S4 Quattro Wagon V8-4.2L (BHF) (2008)
If the specified value was not obtained:
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Check the wiring connection from the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical harness connector terminal
1 to the Fuel Pump (FP) Relay ( J17) terminal 2 for an open circuit or short to ground (GND).
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Check the electrical harness connector for damage, corrosion, lose or broken terminals.
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If necessary, repair the wiring connection.
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. Refer to Fuel Injection and Ignition Repair Information.
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, Replacing ] See: Computers and Control
Systems/Engine Control Module/Service and Repair.
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Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical connector terminal 2 to the Engine
Control Module (ECM) ( J623) electrical connector T121 terminal 64 for an open circuit.
Specified value: 1.5 ohms.
If the specification was not obtained:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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Check the electrical harness connector for damage, corrosion, lose or broken terminals.
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If necessary, repair the wiring connection.
If the specification was obtained:
-
Replace the Engine Control Module (ECM) (J623 ). Refer to => [ Engine Control Module, Replacing ] See: Computers and Control
Systems/Engine Control Module/Service and Repair.
Final procedures