SPECIFICATIONS
| Item | Specification |
|---|---|
| Firing order | 1:2:7:3:4:5:6:8 |
| Spark plug type - Vehicles with supercharger | ILKAR6C-10 |
| Spark plug type - Vehicles without supercharger | ILKAR6C-10 |
| Description | Nm |
|---|---|
| Spark plugs | 20 |
| Ignition coil-on-plug retaining bolts | 7 |
COMPONENT LOCATION
| Item Number | Description |
|---|---|
| 1 | RFI (radio frequency interference) suppressor |
| 2 | ECM (engine control module) |
| 3 | Spark plug (8 off) |
| 4 | Ignition coil (8 off) |
Note. Installation on right-hand drive (RHD) naturally aspirated vehicle shown, other installations similar.
INTRODUCTION
The engine ignition system is a coil-on-plug, single spark system controlled by the engine control module (ECM). An iridium tipped spark plug is installed in each combustion chamber, between the inlet and exhaust valves, and an ignition coil is installed on each spark plug. A RFI (radio frequency interference) suppressor is connected to the power feed to the ignition coils.
IGNITION COILS
The ignition coils are installed in the cylinder head covers, under the noise, vibration and harshness (NVH) covers. Each ignition coil locates on a spark plug and is secured to the related cylinder head cover with a single screw. Each ignition coil incorporates a three pin electrical connector for connection to the engine harness.
Each ignition coil contains a primary and a secondary winding. The primary winding receives electrical power from the ignition relay in the power distribution box. A power stage in the primary winding allows the engine control module (ECM) to interrupt the power supply, to induce a voltage in the secondary winding and thus the spark plug. A diode in the ground side of the secondary winding reduces any undesirable switch-on voltage, to prevent misfiring into the intake manifold. The power stage limits the maximum voltage and current in the primary winding, to protect the power stage and limit the voltage in the secondary winding.
RFI SUPPRESSOR
The RFI (radio frequency interference) suppressor is installed on the engine harness carrier at the rear of the engine.
CONTROL DIAGRAM
Note. A = Hardwired
| Item Number | Description |
|---|---|
| 1 | Battery |
| 2 | EJB (engine junction box) (ECM relay) |
| 3 | RFI suppressor |
| 4 | LH (left hand) cylinder bank ignition coil (4 off) |
| 5 | RH (right hand) cylinder bank ignition coil (4 off) |
| 6 | ECM |
OPERATION
The ignition coils are supplied with electrical power from the battery via the engine control module (ECM) relay in the engine junction box (EJB). The engine control module (ECM) controls the operation of the engine control module (ECM) relay.
The engine control module (ECM) sends a separate signal to each ignition coil to trigger the power stage switching. The engine control module (ECM) calculates the dwell time from the battery voltage and engine speed, to ensure a constant energy level is produced in the secondary coil each time the power stage is switched. This ensures sufficient spark energy is available without excessive primary current flow, which avoids overheating and damage to the ignition coils.
The engine control module (ECM) calculates the ignition timing for individual cylinders from
- Engine speed
- Camshaft position
- Engine load
- Engine temperature
- The knock control function
- The shift control function
- The idle speed control function.
PRINCIPLES OF OPERATION
For a detailed description of the engine ignition system and operation, refer to ENGINE IGNITION .
INSPECTION AND VERIFICATION
| CAUTION | Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle. |
Note. Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical and electrical damage. VISUAL INSPECTION Mechanical Electrical Engine oil level Cooling system coolant level Fuel level Fuel contamination/grade/quality Exhaust gas recirculation (EGR) valves Fuses Wiring harness Loose or corroded electrical connectors Ignition coils Sensor(s) Engine Control Module (ECM) Transmission Control Module (TCM)
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.
