Land Rover Discovery: Exhaust - Ingenium i4 2.0l Diesel Exhaust System DTC- Selective Catalytic Reduction (SCR) / Diagnosis and Testing

PRINCIPLE OF OPERATION

For a detailed description of the Exhaust System, refer to the relevant Description and Operation section of the workshop manual.

REFER to: Selective Catalyst Reduction (309-00C Exhaust 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 accurate to three decimal places, and with an up-todate calibration certificate. 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 malfunction lamp illuminated

Or

• Reagent indicator (17MY on)

POSSIBLE CAUSES:

• Selective catalyst reduction system failure
• Diesel exhaust fluid level too low
• Power or ground failure
• Diesel exhaust fluid pressure too low
• Diesel exhaust fluid pressure too high
• Diesel exhaust fluid injection pump
• Diesel exhaust fluid injector
• Diesel exhaust fluid relay
• Diesel exhaust fluid heater control unit
• Pre selective catalytic reduction NOx sensor
• Pre selective catalyst reduction Nox sensor module
• Post selective catalyst reduction NOx sensor
• Post selective catalyst reduction Nox sensor module
• Post selective catalyst reduction soot sensor
• Post selective catalyst reduction soot sensor module
• Diesel sub net CAN communication bus

ACTION:

• Using the manufacturer approved diagnostic system check engine control module for related DTCs and refer to relevant DTC index
• Check and correct the diesel exhaust fluid level
• Refer to the electrical circuit diagrams and check connections are secure and wiring integrity
• Refer to the workshop manual and the battery care manual, inspect the vehicle battery and ensure it is fully charged and serviceable before performing further tests
• Inspect connectors for signs of water ingress, and pins for damage and/or corrosion Refer to the electrical circuit diagrams and check sensor, relays/fuses and control module power feeds and grounds
• Check system for correct installation of components
• Check system mechanical and fluid integrity
• Check system for mechanical integrity
• Check system for leakage
• Check system for blockage

SYMPTOM:

Engine will not crank

POSSIBLE CAUSES:

• Vehicle battery failure
• Diesel exhaust fluid level too low
• Harness failure - Wiring integrity

ACTION:

• Refer to the workshop manual and the battery care manual, inspect the vehicle battery and ensure it is fully charged and serviceable before performing further tests
• Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
• Check and correct the diesel exhaust fluid level
• Using the manufacturer approved diagnostic system carry out any required routines

SYMPTOM:

Message warning

POSSIBLE CAUSES:

• Selective catalyst reduction system failure
• A monitor of the historical diesel exhaust fluid consumption rate, allied with a direct reading of the diesel exhaust fluid level in the tank, predicts that the distance to emptying the tank is less than 2400km

ACTION:

• Using the manufacturer approved diagnostic system check engine control module for related DTCs and refer to relevant DTC index
• Check and correct the diesel exhaust fluid level

Control Module Cavity

DIAGNOSTIC ROUTINES

PARAMETER IDENTIFIER ( PID )

• Diesel Exhaust Fluid (DEF) Level / Quality.16 MY EU  A 16 MY NAS  A
• Diesel Exhaust Fluid ( DEF ) Level 16 MY EU   B 17 MY EU  B
• Diesel Exhaust Fluid ( DEF ) Quality. 16 MY NAS   B - 17 MY NAS  B
• Diesel Exhaust Fluid

Exhaust - Ingenium i4 2.0l Diesel / Description and OperationDiesel Exhaust Fluid (DEF) Level / Quality.16 MY EU  A 16 MY NAS  A

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