Land Rover Discovery: Glow Plug System - Ingenium i4 2.0l Diesel / Diagnosis and Testing

PRINCIPLES OF OPERATION

For a detailed description of the Glow Plug System, refer to the relevant Description and Operation section in the workshop manual. REFER to: Glow Plug System (303-07B Glow Plug System - INGENIUM I4 2.0L Diesel, Description and Operation).

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 tested and/or the donor vehicle

NOTES:

• If a control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component.
• When performing voltage or resistance tests, always use a digital multimeter that has the resolution ability to view 3 decimal places.

  For example, on the 2 volts range can measure 1mV or 2 K Ohm range can measure 1 Ohm. When testing resistance always take the resistance of the digital multimeter leads into account.

• Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

1. Verify the customer concern
2. Visually inspect for obvious signs of damage and system integrity

Visual Inspection

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
4. 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
5. Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as required

SYMPTOM CHART

SYMPTOM:

Engine difficult to start (in extreme cold ambient temperature)

POSSIBLE CAUSES:

• Engine system fault
• Glow plugs circuit short circuit to ground, short circuit to power, open circuit, high resistance
• Glow plugs inoperative/inefficient Fuel temperature too low (causing waxing)

ACTION:

• Using the Jaguar Land Rover approved diagnostic equipment, check the powertrain control module for related DTCs and refer to the relevant DTC index
• Refer to the electrical circuit diagrams and check the glow plugs circuit for short circuit to ground, short circuit to power, open circuit, high resistance
• Check the operation of the glow plugs.

  GO to Pinpoint Test A.

• The fuel system recycles fuel until operating temperature is reached to reduce this possibility

SYMPTOM:

High cold engine emissions

POSSIBLE CAUSES:

• Engine system fault
• Glow plug after-glow phase inoperative

ACTION:

NOTE:

The glow plug after-glow phase is designed to function at engine temperatures below 50ºC (122ºF), and below 2500 rpm.

• Using the Jaguar Land Rover approved diagnostic equipment, check the powertrain control module for related DTCs and refer to the relevant DTC index
• Check the operation of the glow plugs.

  GO to Pinpoint Test A.

SYMPTOM:

High coldengine noise, vibration or harshness

POSSIBLE CAUSES:

• Engine system fault
• Glow plug after-glow phase inoperative

ACTION:

NOTE:

The glow plug after-glow phase is designed to function at engine temperatures below 50ºC (122ºF), and below 2500 rpm.

• Using the Jaguar Land Rover approved diagnostic equipment, check the powertrain control module for related DTCs and refer to the relevant DTC index
• Check the operation of the glow plugs.

  GO to Pinpoint Test A.

PINPOINT TESTS

NOTE:

Before starting the measurement procedure operators must ensure equipment is calibrated in date and work area is clean

DTC INDEX

For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Section 100-00. REFER to: Diagnostic Trouble Code Index - INGENIUM I4 2.0L Diesel, DTC: Engine Control Module (ECM) B10A2-07 to P034B-76 (100-00 General Information, Description and Operation).

Glow Plug System - Ingenium i4 2.0l Diesel Specifications

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