay CMP/CKP sensor synchronization malfunction	Check bulletins for throttle cleaning procedure. Check relay dates. For ECM relay tests, GO to Pinpoint Test G270236P33 . For fuel pump relay tests, GO to Pinpoint Test G270236P22 . For CMP sensor circuit tests, GO to Pinpoint Test G270236P15 . For CKP sensor circuit tests, GO to Pinpoint Test G270236P14 .
	Engine stalls at steady speed, with or without cruise enabled.	Throttle contaminated ECM relay Fuel pump relay CMP/CKP sensor synchronization malfunction Harness Blocked part-load breather, refer to PART-LOAD ENGINE BREATHER - PARTIAL BLOCKAGE OF RESTRICTOR - SCHEDULED CLEANING - SERVICE ACTION S474 .	Check bulletins for throttle cleaning procedure. Check relay dates. For ECM relay circuit tests, GO to Pinpoint Test G270236P33 . For fuel pump relay circuit tests, GO to Pinpoint Test G270236P22 . For CMP sensor circuit tests, GO to Pinpoint Test G270236P15 . for CKP sensor circuit tests, GO to Pinpoint Test G270236P14 . Check service actions.
	Engine stalls when maneuvering	ECM relay Fuel pump relay CMP/CKP sensor synchronization malfunction	Check relay dates. For ECM relay circuit tests, GO to Pinpoint Test G270236P33 . For fuel pump relay circuit tests, GO to Pinpoint Test G270236P22 . For CMP sensor circuit tests, GO to Pinpoint Test G270236P15 . for CKP sensor circuit tests, GO to Pinpoint Test G270236P14 .
Poor driveability	Engine hesitates/poor acceleration	Exhaust gas recirculation (EGR) where fitted Fuel pump Air leakage Spark plugs fouled HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s) Throttle sensors Throttle motor	Check fuel pressure. For EGR information, refer to ENGINE EMISSION CONTROL . Check intake system. For stop lamp switch information, refer to SYSTEM WIRING DIAGRAMS . For throttle position sensor tests, GO to Pinpoint Test G270236P4 . For throttle motor control circuit tests, GO to Pinpoint Test G270236P20 . For ignition system, refer to ENGINE IGNITION . For ECM circuit tests, GO to Pinpoint Test G270236P33 .
	Engine backfires	Fuel pump Air leakage MAF sensor HO2 sensors Spark plugs HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s)	Check fuel pressure. Check intake system. For MAF sensor circuit tests, GO to Pinpoint Test G270236P1 . For HO2 sensor circuit tests, check for DTC indicating which sensor and follow indicated pinpoint test. For ignition system, refer to ENGINE IGNITION .
	Engine surges	Air leakage Fuel pump Stop lamp switch MAF sensor Harness Throttle sensors Throttle motor Spark plugs HT short to ground (tracking) check rubber boots for cracks/damage ECM failure	Check intake system. Check fuel pressure. For stop lamp information, refer to SYSTEM WIRING DIAGRAMS . For MAF sensor tests, GO to Pinpoint Test G270236P1 . For throttle position sensor tests, GO to Pinpoint Test G270236P4 . and GO to Pinpoint Test G270236P11 . For throttle motor circuit tests, GO to Pinpoint Test G270236P20 . For ignition system, refer to ENGINE IGNITION . For ECM circuit tests, GO to Pinpoint Test G270236P33 .
	Engine detonates/knocks	Fuel pump HO2 sensors Air leakage Blocked part-load breather, refer to PART-LOAD ENGINE BREATHER - PARTIAL BLOCKAGE OF RESTRICTOR - SCHEDULED CLEANING - SERVICE ACTION S474 . Mass air flow (MAF) sensor	Check fuel pressure. For HO2 sensor circuit tests, check for DTC indicating which sensor and follow indicated pinpoint test. Check intake system. Check PART-LOAD ENGINE BREATHER - PARTIAL BLOCKAGE OF RESTRICTOR - SCHEDULED CLEANING - SERVICE ACTION S474 . For MAF sensor tests, GO to Pinpoint Test G270236P1 .
	No throttle response	Traction control invoked Throttle sensors Throttle motor	For throttle position sensor tests, GO to Pinpoint Test G270236P4 . and GO to Pinpoint Test G270236P11 . For throttle motor circuit tests, GO to Pinpoint Test G270236P20 .
	Cruise control inhibited or disabled	Cruise control switch Throttle sensors Stop lamp switch	For cruise control switches, refer to SPEED CONTROL . For throttle position sensor tests, GO to Pinpoint Test G270236P4 . and GO to Pinpoint Test G270236P11 . For stop light switch information, refer to SYSTEM WIRING DIAGRAMS .