SYMPTOM CHART
| Symptom | Possible Causes | Action |
|---|---|---|
| Engine cranks, but does not fire | Engine breather system disconnected/restricted Ignition system Fuel system Electronic engine control | Ensure the engine breather system is free from restriction and is correctly installed Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| Engine cranks and fires, but will not start | Evaporative emissions purge valve Fuel pump Spark plugs HT short to ground (tracking) check rubber boots for cracks/damage Ignition system | Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| Difficult cold start | Engine coolant level/anti-freeze content Battery Electronic engine controls Exhaust Gas Recirculation (EGR) valve stuck open Fuel pump Purge valve | Check the engine coolant level and condition Ensure the battery is in a fully charged and serviceable condition Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| Difficult hot start | Injector leak Electronic engine control Purge valve Fuel pump Ignition system EGR valve stuck open | Check for injector leak, install new injector as required Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| Difficult to start after hot soak (vehicle standing, engine off, after engine has reached operating temperature) | Injector leak Electronic engine control Purge valve Fuel pump Ignition system EGR valve stuck open | Check for injector leak, install new injector as required Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| Engine stalls soon after start | Breather system disconnected/restricted ECM relay Electronic engine control Ignition system Air intake system restricted Air leakage Fuel lines | Ensure the engine breather system is free from restriction and is correctly installed Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index Check for blockage in air filter and air intake system Check for air leakage in air intake system |
| Engine hesitates/poor acceleration | Fuel pressure, fuel pump, fuel lines Injector leak Air leakage Electronic engine control Throttle motor Restricted accelerator pedal travel (carpet, etc.) Ignition system EGR valve stuck open Transmission malfunction | Check for fuel system related DTCs and refer to the relevant DTC Index Check for injector leak, install new injector as required Check for air leakage in air intake system Ensure accelerator pedal is free from restriction Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) and Transmission Control Module (TCM) for related DTCs and refer to the relevant DTC index |
| Engine backfires | Fuel pump/lines Air leakage Electronic engine controls Ignition system Sticking variable camshaft timing (VCT) hub | Check for fuel system failures Check for air leakage in intake air system Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| Engine surges | Fuel pump/lines Electronic engine controls Throttle motor Ignition system | Check for fuel system failures Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| Engine detonates/knocks | Fuel pump/lines Air leakage Electronic engine controls Sticking VCT hub | Check for fuel system failures Check for air leakage in intake air system Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| No throttle response | Electronic engine controls Throttle motor | Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index |
| Poor throttle response | Breather system disconnected/restricted Electronic engine control Transmission malfunction Traction control event Air leakage | Ensure the engine breather system is free from restriction and is correctly installed Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM), Transmission Control Module (TCM), and Anti-lock Brake System control module (ABS) for related DTCs and refer to the relevant DTC index Check for air leakage in intake air system |
DTC INDEX
For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to DIAGNOSTIC TROUBLE CODE (DTC) INDEX - DTC: ENGINE CONTROL MODULE (PCM) 5.0L V8 .
REMOVAL
Note. Removal steps in this procedure may contain installation details.
Scheme 1
Scheme 2
- Refer to «ENGINE COVER - 5.0L»(/land-rover/range-rover-sport/l320-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
- Torque: 7 Nm
INSTALLATION
- To install, reverse the removal procedure.
SPARK PLUGS (V8 5.0L PETROL)
SPECIAL TOOL(S) Tool Description Part Number Spark Plug Remover/Installer 303-1450
Note. Removal steps in this procedure may contain installation details.
Scheme 3
Scheme 4
- Refer to «ENGINE COVER - 5.0L NA V8 - AJ133»(/land-rover/range-rover-sport/l320-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
- Torque: 7 Nm
- Spark Plug Remover/Installer (303-1450). Refer to: «SPECIAL TOOL(S)»(/land-rover/range-rover-sport/l320-2009-2013/remont/ignition-system/#engine-ignition) Torque: 20 Nm
- To install, reverse the removal procedure.
SPECIAL TOOL(S) Tool Description Part Number Spark Plug Remover/Installer 303-1450
Note. Removal steps in this procedure may contain installation details.
Scheme 5
Scheme 6
Scheme 7
Scheme 8
- Refer to «ENGINE COVER - 5.0L»(/land-rover/range-rover-sport/l320-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
- Torque: 7 Nm
- Spark Plug Remover/Installer (303-1450). Refer to: «SPECIAL TOOL(S)»(/land-rover/range-rover-sport/l320-2009-2013/remont/ignition-system/#engine-ignition) Torque: 20 Nm
- To install, reverse the removal procedure.