S4 Quattro Wagon V8-4.2L (BHF) (2008)
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Using a Multimeter , check the Throttle Drive (for Electronic Power Control (EPC)) G186 at Throttle Valve Control Module J338 electrical
harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T121 terminals for an open circuit.
Throttle Valve Control Module
Motronic Engine Control Module (ECM)
J338 electrical harness
J623 electrical connector T121 terminals
connector terminals
or test box sockets
1
92
2
83
3
117
4
84
5
118
6
91
Specified value: 1.5 Ohms max.
If the specification is not obtained:
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Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
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If necessary, repair the faulty wiring connection.
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Check the electrical harness connector for damage, corrosion, lose or broken terminals.
If no malfunction is detected in the wiring and if the voltage supply was not OK:
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Replace Motronic Engine Control Module (ECM) J623.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. See: Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. See: Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes