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Inspecting misfiring detection (only for engines with identification characters ATZ, AQW, AZF) > < Testing knock sensor G61

Fabia Mk1

Check engine speed senderG28
Check engine speed sender -G28-
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 at increased idling speed.
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
The correct setting of the timing can be checked in measured value block 012 → Chapter.
Test sequence
–  Before testing check the sender for correct installation and tight fit.
   
–  Unplug 2-pin connector -2- from 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:
–  Connect test box -V.A.G 1598/31 - to the wiring loom on the engine control unit → Chapter.
  S24-0397
–  Check the following wires for interruption or short-circuit to earth or positive:
  S24-0397
2-pin plug -2- on wiring loom, contactTest 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:
–  Remove the sender and check flywheel for tight fit, damage and concentricity.
If no fault can be found on the flywheel.
–  Replacing engine control unit → Chapter.
   

Inspecting misfiring detection (only for engines with identification characters ATZ, AQW, AZF) > < Testing knock sensor G61