Inspection and Verification
- Verify the customer concern.
- Confirm which, if any, warning lights and/or messages were displayed on the instrument cluster. NOTE: If any warning lights and/or messages were displayed when the fault occurred, refer to the Driver Information table for DTCs associated with the display, then to «Diagnostic Trouble Code (DTC) Index»(ref-311048-S31244600492009032300000) table for possible sources and actions. Some warnings will appear to clear when the ignition is cycled. This is often because the warning has flagged as a result of one of the vehicle's on-board diagnostic routines having run to detect the fault. If the same routine is not run when the ignition is switched ON, the warning will not reflag until the routine does run. See the DTC summaries for drive cycle routines.
- 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 Fuses. Wiring harness Electrical connector(s) Sensor(s) Engine control module (ECM) Transmission control module
- Verify the following systems are working correctly: Air intake system Cooling system Charging system Fuel 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 | Possible source | Action |
|---|---|---|
| Engine cranks, but does not fire | Engine breather system disconnected/restricted Ignition system Fuel system Harness CKP sensor ECM fault | Check engine breather system, Refer to Engine Emission Control article. For ignition system tests, refer to Pinpoint Tests . Check fuel pressure. For CKP tests, Refer to Electronic Engine Controls article. Contact Dealer technical support for advice on possible ECM failure. |
| 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 (SC only) HT short to ground (tracking) check rubber boots for cracks/damage Ignition coil failure(s) Harness | For evaporative emissions components, Refer to Evaporative Emissions article. Check fuel pressure. For ECT sensor tests, Refer to Electronic Engine Controls article. For ignition system tests, refer to Pinpoint Tests . |
| Difficult to start cold | Check coolant anti-freeze content Battery CKP sensor EGR valve stuck open Fuel pump Coolant temperature sensor Purge valve | For battery information, Refer to Battery, Mounting and Cables article. For CKP sensor tests, Refer to Electronic Engine Controls article. For EGR system information, Refer to Engine Emission Control article. Check fuel pressure. For ECT sensor tests, Refer to Electronic Engine Controls article. For evaporative emissions components, Refer to Evaporative Emissions article. |
| Difficult to start hot | Injector leak Fuel temperature sensor IAT sensor MAF sensor Purge valve Fuel pump Ignition system Coolant temperature sensor EGR valve stuck open | For fuel injectors, Refer to Fuel Charging and Controls article. For fuel temperature sensor, IAT sensor and MAF sensor tests, Refer to Electronic Engine Controls article. For evaporative emissions components, Refer to Evaporative Emissions article. Check fuel pressure. For ignition system tests, refer to Pinpoint Tests . For ECT sensor tests, Refer to Electronic Engine Controls article. |
| Difficult to start after hot soak (vehicle standing after engine has reached operating temperature) | Injector leak Fuel temperature sensor IAT sensor MAF sensor Purge valve Fuel pump Ignition system Coolant temperature sensor EGR valve stuck open | For fuel injectors, Refer to Fuel Charging and Controls article. For fuel temperature sensor, IAT sensor and MAF sensor tests, Refer to Electronic Engine Controls article. For evaporative emissions components, Refer to Evaporative Emissions article. Check fuel pressure. For ignition system tests, refer to Pinpoint Tests . For ECT sensor tests, Refer to Electronic Engine Controls article. For EGR information, Refer to Engine Emission Control article. |
| Engine stalls soon after start | Breather system disconnected/restricted ECM relay Harness MAF sensor Coolant temperature sensor Ignition system Air filter restricted Fuel lines Fuel pressure sensor Air leakage | For breather system, Refer to Engine Emission Control article. For ECM relay, MAF sensor and ECT sensor tests, Refer to Electronic Engine Controls article. For ignition system tests, refer to Pinpoint Tests . For air filter information, Refer to Intake Air Distribution and Filtering article. For fuel line information, Refer to Fuel Tank and Lines article. For fuel pressure sensor tests, Refer to Fuel Charging and Controls article. For intake system information, Refer to Intake Air Distribution and Filtering article. |
