Checking continued coolant circulation relay J151: Audi A6 C5 4.2 (BCY, BRV)

🧭 Before you start

Fits: Audi A6 C5 (4B)

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• The test must be carried out within 15 minutes after switching off ignition.
• The positive supply to the continued coolant circulation relay J151 comes from the Motronic current supply relay J271. The voltage supply is maintained for at least 15 minutes after the ignition is switched off.
• The earth supply to continued coolant circulation relay J151 comes from alternator terminal 61 (with the engine stopped).

🔧 Engine codes this applies to

📋 Procedure

1. Switch off ignition. [Note: The test must be carried out within 15 minutes after switching off ignition.]
2. Detach rubber seal from plenum chamber cover in direction of (arrow).
3. Detach plenum chamber cover (1) towards the front.
4. Remove cover for electronics box in plenum chamber (arrows).
5. Unplug continued coolant circulation relay J151 from position (2).

6. Connect multimeter (voltage measurement range) as follows:
7. Repair open circuit or short circuit in wiring (refer to current flow diagram). [Note: The positive supply to the continued coolant circulation relay J151 comes from the Motronic current supply relay J271. The voltage supply is maintained for at least 15 minutes after the ignition is switched off.]
8. Connect multimeter (voltage measurement range) as follows:
9. Perform the following checks marked with a dot. [Note: The earth supply to continued coolant circulation relay J151 comes from alternator terminal 61 (with the engine stopped).]
10. Connect multimeter (voltage measurement range) as follows:
11. Start engine.
12. Check wiring from continued coolant circulation relay J151 to alternator terminal 61 for open circuit.
13. Renew continued coolant circulation relay J151.

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