DIAGNOSIS AND TESTING

Inspection and verification

Verify the customer concern.

Visually inspect for obvious mechanical or electrical faults.

Visual inspection

Mechanical	Electrical
Coolant leaks Coolant Hoses Coolant expansion tank Radiator Heater core Accessory drive belt Viscous fan	Fuses Fuse 7E, engine compartment Harnesses Loose or corroded connector(s) Engine coolant temperature (ECT) sensor Engine oil temperature (EOT) sensor Viscous fan solenoid Environmental box (E-Box) fan

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

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.

Symptom chart

Symptom	Possible cause	Action
Coolant loss	Hoses Hose connections Radiator Water pump Heater core Gaskets Engine casting cracks Engine block core plugs	Carry out a visual inspection. If there are no obvious leaks, carry out a pressure test using your workshop tester. Rectify as necessary.
Overheating	Low/Contaminated coolant Thermostat Viscous fan Engine coolant temperature (ECT) sensor Restricted air flow over the radiator	Check the coolant level and condition. Carry out a pressure test using your workshop tester. Rectify as necessary. Check the thermostat and rectify as necessary. Check the viscous fan operation, make sure the viscous fan rotates freely. Check for obstructions to the air flow over the radiator. Rectify as necessary.
Engine not reaching normal temperature	Thermostat Viscous fan Thermostat Electric fan Fan speed module	Check the thermostat operation. Check the viscous fan operation, make sure the viscous fan is not seized. Rectify as necessary.

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 engine control module (ECM) DTCs. REFER to: Electronic Engine Controls (303-14 Electronic Engine Controls - 3.6L (TdV8) Diesel, Diagnosis and Testing).

