Published: 11-May-2011

2007.0 Range Rover Sport (LS), 303-06D

Starting System - TDV8 3.6L Diesel (G939064)

DIAGNOSIS AND TESTING

Overview

For information on the operation of the system: REFER to: Starting System (303-06 Starting System - 3.6L (TdV8) Diesel, Description and Operation).

Inspection and verification

Verify the customer concern.

Visually inspect for obvious mechanical or electrical faults.

Visual inspection

Mechanical	Electrical
Gear selector lever cable adjustment (vehicles with automatic transmission) Starter motor Engine (turns freely)	Battery Fuses Link 14E, engine compartment junction box Megafuse Starter relay Wiring harness(es) Damaged, loose or corroded connectors Ignition switch Generator 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.

Symptom chart

Symptom	Possible causes	Action
The engine does not crank (starter motor does not turn)	Gear selector not in P or N position (vehicles with automatic transmission) Battery Starter relay Output circuit: high resistance Output circuit: short circuit to power Invalid key code received by central junction box (CJB) Harness/Connectors Starter motor Ignition switch Generator Engine seized	Make sure the gear selector is in the P or N position and correctly adjusted. REFER to: Selector Lever Cable Adjustment (307-05A Automatic Transmission/Transaxle External Controls - V8 S/C 4.2L Petrol, General Procedures), Selector Lever Cable Adjustment (307-05B Automatic Transmission/Transaxle External Controls - V8 N/A 4.4L Petrol, General Procedures), Selector Lever Cable Adjustment (307-05D Automatic Transmission/Transaxle External Controls - TDV8 3.6L Diesel, General Procedures). Check the battery condition and state of charge. Check for DTCs indicating an immobilizer fault. Check the starter motor relay, ignition switch and generator circuits. Refer to the electrical guides. Check that the engine turns freely.
The engine does not crank (starter motor does turn)	Starter motor fitment Starter motor Flywheel/Drive plate ring gear	Check the starter motor fitment (fasteners tight, starter motor square to engine, etc). Check the flywheel/drive plate ring gear teeth for damage, foreign objects, etc.
Engine cranks too slowly	Battery Harness/Connectors Starter motor Oil grade	Check the battery condition and state of charge. Check the starter motor circuits. Refer to the electrical guides. Check the engine oil grade and condition.
Engine cranks too fast	Low engine compression	Check the engine condition and compressions.
Excessive starter motor noise	Starter motor Flywheel/Drive plate ring gear Starter motor fitment/casing	Check the starter motor fitment (fasteners tight, motor square to engine, etc). Check the starter motor casing condition. Check the flywheel/drive plate ring gear teeth for damage, foreign objects, etc.

DTC index

NOTES:

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: Electronic Engine Controls (303-14 Electronic Engine Controls - 3.6L (TdV8) Diesel, Diagnosis and Testing).

DTC	Description	Possible causes	Action
P061712	Starter relay circuit high	Starter relay drive circuit: short circuit to power Starter relay failure	Check the starter circuits. Refer to the electrical guides. Activate the relay and listen for an audible "click". Rectify as necessary. Clear the DTCs and test for normal operation.
P085062	Park/Neutral switch input circuit - signal compare failure	Park/Neutral switch plausibility check Controller area network (CAN) circuit fault	Check the switch and circuits. Refer to the electrical guides. Check for DTCs indicating a CAN fault. Rectify as necessary. Clear the DTCs and test for normal operation.
P085212	Park/Neutral switch input circuit high - circuit short to battery	Park/Neutral switch circuit: short circuit to power	Check the switch and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation.
P125900	Immobilizer to ECM signal error	Incorrect ID received from instrument pack	Check the circuits between the modules. Refer to the electrical guides. Check for network DTCs. Rectify as necessary. Clear the DTCs and test for normal operation. If the DTC resets, contact the technical help desk.
P125987	Immobilizer to ECM signal error - missing message	ECM ID timeout occurred	Check the circuits between the modules. Refer to the electrical guides. Check for network DTCs. Rectify as necessary. Clear the DTCs and test for normal operation. If the DTC resets, contact the technical help desk.
U016700	Lost communication with the vehicle immobilizer control module	ECM ID transfer failed	Check for other CAN DTCs or apparently unrelated customer complaints. Carry out a complete vehicle DTC read. Check the CAN and module power and ground circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation.