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 (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. |
| 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 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 . |
Symptom Chart
Diagnostic Trouble Code (DTC) index
| DTC | Description | Possible Source | Action |
|---|---|---|---|
| P0400 | EGR flow malfunction | EGR valve incorrectly fitted or loose EGR pipe blocked EGR valve stuck open/closed EGR valve failure | Refer to the visual inspection table. Check EGR valve fitment, pipework, etc. For EGR valve circuit tests, Refer to Pinpoint Test A . |
| P0405 | EGR valve drive circuits low voltage | EGR valve power supply circuit open circuit EGR valve to ECM drive circuit pair; (EGR valve pins 1/4; 6/3) open circuit, high resistance EGR valve failure (stepper motor open circuit) | For EGR valve circuit tests, Refer to Pinpoint Test A . |
| P0406 | EGR valve drive circuits high voltage | EGR valve to ECM drive circuit pair; (EGR valve pins 1/4; 6/3) short circuit to ground or high voltage EGR valve failure (stepper motor short circuit) | For EGR valve circuit tests, Refer to Pinpoint Test A . |
Pinpoint Test A: DTC P0400, P0405, P0406; EGR VALVE DRIVE CIRCUITS HIGH/LOW VOLTAGE
Pinpoint Test A
A1
CHECK THE EGR VALVE POWER SUPPLY CIRCUIT
- Disconnect the EGR valve electrical connector, PI34.
- Turn the ignition switch to the ON position.
- Make sure the EMS relay is energized.
- Measure the voltage between PI34, pins 02 (WU) and 05 (WU).
Is the voltage less than 10 volts?
YES REPAIR the circuit between the EGR valve and battery. This circuit includes the EMS fuse box, (fuse 14) the EMS relay and the high power protection module. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
NO Go to step 2 . → 2
A2
CHECK THE EGR VALVE TO ECM DRIVE CIRCUITS FOR HIGH RESISTANCE (PIN 04)
- Turn the ignition switch to the OFF position.
- Disconnect the battery negative terminal.
- Disconnect the ECM electrical connector, EM80.
- Measure the resistance between PI34, pin 04 (YU) and EM80, pin 57 (YU).
Is the resistance greater than 5 ohms?
YES REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
NO Go to step 3 . → 3
A3
CHECK THE EGR VALVE TO ECM DRIVE CIRCUITS FOR HIGH RESISTANCE (PIN 06)
- Measure the resistance between PI34, pin 06 (Y) and EM80, pin 59 (Y).
Is the resistance greater than 5 ohms?
YES REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
NO Go to step 4 . → 4
A4
CHECK THE EGR VALVE TO ECM DRIVE CIRCUITS FOR HIGH RESISTANCE (PIN 01)
- Measure the resistance between PI34, pin 01 (YG) and EM80, pin 58 (YG).
Is the resistance greater than 5 ohms?
YES REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
NO Go to step 5 . → 5
A5
CHECK THE EGR VALVE TO ECM DRIVE CIRCUITS FOR HIGH RESISTANCE (PIN 03)
- Measure the resistance between PI34, pin 03 (YR) and EM80, pin 80 (YR).
Is the resistance greater than 5 ohms?
YES REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
NO INSTALL a new EGR valve. If the DTC is repeated, contact Dealer technical support for advice on possible ECM failure.