SPECIFICATIONS
| Item | Specification |
|---|---|
| Spark plugs | |
| Make | NGK |
| Type | 1FR5N10 Iridium plug |
| Gap | 1.0 mm (0.039 in) |
| Ignition coils | |
| Make | Denso |
| Type | 2W93-12A366-BA |
| Firing Order | 1-5-4-2-6-3-7-8 |
GENERAL SPECIFICATION
| Description | Nm |
|---|---|
| Ignition coil bolt | 6 |
| Spark plugs | 25 |
TORQUE SPECIFICATIONS
Scheme 1
| Item | Part Number | Description |
|---|---|---|
| 1 | Ignition coil | |
| 2 | Capacitor | |
| 3 | Spark plug |
GENERAL
The 4.2L engine ignition system has a single iridium tipped spark plug per cylinder, with each spark plug powered by an on-plug ignition coil. The ignition coils are directly driven by the engine control module (ECM).
Power for the ignition coils is supplied from the main relay and a fuse in the battery junction box (BJB). A capacitor is connected in parallel with the power supplies to the ignition coils to suppress RFI (radio frequency interference).
Each ignition coil contains a power stage to switch the current in the primary circuit. The ECM controls the switching with a signal to the power stage. The ECM monitors operation of the ignition coils using a feedback signal from each of the power stages. If a fault is detected the ECM stores an appropriate fault code.
The ECM varies the dwell time of the ignition coils depending on 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 a good spark is always produced by the spark plug without excessive primary current flow, thus avoiding overheating or damage to the ignition coils.
The 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.
ENGINE IGNITION CONTROL DIAGRAM
Note. A = Hardwired connections
Scheme 2
| Item | Part Number | Description |
|---|---|---|
| 1 | Battery | |
| 2 | Fusible link 11E, BJB | |
| 3 | Ignition switch | |
| 4 | Fuse 25P, ignition feed, central junction box (CJB) | |
| 5 | Fuse 60P, crank feed, CJB | |
| 6 | ECM | |
| 7 | Ignition coil and spark plug 5 | |
| 8 | Ignition coil and spark plug 2 | |
| 9 | Ignition coil and spark plug 3 | |
| 10 | Ignition coil and spark plug 8 | |
| 11 | Capacitor | |
| 12 | Ignition coil and spark plug 4 | |
| 13 | Ignition coil and spark plug 7 | |
| 14 | Ignition coil and spark plug 6 | |
| 15 | Ignition coil and spark plug 1 | |
| 16 | Fuse 6E, BJB | |
| 17 | Main relay |
OVERVIEW
For information on the operation of the system, refer to the relevant service information.
INSPECTION AND VERIFICATION
- Verify the customer concern.
- Visually inspect for obvious mechanical or electrical faults. VISUAL INSPECTION Mechanical Electrical Engine oil level Cooling system coolant level Fuel level Fuel contamination/grade/quality 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.
- Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index. Make sure that all DTCs are cleared following rectification.
SYMPTOM CHART
| Symptom (general) | Symptom (specific) | Possible causes | Action |
|---|---|---|---|
| Non-Start | Engine cranks, but does not fire | Low/Contaminated fuel Ignition system Fuel system Crankshaft position (CKP) sensor Harness ECM fault | Check the fuel level and condition. For ignition system tests, refer to the coil failure DTCs in this index. Check the fuel system. Check the CKP sensor circuits. Refer to the relevant service information. Refer to the warranty policy and procedures manual if a module is suspect. |
| Engine cranks and fires, but will not start | Evaporative emissions purge valve Fuel system Spark plugs Ignition coil failure(s) Harness | Check the evaporative emissions purge valve. Check the fuel system. Refer to the relevant service information. Check the spark plug conditions and gaps. For ignition coil tests, refer to the coil failure DTCs in this index. | |
| Difficult to start | Difficult to start hot | Injector leak Fuel system Fuel temperature sensor Intake air temperature (IAT) sensor Mass air flow (MAF) sensor Evaporative emissions purge valve Ignition system | Check the fuel injectors and fuel system. Check the fuel temperature, IAT and MAF sensor circuits. Check the evaporative emissions purge valve. Refer to the relevant service information. For ignition coil tests, refer to the coil failure DTCs in this index. |
| Difficult to start after hot soak (vehicle standing after engine has reached operating temperature) | Injector leak Fuel system Fuel temperature sensor IAT sensor MAF sensor Evaporative emissions purge valve Ignition system | Check the fuel injectors and fuel system. Check the fuel temperature, IAT and MAF sensor circuits. Check the evaporative emissions purge valve. For ignition coil tests, refer to the coil failure DTCs in this index. Refer to the relevant service information. | |
| Engine stalls | Engine stalls soon after start | Breather system disconnected/restricted ECM relay MAF sensor Ignition system Air filter restricted Air leakage Fuel lines Fuel rail pressure (FRP) sensor | Check the engine breather system. Check the ECM relay operation. Check the MAF sensor circuits. For ignition coil tests, refer to the coil failure DTCs in this index. For intake air system information. Check the fuel lines for leaks/damage. Refer to the relevant service information. |
| Poor driveability | Engine hesitates/poor acceleration | Fuel pump module Fuel lines Injector leak Fuel pressure Air leakage TP sensors Throttle motor Ignition system HO2 sensors Transmission malfunction Restricted pedal travel (carpet, etc) Accelerator pedal position (APP) sensor | Check the fuel pump module operation. Check the fuel lines for leaks/damage. Check the fuel injectors. Check the intake air system for leaks. Check the TP sensor and throttle motor circuits. For ignition coil tests, refer to the coil failure DTCs in this index. Check the EGR valves. Check for DTCs relating to HO2 sensors. For transmission information. Check the accelerator pedal travel. Check the APP sensor circuits. Refer to the relevant service information. |
| Engine backfires | Fuel pump module Fuel lines Air leakage MAF sensor HO2 sensors Ignition system APP sensor | Check the fuel pump module operation. Check the fuel lines for leaks/damage. Check the intake air system for leaks. Check the MAF sensor circuits. Check for DTCs relating to HO2 sensors. For ignition coil tests, refer to the coil failure DTCs in this index. Check the VCT and APP sensor circuits. Refer to the relevant service information. | |
| Engine surges | Fuel pump module Fuel lines MAF sensor Harness TP sensors Throttle motor Ignition system | Check the fuel pump module operation. Check the fuel lines for leaks/damage. Check the MAF sensor, TP sensor and throttle motor circuits, refer to the electrical guides. For ignition coil tests, refer to the coil failure DTCs in this index. |
DTC INDEX
Note. Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system). For a full list of ECM DTCs, refer to DTC index .
| DTC | Description | Possible causes | Action |
|---|---|---|---|
| P030000 | Random Misfire Detected | ECM to ignition coil primary circuit faults (cylinder misfire detected DTCs also logged) Ignition coil failure Spark plug failure/fouled/incorrect gap Fuel delivery pressure (low/high) Fuel injector circuit fault(s) (injector DTCs also logged) Fuel injectors restricted/leaking Fuel injectors continuously open Fuel contamination Cylinder compression low Worn camshaft/broken valve springs Valve clearance adjustment | For ignition coil tests, refer to the coil failure DTCs in this index. Check the spark plug conditions and gaps. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P030100 | Cylinder 1 Misfire Detected | Refer to P030000 possible sources | For ignition coil tests, refer to the guided diagnostic routine ETALQ for this code on the approved diagnostic system. Check the spark plug condition and gap. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P030200 | Cylinder 2 Misfire Detected | Refer to P030000 possible sources | For ignition coil tests, refer to the guided diagnostic routine ETALT for this code on the approved diagnostic system. Check the spark plug condition and gap. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P030300 | Cylinder 3 Misfire Detected | Refer to P030000 possible sources | For ignition coil tests, refer to the guided diagnostic routine ETALR for this code on the approved diagnostic system. Check the spark plug condition and gap. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P030400 | Cylinder 4 misfire detected | Refer to P030000 possible sources | For ignition coil tests, refer to the guided diagnostic routine ETALU for this code on the approved diagnostic system. Check the spark plug condition and gap. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P030500 | Cylinder 5 misfire detected | Refer to P030000 possible sources | For ignition coil tests, refer to the guided diagnostic routine ETALS for this code on the approved diagnostic system. Check the spark plug condition and gap. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P030600 | Cylinder 6 misfire detected | Refer to P030000 possible sources | For ignition coil tests, refer to the guided diagnostic routine ETALV for this code on the approved diagnostic system. Check the spark plug condition and gap. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P030700 | Cylinder 7 misfire detected | Refer to P030000 possible sources | For ignition coil tests, refer to the guided diagnostic routine ETAME for this code on the approved diagnostic system. Check the spark plug condition and gap. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P030800 | Cylinder 8 misfire detected | Refer to P030000 possible sources | For ignition coil tests, refer to the guided diagnostic routine ETAMF for this code on the approved diagnostic system. Check the spark plug condition and gap. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P031600 | Misfire Detected On Startup (First 1000 Revolutions) | Misfire detected on first 1000 revs Refer to P030000 possible sources | Carry out the tests indicated for a normal misfire code, but on a cold engine. |
| P035100 | Ignition Coil A Primary/Secondary Circuit | ECM to ignition module/coil drive circuit high resistance, short circuit to ground Ignition module/coil ground circuit high resistance Ignition module/coil battery supply circuit high resistance (including relay, if installed) | Refer to the electrical guides and check the ignition coil circuits. For ignition system tests, refer to the relevant service information. Refer to the guided diagnostic routine ETALQ for this code on the approved diagnostic system. |
| P035200 | Ignition Coil B Primary/Secondary Circuit | ECM to ignition module/coil drive circuit short circuit to ground, high resistance Ignition module/coil ground circuit high resistance Ignition module/coil battery supply circuit high resistance (including relay, if installed) | Refer to the electrical guides and check the ignition coil circuits. For ignition system tests, refer to the relevant service information. Refer to the guided diagnostic routine ETALT for this code on the approved diagnostic system. |
| P035300 | Ignition Coil C Primary/Secondary Circuit | ECM to ignition module/coil drive circuit short circuit to ground, high resistance Ignition module/coil ground circuit high resistance Ignition module/coil battery supply circuit high resistance (including relay, if installed) | Refer to the electrical guides and check the ignition coil circuits. For ignition system tests, refer to the relevant service information. Refer to the guided diagnostic routine ETALR for this code on the approved diagnostic system. |
| P035400 | Ignition Coil D Primary/Secondary Circuit | ECM to ignition module/coil drive circuit short circuit to ground, high resistance Ignition module/coil ground circuit high resistance Ignition module/coil battery supply circuit high resistance (including relay, if installed) | Refer to the electrical guides and check the ignition coil circuits. For ignition system tests, refer to the relevant service information. Refer to the guided diagnostic routine ETALU for this code on the approved diagnostic system. |
| P035500 | Ignition Coil E Primary/Secondary Circuit | ECM to ignition module/coil drive circuit short circuit to ground, high resistance Ignition module/coil ground circuit high resistance Ignition module/coil battery supply circuit high resistance (including relay, if installed) | Refer to the electrical guides and check the ignition coil circuits. For ignition system tests, refer to the relevant service information. Refer to the guided diagnostic routine ETALS for this code on the approved diagnostic system. |
| P035600 | Ignition Coil F Primary/Secondary Circuit | ECM to ignition module/coil drive circuit short circuit to ground, high resistance Ignition module/coil ground circuit high resistance Ignition module/coil battery supply circuit high resistance (including relay, if installed) | Refer to the electrical guides and check the ignition coil circuits. For ignition system tests, refer to the relevant service information. Refer to the guided diagnostic routine ETALV for this code on the approved diagnostic system. |
| P035700 | Cylinder 7 ignition coil primary/secondary circuit | ECM to ignition module/coil drive circuit: high resistance, short circuit to ground Ignition module/coil ground circuit: high resistance Ignition module/coil battery supply circuit: high resistance (including relay, if installed) | Refer to the electrical guides and check the ignition coil circuits. For ignition system tests, refer to the relevant service information. Refer to the guided diagnostic routine ETAME for this code on the approved diagnostic system. |
| P035800 | Cylinder 8 ignition coil primary/secondary circuit | ECM to ignition module/coil drive circuit: high resistance, short circuit to ground Ignition module/coil ground circuit: high resistance Ignition module/coil battery supply circuit: high resistance (including relay, if installed) | Refer to the electrical guides and check the ignition coil circuits. For ignition system tests, refer to the relevant service information. Refer to the guided diagnostic routine ETAMF for this code on the approved diagnostic system. |
| P131500 | Persistent Misfire | ECM to ignition coil primary circuit fault (cylinder misfire detected DTC also flagged) Ignition coil failure Spark plug failure/fouled/incorrect gap Fuel delivery pressure low Fuel injector circuit fault(s) (injector DTCs also flagged) Cylinder compression low | For ignition coil tests, refer to the coil failure DTCs in this index. Check the spark plug conditions and gaps. Check the fuel pressure, check for fuel injector DTCs and refer to the relevant service information. |
| P136700 | Ignition Spare | Ignition coil group A monitoring circuit to ECM high resistance, short circuit to ground, short circuit to power Ignition module/coils ground circuit fault, right hand bank | Refer to the electrical guides and check the ignition monitoring circuit between the ignition coils and ECM. Repair as necessary. For ignition coil tests, refer to the coil failure DTCs in this index. |
| P136800 | Ignition Spare | Ignition coil group B monitoring circuit to ECM high resistance, short circuit to ground, short circuit to power Ignition module/coils ground circuit fault left hand bank | Refer to the electrical guides and check the ignition monitoring circuit between the ignition coils and ECM. Repair as necessary. For ignition coil tests, refer to the coil failure DTCs in this index. |
Scheme 3
- Disconnect the battery ground cable. For additional information, refer to: «SPECIFICATIONS»(/land-rover/range-rover-sport/i-2005-2009/remont/charging-system/#battery-mounting-and-cables__specifications) .
- Remove the ignition coil-on-plugs. For additional information, refer to: «IGNITION COIL-ON-PLUG»(/land-rover/range-rover-sport/i-2005-2009/remont/ignition-system/#engine-ignition-v8-sc-42l-petrol) .
- Remove the remaining ignition coil-on-plugs.
- Clean the area surrounding the spark plugs.
- Remove the spark plugs.
INSTALLATION
- Install the spark plugs. Tighten the spark plugs to 25 Nm (18 lb.ft).
- Install the ignition coil-on-plug. For additional information, refer to: «IGNITION COIL-ON-PLUG»(/land-rover/range-rover-sport/i-2005-2009/remont/ignition-system/#engine-ignition-v8-sc-42l-petrol) .
- Install the remaining coil-on-plugs.
- Connect the battery ground cable. For additional information, refer to: «SPECIFICATIONS»(/land-rover/range-rover-sport/i-2005-2009/remont/charging-system/#battery-mounting-and-cables__specifications) .
Scheme 4
Scheme 5
- Disconnect the battery ground cable. For additional information, refer to: «SPECIFICATIONS»(/land-rover/range-rover-sport/i-2005-2009/remont/charging-system/#battery-mounting-and-cables__specifications) .
- Remove the engine cover. For additional information, refer to: «ENGINE COVER V8 S/C 4.2L PETROL»(/land-rover/range-rover-sport/i-2005-2009/remont/exteriorinterior-trim/#interior-trim-and-omamentation) .
- Remove the ignition coil cover. Release from the 2 clips.
- Disconnect the ignition coil-on-plug electrical connector.
- Remove the ignition coil-on-plug. Remove the bolt. Remove and discard the seal.
- To install, reverse the removal procedure. Tighten the bolt to 6 Nm (4 lb.ft).