| –
| Connect the test box -V.A.G 1598/31- to the wiring loom on the engine control unit → Chapter. |
| –
| Check the wiring of the knock sensor for short-circuits. |
| If no short-circuit is found: |
| –
| Pull out plug from knock sensor 1 -G61-. |
| –
| Check wiring between test box and knock sensor for interruption according to the current flow diagram. |
|
| Cable resistance: max. 1.5 Ω |
| –
| Measure the resistance between the contacts on the knock sensor. |
| If the lines are not found to be faulty: |
| –
| Slacken knock sensor and then tighten again to 20 Nm. |
|
| During the test drive the following operating conditions must be fulfilled: |
| t
| The coolant temperature should rise beyond 80°C |
| t
| once the temperature is reached, the following operating conditions must be repeated: |
|
| Idling speed
partial load
full load
trailing throttle |
| t
| in case of full load the speed should be increased beyond 3500 rpm-1 |
| –
| Interrogate the fault memory again. |
| If the complaint still exists: |
|
|
|
Note
