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.
- Verify the customer concern
- Visually inspect for obvious signs of damage and system integrity
Visual Inspection
![Visual Inspection](images/books/227/index492(12).jpg)
![Visual Inspection](images/books/227/index493(12).jpg)
- If an obvious cause for an observed or reported concern is found,
correct the cause (if possible) before proceeding to the next step
- 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
- 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 CHART](images/books/227/index494(11).jpg)
![SYMPTOM CHART](images/books/227/index495(11).jpg)
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
![Control Module Cavity](images/books/227/index496(11).jpg)
![Control Module Cavity](images/books/227/index497(11).jpg)
![Control Module Cavity](images/books/227/index498(11).jpg)
![Control Module Cavity](images/books/227/index499(11).jpg)
![Control Module Cavity](images/books/227/index41(19).jpg)
DIAGNOSTIC ROUTINES
![DIAGNOSTIC ROUTINES](images/books/227/index42(17).jpg)
![DIAGNOSTIC ROUTINES](images/books/227/index43(17).jpg)
PARAMETER IDENTIFIER ( PID )
![PARAMETER IDENTIFIER ( PID )](images/books/227/index44(17).jpg)
![PARAMETER IDENTIFIER ( PID )](images/books/227/index45(17).jpg)
![PARAMETER IDENTIFIER ( PID )](images/books/227/index46(17).jpg)
READ NEXT:
Diesel Exhaust Fluid (DEF) Level .16 MY EU A 16 MY NAS A
The level of DEF in the tank is checked via the Instrument Cluster (IC) menu.
When selected the message centre displays the appr
The level of DEF in the tank is checked via the Instrument Cluster (IC) menu.
When selected the message centre displays the approximate amount of
DEF remaining, providing an estimated km/miles fi
Diesel Exhaust Fluid (DEF) Quality
Prior to the NOx sensor and the monitoring function becoming operational,
the sensor must have reached its 'dew point'. This is the point where the
moisture cont
SEE MORE:
To prevent accidental or
unauthorised operation, never
leave children or animals
unattended in the vehicle. The
vehicle can be operated when the
Smart key is inside the vehicle.
Note: The operational range of the Smart
key will vary considerably, depending on
atmospheric conditions and interference
TYRE REPAIR KIT
If you are in any doubt regarding
your ability to carry out the
instructions, contact a Retailer/
Authorised Repairer before
attempting the repair.
For vehicles not supplied with a spare
wheel, there will be a tyre repair kit under
the loadspace floor panel.
The tyre repair kit can b