| Engine hesitates/poor acceleration | Fuel pump Injector leak Fuel pressure Fuel lines Air leakage Throttle sensors Throttle motor Ignition system Exhaust gas recirculation Oxygen sensors Transmission malfunction Restricted pedal travel (carpet, etc) APP sensor | Check fuel pressure. For fuel pressure sensor tests, Refer to Fuel Charging and Controls article. For fuel line information, Refer to Fuel Tank and Lines article. For intake system, Refer to Intake Air Distribution and Filtering article. For throttle position sensor and throttle motor tests, Refer to Electronic Engine Controls article. For ignition system tests, refer to Pinpoint Tests , For exhaust gas recirculation, Refer to Engine Emission Control article. Check for DTCs relating to Oxygen sensors. Refer to Diagnostic Trouble Code (DTC) Index for pinpoint tests for DTC set. For transmission information, Refer to Automatic Transmission/Transaxle article. Check accelerator pedal travel. For APP sensor tests, Refer to Electronic Engine Controls article. |
| Engine backfires | Fuel pump Fuel lines Air leakage MAF sensor Oxygen sensors Ignition system Sticking VCT hub APP sensor | Check fuel pressure. For fuel line information, Refer to Fuel Tank and Lines article. For intake system, Refer to Intake Air Distribution and Filtering article. For MAF sensor tests, Refer to Electronic Engine Controls article. Check for DTCs relating to Oxygen sensors. Refer to Diagnostic Trouble Code (DTC) Index for pinpoint tests for DTC set. For ignition system tests, refer to Pinpoint Tests . For VCT information, Refer to Engine article. For APP sensor tests, Refer to Electronic Engine Controls article. |
| Engine surges | Fuel pump Fuel lines MAF sensor Harness Throttle sensors Throttle motor Ignition system | Check fuel pressure. For fuel line information, Refer to Climate Control System - General Information article. For MAF sensor, throttle sensor, and throttle motor relay tests, Refer to Electronic Engine Controls article. For ignition system tests, refer to Pinpoint Tests . |
| Engine detonates/knocks | KS/circuit malfunction Fuel pump Fuel lines Fuel pressure sensor MAF sensor Oxygen sensors Air leakage Sticking VCT hub BARO sensor malfunction | For KS circuit tests, Refer to Electronic Engine Controls article. Check fuel pressure. For fuel line information, Refer to Fuel Tank and Lines article. For fuel pressure sensor tests, Refer to Fuel Charging and Controls article. For MAF sensor and oxygen sensor tests, Refer to Electronic Engine Controls article. For intake system, Refer to Intake Air Distribution and Filtering article. Check DTCs for VCT range/performance fault. For VCT information, Refer to Engine article. For BARO sensor, contact Dealer technical support for advice on possible ECM failure |
| No throttle response | APP sensor malfunction Throttle sensors Throttle motor | For APP sensor, throttle position sensor and throttle motor relay tests, Refer to Electronic Engine Controls article. |
| Poor throttle response | APP sensor malfunction Throttle sensors Coolant temperature sensor MAF sensor Transmission malfunction Traction control event Air leakage Breather system disconnected/restricted | For APP sensor, throttle position sensor, ECT sensor and MAF sensor tests, Refer to Electronic Engine Controls article. For transmission information, Refer to Automatic Transmission/Transaxle article. For intake system, Refer to Intake Air Distribution and Filtering article. For breather system information, Refer to Engine Emission Control article. |
Symptom Chart
Diagnostic Trouble Code (DTC) Index
| DTC | Description | Possible Source | Action |
|---|---|---|---|
| P0300 | Random misfire detected | ECM to ignition coil primary circuit fault (cylinder misfire detected DTC also flagged) Fuel injector circuit fault(s) (injector DTCs also flagged) Ignition coil failure Spark plug failure/fouled/incorrect gap Cylinder compression low Fuel delivery pressure (low/high) Fuel injectors restricted/leaking Fuel injectors continuously open Fuel contamination Worn camshaft/broken valve springs | For ignition coil circuit tests, Refer to Pinpoint Test A . For fuel system, Refer to Fuel Charging and Controls article. Check spark plug condition/gap, Refer to Pinpoint Test B: CHECK SPARK PLUG RESISTANCE . For spark plug test, Refer to Pinpoint Test B . For engine information, Refer to Engine System - General Information article. |
