Pinpoint Test B: Coolant Level Sensor Tests

WARNING: This page is about a different car, the 2020 Jaguar XF and 2019 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The coolant expansion tank float is designed to be positioned near the bottom of the tank, significantly (more than 15 mm) below the MIN cold fill level. A float in this position does NOT signify float failure (For example, 'sinking' or 'sticking'). Continue to follow the procedure as stated below.

B1: COOLANT LEVEL SENSOR TEST 1 - COOLANT LEVEL CHECK
WARNING:
- DO NOT remove the coolant expansion tank cap when the engine is hot. Failure to follow this instruction may result in personal injury.
- Never, under any circumstances, remove the coolant expansion tank pressure cap while the engine is operating. To avoid having scalding hot water or steam blow out of the cooling system, use extreme care when removing the coolant expansion tank pressure cap from a hot cooling system. Wait until the engine has cooled, then wrap a thick cloth around the coolant expansion tank pressure cap and turn it slowly until the pressure begins to release, step back while the pressure is released from the system. When certain all the pressure has been released (still with a cloth) turn and remove the coolant expansion tank pressure cap. Failure to follow these instructions may result in damage to the cooling system, engine and/or cause personal injury.
1. Check the coolant level
Is the coolant level within specification?

Yes

GO to B2.

No

Refer to the relevant article of the repair information and fill and bleed the cooling system as necessary. Check for coolant loss

B2: COOLANT LEVEL SENSOR TEST 2 - SENSOR CIRCUIT CONTINUITY CHECK

Check harness connector is firmly attached to the level sensor. Rectify as required
Uncouple the engine coolant level sensor/switch assembly harness connector. Confirm that the "Coolant Level Low" warning message appears on the instrument cluster when the harness has been disconnected from the engine coolant level sensor/switch assembly

Create a circuit short across the pins of the level sensor harness connector. It is recommended to connect a MICRO blade fuse (of any amp rating, as illustrated) to the pins level sensor harness connector. Alternatively, a suitable jumper wire may be used. Shorting the circuit should make the "Coolant Level Low" warning message disappear

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

If the "Coolant Level Low" warning message does not disappear, using the Jaguar Land Rover approved diagnostic equipment, check the engine coolant level sensor/switch circuit between the coolant expansion tank and the body control module/central junction box for open circuit faults and rectify as required

Is the "Coolant Level Low" message displayed on the instrument cluster when the level sensor harness terminals is short circuited (For example, with a jumper wire or a blade fuse)?

Yes

Repair the harness and repeat Pinpoint Test E2

If this is the first reported instance of the fault, GO to B3.. If this same fault has been previously reported on the vehicle GO to B4.

B3: COOLANT LEVEL SENSOR TEST 3 - SENSOR CIRCUIT CONTINUITY CHECK
1. Replace the level sensor
2. Reconnect the engine coolant level sensor/switch assembly harness connector
Is the "Coolant Level Low" warning message displayed?

Yes

GO to B4.

No

No further action required
B4: COOLANT LEVEL SENSOR TEST 4 - COOLANT EXPANSION TANK REPLACEMENT
1. Replace the coolant expansion tank
2. Refill the coolant expansion tank and visually confirm that the coolant level is between the maximum and minimum marks that are moulded on the coolant expansion tank body
Is the "Coolant Level Low" warning message displayed?

Yes

Check the integrity and security of the wiring harness and circuit connectors. Rectify as required and retest

No

No further action required