Checking electronically controlled cooling system: VW Golf IV / Bora 1.6 (AVU)

🧭 Before you start

Fits: VW Golf IV / Bora (1J)

Don't miss

• The system plausibility is tested. Therefore "“Syst. OK”" can be displayed even though there is an electrical fault with the system.
• If there is a fault with the coolant temperature sender G62 or radiator outlet coolant temperature sender G83 or wiring connections or radiator fan output stages the engine control unit will activate the radiator fan speeds.

🔧 Engine codes this applies to

📋 Procedure

1. Connect fault readerV.A.G 1551 or vehicle system testerV.A.G 1552. Start engine and select engine control unit with "“address word”" 01. Connect fault reader and select engine control unit 01.
2. Press buttons 0 and 8 for function "“Read measured value block”" and confirm entry with Q button.
3. Press buttons 1, 3 and 0 for "“Display group number 130”" and confirm entry with Q button.
4. Read result of system test in display zone 4. Specification: "“Syst. OK”" [Note: The system plausibility is tested. Therefore "“Syst. OK”" can be displayed even though there is an electrical fault with the system.]
5. Read coolant temperature sender values in display zones 1 and 2. Specification: the coolant temperature at the engine outlet (display zone 1) must always be higher than the coolant temperature at the radiator outlet (display zone 2).

6. Change to display group 132 as follows:
7. Allow engine to continue to run at idling speed and observe right bit in display zone 4, specification: "“0”".
8. Read fault memory: 01. [Note: If there is a fault with the coolant temperature sender G62 or radiator outlet coolant temperature sender G83 or wiring connections or radiator fan output stages the engine control unit will activate the radiator fan speeds.]
9. Evaluate the remaining bits in display zone 4 of display group 132: 01Evaluating measured value blocks.
10. Press the → button.
11. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.

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