DTC	Description	Possible causes	Action
P011626	Engine coolant temperature (ECT) sensor circuit range/performance - signal rate of change below threshold	ECT sensor circuit: intermittent high resistance ECT sensor fault	Check the ECT sensor and circuits. Refer to the electrical guides. With the engine cold, read the coolant temperature sensor using a datalogger function and start the engine. Record the value and allow the engine to idle for 20 minutes. After 20 minutes, recheck the value. If the value has not increased by more than 10 °C, install a new sensor. REFER to: Engine Coolant Temperature Sensor (303-14D Electronic Engine Controls - TDV8 3.6L Diesel, Removal and Installation). Clear the DTCs and test for normal operation.
P011716	Engine coolant temperature (ECT) sensor circuit low input - voltage below threshold	ECT sensor circuit: short circuit to ground ECT sensor fault	Check the ECT sensor and circuits. Refer to the electrical guides. Measure the resistance of the sensor. Nominal resistance at 20 °C (68 °F) should be between 35.47 and 39.21 Kohms. If the resistance is outside this range, install a new sensor. REFER to: Engine Coolant Temperature Sensor (303-14D Electronic Engine Controls - TDV8 3.6L Diesel, Removal and Installation). Clear the DTCs and test for normal operation.
P011817	Engine coolant temperature (ECT) sensor circuit high input - voltage above threshold	ECT sensor circuit: short circuit to power ECT sensor fault	Check the ECT sensor and circuits. Refer to the electrical guides. Measure the resistance of the sensor. Nominal resistance at 20 °C (68 °F) should be between 35.47 and 39.21 Kohms. If the resistance is outside this range, install a new sensor. REFER to: Engine Coolant Temperature Sensor (303-14D Electronic Engine Controls - TDV8 3.6L Diesel, Removal and Installation). Clear the DTCs and test for normal operation.
P011927	Engine coolant temperature (ECT) sensor circuit intermittent/erratic - signal rate of change above threshold	ECT sensor circuit: intermittent high resistance ECT sensor fault	Check the ECT sensor and circuits. Refer to the electrical guides. Start the engine and allow to warm up. Read the coolant temperature using a datalogger function and record the value. Increase the engine speed to 2,000 rpm and recheck the value after two minutes at this engine speed. If the value has increased faster than 5 °C per second, install a new sensor. REFER to: Engine Coolant Temperature Sensor (303-14D Electronic Engine Controls - TDV8 3.6L Diesel, Removal and Installation). Clear the DTCs and test for normal operation.
P019626	Engine oil temperature (EOT) sensor circuit range/performance- signal rate of change below threshold	EOT sensor circuit: intermittent high resistance EOT sensor fault	Check the EOT sensor and circuits. Refer to the electrical guides. From cold, start the engine and check the oil temperature using a datalogger function. Allow the engine to idle for ten minutes and recheck the oil temperature. If the value has not increased by more than 5 °C in this time, install a new sensor. Clear the DTCs and test for normal operation.
P019716	Engine oil temperature (EOT) sensor circuit low input - voltage below threshold	EOT sensor circuit: short circuit to ground EOT sensor fault	Check the EOT sensor and circuits. Refer to the electrical guides. Rectify as necessary.
P019817	Engine oil temperature (EOT) sensor circuit high input - voltage above threshold	EOT sensor circuit: short circuit to power EOT sensor fault	Check the EOT sensor and circuits. Refer to the electrical guides. Rectify as necessary.
P019927	Engine oil temperature (EOT) sensor circuit intermittent - signal rate of change above threshold	EOT sensor circuit: intermittent high resistance EOT sensor fault	Check the EOT sensor and circuits. Refer to the electrical guides. Start the engine and allow to idle. Check the oil temperature using a datalogger function. Increase the engine speed to 2,000 rpm and recheck the value after two minutes at this engine speed. If the value has increased by more than 40 °C per second, install a new sensor. Clear the DTCs and test for normal operation.
P048011	Fan 1 control circuit	Cooling fan control circuit: short circuit to ground Cooling fan fault	Check the cooling fan and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation.
P048012	Fan 1 control circuit	Cooling fan control circuit: short circuit to power Cooling fan fault	Check the cooling fan and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation.
P048013	Fan 1 control circuit	Cooling fan control circuit: high resistance	Check the cooling fan and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation.
P048300	Fan rationality check	Cooling fan control circuit: short circuit to ground Cooling fan control circuit: short circuit to power Cooling fan control circuit: high resistance Cooling fan fault	Check the cooling fan and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation. Check the pulse width modulated (PWM) signal, check the motor for sticking. Rectify as necessary.
P052721	Fan speed sensor circuit range/performance - signal amplitude less than minimum	Fan circuit: short circuit to ground Fan circuit: short circuit to power Fan circuit: high resistance Fan fault	Check the fan and circuits, including the pulse width modulated (PWM) signal circuit. Refer to the electrical guides. Check the motor for sticking. Rectify as necessary. Clear the DTCs and test for normal operation.
P052722	Fan speed sensor circuit range/performance - signal amplitude greater than maximum	Fan circuit: short circuit to ground Fan circuit: short circuit to power Fan circuit: high resistance Fan fault	Check the fan and circuits, including the pulse width modulated (PWM) signal circuit. Refer to the electrical guides. Check the motor for sticking. Rectify as necessary. Clear the DTCs and test for normal operation.
P052727	Fan speed sensor circuit range/performance - signal rate of change above threshold	Sensor signal gradient not plausible	Check the fan and circuits, including the pulse width modulated (PWM) signal circuit. Refer to the electrical guides. Check the motor for sticking. Rectify as necessary. Clear the DTCs and test for normal operation.
P069311	Viscous fan control circuit low - circuit open	Viscous fan control circuit: high resistance Viscous fan solenoid fault	Check the viscous fan solenoid and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation.
P069313	Viscous fan control circuit low - circuit short to ground	Viscous fan control circuit: short circuit to ground Viscous fan solenoid fault	Check the viscous fan solenoid and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation.
P069412	Viscous fan control circuit high - circuit short to battery	Viscous fan control circuit: short circuit to power Viscous fan solenoid fault	Check the viscous fan solenoid and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation.
P150F68	Environmental box (E-Box) cooling fan performance - event information	E-Box fan circuit: short circuit to ground E-Box fan circuit: short circuit to power E-Box fan circuit: high resistance E-Box fan fault Engine control module (ECM) fault	Check the E-Box fan and circuits. Refer to the electrical guides. Rectify as necessary. Clear the DTCs and test for normal operation. Refer to the warranty policy and procedures manual if a module is suspect.

Published: 11-May-2011

2007.0 Range Rover Sport (LS), 303-03E

Engine Cooling - TDV8 3.6L Diesel (G939060)