| P0301 | Misfire detected, Cyl 1 | ECM to ignition coil primary circuit fault (cylinder misfire detected DTC also flagged) Fuel injector circuit fault(s) (injector DTCs also flagged) Ignition coil failure Spark plug failure/fouled/incorrect gap Cylinder compression low Fuel delivery pressure (low/high) Fuel injectors restricted/leaking Fuel injectors continuously open Fuel contamination Worn camshaft/broken valve springs | For ignition coil circuit tests, Refer to Pinpoint Test A . For fuel system, Refer to Fuel Charging and Controls article. Check spark plug condition/gap, Refer to Pinpoint Test B: CHECK SPARK PLUG RESISTANCE . Refer to Pinpoint Test B . For engine information, Refer to Engine System - General Information article. |
| P0302 | Misfire detected, Cyl 3 | ||
| P0303 | Misfire detected, Cyl 5 | ||
| P0304 | Misfire detected, Cyl 7 | ||
| P0305 | Misfire detected, Cyl 2 | ||
| P0306 | Misfire detected, Cyl 4 | ||
| P0307 | Misfire detected, Cyl 6 | ||
| P0308 | Misfire detected, Cyl 8 | ||
| P0351 | Ignition coil primary/secondary circuit malfunction, cyl 1 | ECM to ignition coil primary circuit open circuit, short circuit to ground, high resistance Ignition coil ground circuit open circuit, high resistance Ignition coil failure * Early production vehicles only, ignition coil relay | For ignition coil circuit tests, Refer to Pinpoint Test A . |
| P0352 | Ignition coil primary/secondary circuit malfunction, cyl 3 | ||
| P0353 | Ignition coil primary/secondary circuit malfunction, cyl 5 | ||
| P0354 | Ignition coil primary/secondary circuit malfunction, cyl 7 | ||
| P0355 | Ignition coil primary/secondary circuit malfunction, cyl 2 | ||
| P0356 | Ignition coil primary/secondary circuit malfunction, cyl 4 | ||
| P0357 | Ignition coil primary/secondary circuit malfunction, cyl 6 | ||
| P0358 | Ignition coil primary/secondary circuit malfunction, cyl 8 | ||
| P0603 | ECM data corrupted | ECM | Contact Dealer technical support for advice on possible ECM failure. |
| P1000 | System checks not complete since last memory clear | OBD monitors have not completed | Carry out comprehensive component monitor drive cycle. |
| P1111 | System checks complete since last memory clear | OBD monitors have completed | No action necessary |
| P1313 | Misfire rate catalyst damage, Right-Hand bank. NOTE. This DTC will flag only when accompanied by a random or individual cylinder misfire DTC; P0300, P0301 to P0304 | Refer to Pinpoint Test A: DTC P0300, P0301-0308, P0351-0358; RANDOM MISFIRE DETECTED, MISFIRE DETECTED, (CYLINDERS 1-8) IGNITION COIL PRIMARY CIRCUIT MALFUNCTION, (CYLINDERS 1-8) P0300 possible sources | Refer to Pinpoint Test A: DTC P0300, P0301-0308, P0351-0358; RANDOM MISFIRE DETECTED, MISFIRE DETECTED, (CYLINDERS 1-8) IGNITION COIL PRIMARY CIRCUIT MALFUNCTION, (CYLINDERS 1-8) |
| P1314 | Misfire rate catalyst damage, Left-Hand bank. NOTE. This DTC will flag only when accompanied by a random or individual cylinder misfire DTC; P0300 to P0308 | ||
| P1316 | Misfire excess emission. NOTE. This DTC will flag only when accompanied by an individual cylinder misfire DTC; P0300 to P0308 | ||
| P1367 | Ignition monitor (Right-Hand bank) | Ignition monitoring circuit between splice and ECM open circuit, short circuit to ground, or short circuit to B+ voltage Ignition coil group ground circuit fault Ignition coil relay failure | For coil circuit tests, Refer to Pinpoint Test A . |
| P1368 | Ignition monitor (Left-Hand bank) | Ignition monitoring circuit between splice and ECM open circuit, short circuit to ground, or short circuit to B+ voltage Ignition coil group ground circuit fault Ignition coil relay failure | For coil circuit tests, Refer to Pinpoint Test A . |
Pinpoint Test A: DTC P0300, P0301-0308, P0351-0358; RANDOM MISFIRE DETECTED, MISFIRE DETECTED, (CYLINDERS 1-8) IGNITION COIL PRIMARY CIRCUIT MALFUNCTION, (CYLINDERS 1-8)
Note. Unless multiple cylinder misfires are apparent, only one circuit will normally need to be tested. The DTC set will indicate which cylinder is misfiring.
Note. Early production vehicles may be fitted with an ignition coil relay, which was deleted for later vehicles.
Pinpoint Test A
A1
CHECK COIL FUNCTION BY SUBSTITUTION
- Swap the suspect coil for a known good unit.
- CLEAR the DTC. TEST the system for normal operation.
- Does the same DTC reoccur? The DTC will indicate if the same cylinder is misfiring.
YES INSTALL a new coil. CLEAR the DTC. TEST the system for normal operation.
