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Home >> Land Rover >> 2012 >> LR4 HSE Lux >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel Tank And Lines >> Fuel Tank And Lines (V8 5.0L Petrol) >> Diagnostic Procedures >> Fuel Tank And Lines >> Symptom Chart >> Fuel Gauge Diagnosis

Fuel Gauge Diagnosis

  1. Using the manufacturer approved diagnostic system monitor, "active fuel level sensor (A)" and "passive fuel level sensor (B)" data logger signals located within the body control module subsection.
Customer Complaint Possible Concern Fuel Pressure Active Fuel Level Sensor Voltage Reading A Passive Fuel Level Sensor Voltage Reading B Action
Fuel gauge switches on and off intermittently and / or fuel gauge indicates empty whilst there is fuel still available in the fuel tank Open circuit Yes >3.6v >3.6v
  • Refer to the electrical circuit diagrams and check for backed out terminals and circuit faults between,
  • C0390-18 and C0114-1
  • If no fault is evident then check C0376-18 to C0586R-8,
  • If no fault is evident with the above, remove the fuel pump module and two fuel senders from the fuel tank and check for backed out terminals and circuit faults. Refer to the warranty policy and procedures manual if a module/component is suspect
Fuel gauge switches on and off intermittently and / or fuel gauge indicates empty whilst there is fuel still available in the fuel tank Open circuit Yes <3.0v >3.6v
  • Refer to the electrical circuit diagrams and check for backed out terminals and circuit faults between,
  • C0390-2 and C0114-6,
  • If no fault is evident then check C0376-2 to C0586R-20
  • If no fault is evident with the above, remove the fuel sender B (front) from the fuel tank and check for backed out terminals and circuit faults
Fuel gauge switches on and off intermittently and / or fuel gauge indicates empty whilst there is fuel still available in the fuel tank Open circuit Yes >3.6v <3.0v
  • Refer to the electrical circuit diagrams and check for backed out terminals and circuit faults between,
  • C0390-3 and C0114-2
  • If no fault is evident then check C0376-3 to C0586R-21
  • If no fault can be found with the above check then the active fuel sender A (rear) will need to be removed and the wiring carefully inspected
Fuel gauge switches on and off intermittently and / or fuel gauge indicates empty whilst there is fuel still available in the fuel tank Electric parkbrake fault (EPB) Yes 0.35v to 3.06v 0.35v to 3.06v
NOTE: Check for correct EPB operation prior to carrying out the following checks.
NOTE: The EPB module is calibrated to allow fuel gauge correction for varying gradients (via CAN Bus).
  • Refer to the electrical circuit diagrams and check for backed out terminals and circuit faults at connectors,
  • C2178-31, C2178-32
  • C2178-9,
  • C2178-10,
  • C2178-15 and C2178-16
  • Check Earth Point (LH D Post) C2570S (Discovery 4/LR4) C2570T (Range Rover Sport)
Fuel gauge indicating fuel present No fuel present inside tank No 0.35v to 3.06v 0.35v
  • Check active sender A (rear) for potential hang up/fouling inside of the fuel tank
Fuel gauge indicating fuel present No fuel present inside tank No 0.35v 0.35v to 3.06v
  • Check passive sender B (front) for potential hang up/fouling inside of the fuel tank
Fuel gauge indicating fuel present No fuel present inside tank No >1.0v 0.35v to 0.54v
  • Remove from the fuel tank and check all active sender A (rear) blue wires for backed out pin/defective wire
Fuel gauge indicating fuel present No fuel present inside tank No 0.35v to 0.44v >1.0v
  • Remove from the fuel tank and check all passive sender B (front) blue circuit wires for backed out pin/defective wire
Fuel gauge indicating fuel present No fuel present inside tank No >0.55v and within 0.6v of B >0.55v and within 0.6v of A
  • Remove fuel pump module and both senders from the fuel tank and check all black wires on the circuit for backed out pin/defective wire
Fuel gauge indicating fuel present No fuel present inside tank No >3.2v but <3.6v 0.35v to 0.54v
  • Active sender A (rear) internal fault. No repair possible, replace the sender. Refer to the warranty policy and procedures manual if a module/component is suspect
Fuel gauge indicating fuel present No fuel present inside tank No 0.35v to 0.44v >3.2v but <3.6v
  • Passive sender B (front) internal fault. No repair possible, replace the sender. Refer to the warranty policy and procedures manual if a module/component is suspect
Fuel gauge indicating fuel present Fuel present inside the fuel tank No 0.35v to 3.06v 0.35v to 3.06v
  • Check the pressure relief valve inside fuel tank. Check Internal fuel feed pipe is connected to flange
Fuel gauge indicating fuel present Fuel present inside the fuel tank Yes 0.35v to 3.06v 0.35v to 3.06v
  • Check terminals are correctly latched / installed to the fuel pump module
Fuel gauge indicating fuel present but reading an incorrect fuel level Fuel present inside the fuel tank Yes 0.35v to 3.06v 0.35v to 3.06v
  • Check the bayonet fitting on the fuel pump module. Check both the active and passive fuel senders are securely located in their brackets
Fuel gauge indicating fuel present but reading an incorrect fuel level Fuel tank - out of shape / sucking in (diesel only) Yes 0.35v to 3.06v 0.35v to 3.06v
  • Incorrect filler cap installed. Install the correct fuel filler cap (applies to diesel variants only). Refer to the warranty policy and procedures manual if a module/component is suspect
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