Inspection and Verification

Verify the customer concern.

Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical	Electrical
Engine oil level Cooling system coolant level Fuel level Fuel Contamination/grade/quality Throttle body Poly-vee belt Engine breather system pipework/connections PCV valve condition EGR pipework condition. (cracking, etc)	Fuses. Wiring harness Electrical connector(s) Sensor(s) Engine control module (ECM)

Verify the following systems are working correctly:
- Air intake system
- Cooling system
- Charging system
- Fuel charging system
- Ignition 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.
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 (general)	Symptom (specific)	Possible source	Action
Non-Start	Engine cranks, but does not fire	Engine breather system disconnected/restricted Spark plugs Check for water ingress into spark plug wells HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s) Fuel system Harness CKP sensor ECM fault	Check engine breather system, see Visual inspection table in this section. For ignition system, Refer to Engine Ignition . For fuel system, Refer to Fuel Charging and Controls . For CKP sensor tests, Refer to Electronic Engine Controls . Contact Dealer technical support for advice on possible ECM failure.
Non-Start	Engine cranks and fires, but will not start	Purge valve Fuel pump Coolant temperature sensor Spark plugs Check for water ingress into spark plug wells HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s)	For evaporative emissions components, Refer to Evaporative Emissions . Check fuel pressure. For ECT sensor tests, Refer to Electronic Engine Controls . For ignition system, Refer to Engine Ignition .
Difficult to start	Difficult to start cold	Battery Check coolant anti-freeze content CKP sensor EGR valve stuck open Fuel pump Engine coolant temperature (ECT) sensor Purge valve	For battery information, Refer to Battery, Mounting and Cables . For CKP sensor tests, Refer to Electronic Engine Controls . Check EGR valve. For EGR valve circuit tests, Refer to Pinpoint Test A . Check fuel pressure. For ECT sensor tests, Refer to Electronic Engine Controls . For evaporative emissions components, Refer to Evaporative Emissions .
	Difficult to start hot	Injector leak Fuel temperature sensor IAT sensor MAF sensor Engine coolant temperature (ECT) sensor Purge valve Fuel pump Spark plugs Check for water ingress into spark plug wells HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s) EGR valve stuck open	For fuel system, Refer to Fuel Charging and Controls . For IAT sensor, MAF sensor, ECT sensor tests, Refer to Electronic Engine Controls . For evaporative emissions components, Refer to Evaporative Emissions . Check fuel pressure. For ignition system, Refer to Engine Ignition . Check EGR valve. For EGR valve circuit tests, Refer to Pinpoint Test A .
	Difficult to start after hot soak (vehicle standing after engine has reached operating temperature)	Injector leak Fuel temperature sensor IAT sensor MAF sensor Engine coolant temperature (ECT) sensor Purge valve Fuel pump Spark plugs Check for water ingress into spark plug wells HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s) EGR valve stuck open
	Engine stalls soon after start	Engine breather system disconnected/restricted ECM relay Harness MAF sensor Engine coolant temperature (ECT) sensor Spark plugs Check for water ingress into spark plug wells HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s) Air filter restricted Fuel lines Fuel pressure sensor Air leakage	Check breather system pipework and connections, see visual inspection table. For ECM relay tests, MAF sensor tests, ECT sensor tests, Refer to Electronic Engine Controls . For ignition system ,Refer to Engine Ignition . For fuel lines, Refer to Fuel Tank and Lines . For fuel pressure sensor tests, Refer to Electronic Engine Controls . For intake system information, restriction/leaking, Refer to Intake Air Distribution and Filtering .
Engine stalls	Engine stalls soon after start
	Engine stalls on overrun	ECM relay Throttle sensors	For ECM relay tests, throttle sensor tests, Refer to Electronic Engine Controls . For fuel system, Refer to Fuel Charging and Controls .
	Engine stalls at steady speed	ECM relay CKP sensor Throttle sensors	For ECM relay tests, Refer to Electronic Engine Controls . For fuel system, Refer to Fuel Charging and Controls . For CKP sensor tests, throttle sensor tests, Refer to Electronic Engine Controls .
	Engine stalls with cruise control enabled	ECM relay	For ECM relay tests, Refer to Electronic Engine Controls .
	Engine stalls when maneuvering	ECM relay Throttle sensors	For ECM relay tests, throttle position sensor tests, Refer to Electronic Engine Controls .
Poor driveability	Engine hesitates/poor acceleration	Fuel pump Injector leak Fuel pressure regulator Fuel lines Air leakage Throttle sensors Throttle motor Spark plugs Check for water ingress into spark plug wells HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s) EGR valve malfunction	For fuel pump, fuel pressure regulator, fuel line and injector tests, Refer to Fuel Charging and Controls . For intake system, Refer to Intake Air Distribution and Filtering . For throttle position sensor tests, Refer to Electronic Engine Controls . For throttle motor tests, Refer to Fuel Charging and Controls . For ignition system, Refer to Engine Ignition . For EGR valve circuit tests, Refer to Pinpoint Test A .
	Engine backfires	Fuel pump Fuel lines Air leakage MAF sensor Oxygen sensors Spark plugs Check for water ingress into spark plug wells HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s)	For fuel pump and lines, Refer to Fuel Charging and Controls . For intake system, Refer to Intake Air Distribution and Filtering . For MAF sensor tests, oxygen sensor tests, Refer to Electronic Engine Controls . For ignition system, Refer to Engine Ignition .
	Engine surges	Air leakage Fuel pump Fuel lines MAF sensor Harness Throttle sensors Throttle motor Spark plugs Check for water ingress into spark plug wells HT short to ground (tracking) check rubber boots for cracks/damage	For intake system, Refer to Intake Air Distribution and Filtering . For fuel pump and lines, Refer to Fuel Charging and Controls . For MAF sensor tests, throttle position sensor tests, Refer to Electronic Engine Controls . For ignition system, Refer to Engine Ignition .
	Engine detonates/knocks	KS/circuit malfunction Fuel pump Fuel lines Fuel pressure regulator MAF sensor Oxygen sensors Air leakage	For KS and circuit tests, Refer to Electronic Engine Controls . For fuel pump, lines and regulator tests, Refer to Fuel Charging and Controls . FOR MAF sensor tests, oxygen sensor tests, Refer to Electronic Engine Controls . For intake system, Refer to Intake Air Distribution and Filtering .
	No throttle response	Throttle sensors Throttle motor	For throttle position sensor tests, Refer to Electronic Engine Controls . For throttle motor tests, Refer to Fuel Charging and Controls .
	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, Refer to Electronic Engine Controls . Check electrical guides for stop light switch information.
	Poor throttle response	Throttle sensors Coolant temperature sensor MAF sensor	For throttle position sensor tests, ECT sensor tests, MAF sensor tests, Refer to Electronic Engine Controls .
	Engine defaults (warning light and messages)	Park/Neutral switch Throttle sensors MAF sensor Coolant temperature sensor Harness	For Park/Neutral tests, Refer to Automatic Transmission/Transaxle External Controls . For throttle position sensor tests, MAF sensor tests, ECT sensor tests, Refer to Electronic Engine Controls .