Published: 11-May-2011

2007.0 Range Rover Sport (LS), 303-07D

Glow Plug System - TDV8 3.6L Diesel (G939065)

DIAGNOSIS AND TESTING
Overview

For information on the description and operation of the system: REFER to: Glow Plug System (303-07D Glow Plug System - TDV8 3.6L Diesel, Description and Operation).

Inspection and Verification
  1. Verify the customer concern.
  1. Visually inspect for obvious mechanical or electrical faults.

Visual inspection

Electrical
  • Glow plug lamp
  • Fuses
    • Link 1E, engine compartment junction box
    • Link 4E, engine compartment junction box
    • Link 5E, engine compartment junction box
    • Link 6E, engine compartment junction box
  • Glow plug relays
  • Engine management relay
  • Wiring harness(es)/connectors
  • Glow plugs
  • Engine control module (ECM)
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. 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
SymptomPossible causeAction
Poor starting (extreme weather conditions)
  • Glow plugs inoperative/inefficient
  • Fuel temperature too low
    • The fuel system recycles fuel until operating temperature is reached to reduce this possibility
Check the glow plug harnesses at the glow plugs and at the connections to the main harness. Refer to the electrical guides. Check for DTCs indicating a glow plug fault. Rectify as necessary. Clear the DTCs and check for normal operation.
High cold-engine emissions
  • After-glow phase inoperative
Check the glow plug harnesses at the glow plugs and at the connections to the main harness. Refer to the electrical guides. Check for DTCs indicating a glow plug fault. Rectify as necessary. Clear the DTCs and check for normal operation. After-glow is designed to function at engine temperatures below 50 °C (122 °F) and below 2,500 rpm.
High cold-engine noise, vibration or harshness
  • After-glow phase inoperative
Check the glow plug harnesses at the glow plugs and at the connections to the main harness. Refer to the electrical guides. Check for DTCs indicating a glow plug fault. Rectify as necessary. Clear the DTCs and check for normal operation. After-glow is designed to function at engine temperatures below 50 °C (122 °F) and below 2,500 rpm.
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, Diagnosis and Testing).

DTCDescriptionPossible causeAction
P038072Right-hand bank glow plug circuit - actuator stuck open
  • Low battery voltage
  • Relay circuit from relay
Check the battery condition and state of charge. Check the relay and circuits. Refer to the electrical guides. If no fault is found in the circuits, install a new relay. Clear the DTCs and test for normal operation.
P038073Right-hand bank glow plug circuit - actuator stuck closed
  • Low battery voltage
  • Relay circuit to relay
Check the battery condition and state of charge. Check the relay and circuits. Refer to the electrical guides. If no fault is found in the circuits, install a new relay. Clear the DTCs and test for normal operation.
P038311Glow plug control module - control circuit low
  • Glow plug relay control circuit: short circuit to ground
  • Glow plug relay fault
Check the relay and circuits. Refer to the electrical guides. Activate the relay and check for an audible "click". Rectify as necessary. Clear the DTCs and test for normal operation.
P038412Glow plug control module - control circuit high
  • Glow plug relay, control circuit: short circuit to power
  • Glow plug relay fault
Check the relay and circuits. Refer to the electrical guides. Activate the relay and check for an audible "click". Rectify as necessary. Clear the DTCs and test for normal operation.
P067013Glow plug control module - control circuit open
  • Glow plug relay circuits: high resistance
  • Glow plug relay
Check the relay and circuits. Refer to the electrical guides. Activate the relay and check for an audible "click". Rectify as necessary. Clear the DTCs and test for normal operation.