Golf L4-1781cc 1.8L SOHC (1987)
Knock Sensor: Testing and Inspection
DIGIFANT II
Knock Sensor - Checking
Requirements
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Engine oil temperature must be a minimum of 80°C (176°F) and radiator cooling tan must come on at least once.
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Ignition timing must be within specifications.
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Connect VW 1367 (ignition switched OFF).
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Start the engine and raise speed to a minimum of 2100 RPM four times, letting the throttle close each time.
Note: This clears the fault memory in the E.C.U. and cancels the hot-start idle increase function. This must be repeated each time the vehicle is
stopped and re-started during the test procedure.
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Disconnect the coolant temperature sensor.
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Increase the engine speed to 2300 ± 50 RPM and record ignition timing.
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Reconnect the coolant temperature sensor.
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Briefly raise engine speed above 3000 RPM to store the knock sensor information in the E.C.U.
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Increase engine speed to 2300 ± 50 RPM and re-check ignition timing.
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Ignition timing must advance by 30° ± 3° from initial setting.
If timing does not advance by 30° ± 3° from initial setting:
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Check knock sensor torque and wiring to Digifant E.C.U. using the wiring diagram.
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Torque: 15 Nm - 25 Nm (11-18 ft-lbs.)
If knock sensor torque and wiring are OK
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Check the engine coolant temperature sensor and wiring to the Digifant E.C.U
If the coolant temperature sensor and wiring are OK:
