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1.4 ltr./44 kW Engine - Mechanical Components > < Testing knock sensor G61

Octavia Mk1

Check engine speed senderG28
Check engine speed sender -G28-
Special tools and workshop equipment required
t  Hand multimeter (e.g. -V.A.G 1526 A-)
t  Adapter cable set (e.g. -V.A.G 1594 A-)
t  Test box -V.A.G 1598/31-
  Note
If the signal of the -G28- fails while the engine is running, the engine will stop immediately. The engine control unit replaces the signal of the engine speed sender -G28- with the signal of the camshaft position sensor -G163-. The engine can be started again and runs in emergency programme.
Test sequence
–  Before testing check the sender for correct installation and tight fit.
   
–  Disconnect the 2-pin connector -2- from the engine speed sender -1-.
–  Connect the handheld multimeter for resistance measurement between contact 1 and 2 to the sender -1-.
   Specified value: 400…640 Ω
  Note
The resistance value of the engine speed sender -G28 - applies for a temperature of 20°C. The resistance increases as the temperature rises.
If the specified value is not reached:
–  Replace engine speed sender.
If the specified value is reached:
  S24-0393
–  Connect the test box -V.A.G 1598/31- to the wiring loom on the engine control unit → Chapter.
  S24-0267
–  Check the following wires for interruption or short-circuit to earth or positive:
  S24-0393
Contact to connector plugTest box -V.A.G 1598/31-, bush 
198 
2106

–  If necessary eliminate wire interruption or short-circuit.
–  Additionally check contacts 1 and 2 on bush 99 (shielding) for short-circuit.
If the lines are not found to be faulty:
–  Replacing engine control unit → Chapter.
   

1.4 ltr./44 kW Engine - Mechanical Components > < Testing knock sensor G61