NO Go to step 2 . → 2
A2
CHECK THE IGNITION COIL SUPPLY VOLTAGE CIRCUIT
- Disconnect the relevant ignition coil electrical connector(s).
- Turn the ignition switch to the ON position.
- Make sure the ignition coil relay is energized, where fitted.
- Measure the voltage between
Is the voltage less than 10.5 Volts?
YES REPAIR the relevant ignition coil supply voltage circuit. This circuit may include the ignition coil relay, and the engine bay fuse box (fuse 5). For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Go to step 3 . → 3
A3
CHECK THE IGNITION COIL GROUND CIRCUIT
- Turn the ignition switch to the OFF position.
- Disconnect the relevant ignition coil electrical connector(s).
- Measure the resistance between
Is the resistance greater than 5 ohms?
YES REPAIR the high resistance circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Go to step 4 . → 4
A4
CHECK THE IGNITION COIL SWITCHING CIRCUITS FOR HIGH RESISTANCE
- Disconnect the battery negative terminal.
- Disconnect the ECM electrical connector, EM80.
- Disconnect the relevant ignition coil electrical connector(s).
- Measure the resistance between
Is the resistance greater than 5 ohms?
YES REPAIR the high resistance circuit. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Go to step 5 . → 5
A5
CHECK THE IGNITION COIL (CYLS 1, 4, 6, AND 7) MONITOR CIRCUITS FOR HIGH RESISTANCE
- Disconnect the relevant ignition coil electrical connector(s).
- Measure the resistance between
Is the resistance greater than 5 ohms?
YES REPAIR the high resistance circuit. This circuit includes the harness splice, PIS11. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Go to step 6 . → 6
A6
CHECK THE IGNITION COIL (CYLS 1, 4, 6, AND 7) MONITOR CIRCUITS FOR SHORT TO B+ VOLTAGE
- Reconnect the battery negative terminal.
- Disconnect the relevant ignition coil electrical connector(s).
- Measure the voltage between
Is the voltage greater than 3 volts?
YES REPAIR the short to B+ voltage. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Go to step 7 . → 7
A7
CHECK THE IGNITION COIL (CYLS 1, 4, 6, AND 7) MONITOR CIRCUITS FOR SHORT TO GROUND
- Disconnect the relevant ignition coil electrical connector(s).
- Measure the resistance between
Is the resistance less than 10,000 ohms?
YES REPAIR the short to GROUND. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Go to step 8 . → 8
A8
CHECK THE IGNITION COIL (CYLS 2, 3, 5, AND 8) MONITOR CIRCUITS FOR HIGH RESISTANCE
- Disconnect the relevant ignition coil electrical connector(s).
- Measure the resistance between
Is the resistance greater than 5 ohms?
YES REPAIR the high resistance circuit. This circuit includes the harness splice, PIS12. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Go to step 9 . → 9
A9
CHECK THE IGNITION COIL (CYLS 2, 3, 5, AND 8) MONITOR CIRCUITS FOR SHORT TO B+ VOLTAGE
- Reconnect the battery negative terminal.
- Disconnect the relevant ignition coil electrical connector(s).
- Measure the voltage between
Is the voltage greater than 3 volts?
YES REPAIR the short to B+ voltage. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Go to step 10 . → 10
A10
CHECK THE IGNITION COIL (CYLS 2, 3, 5, AND 8) MONITOR CIRCUITS FOR SHORT TO GROUND
- Disconnect the relevant ignition coil electrical connector(s).
- Measure the resistance between
Is the resistance less than 10,000 ohms?
YES REPAIR the short to GROUND. For additional information, See appropriate SYSTEM WIRING DIAGRAMS article. CLEAR the DTCs. TEST the system for normal operation.
NO Contact Dealer technical support for advice on possible ECM failure.
Pinpoint Test B: CHECK SPARK PLUG RESISTANCE
Note. Only resisted spark plugs must be used.
Pinpoint Test B
B1
CHECK SPARK PLUG RESISTANCE
- Remove the suspect spark plug(s). Refer to «Pinpoint Test B: CHECK SPARK PLUG RESISTANCE»(ref-311048-S39740681302009032300000) .
- Measure the resistance between the spark plug center electrode tip and the spark plug HT contact.
- Is the resistance between 8,000 and 12,000 ohms? (nominal 10,000 ohms)
YES Check ignition coil and circuits. See possible sources list for misfire.
NO INSTALL a new spark plug. Refer to «Pinpoint Test B: CHECK SPARK PLUG RESISTANCE»(ref-311048-S39740681302009032300000) . CLEAR the DTC. TEST the system for normal operation.