A8L Quattro Sedan V8-4.2L (BVJ) (2007)
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check.
Start diagnosis
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Remove the intake manifold.
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Disconnect the brown Knock Sensor 4 (G199) electrical harness connector- 1 -.
Checking internal resistance
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Using a multimeter, check the Knock Sensor 4 (G199) terminals 1 to 2 for an internal short.
Specified value: infinite (Infinity).
If the specified value was not obtained:
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Replace Knock Sensor 4 (G199). Refer to Repair Manual.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Removing and Installing ] See: Powertrain