Golf GL L4-2.0L (AZG) (2001)
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Connect test box VAG1598/31 to control module wiring harness. The engine control module remains disconnected.
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Check wiring for open circuit between test box and 2-pin connectors using wiring diagram.
-G61-:
-G66-:
Contact 1+socket
106
107
Contact 2+socket
99
99
Wire resistance: max. 1.5 Ohms
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Additionally check wires for short to one another.
Specification: Infinity Ohms
If no fault is detected in the pipes:
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Loosen knock sensor and tighten again to 20 Nm.
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Test drive vehicle again.
During the road test the following operating conditions must be fulfilled:
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The coolant temperature must exceed 80°C.
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When the temperature is reached, the operating conditions
Idling
Part throttle
Enrichment
Full throttle
Overrun
must be attained several times.
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At wide open throttle the speed must exceed 3500 RPM.
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Again check the control module DTC memory.
If the malfunction is still present: