A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
Specified value: 20 to 25 Ohms (at approx. 20 degrees C).
If the specification is not obtained:
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Replace Wastegate Bypass Regulator Valve N75.
If the specification is obtained:
Checking Resistance
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Connect the test box 1598/42 to the wiring harness of the Engine Control Module (ECM) J623.
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Using the Test Box 105 Pin VAG1598/42 and Multimeter V.A.G 1526 A or equivalent, check the following wiring connection for an open circuit.
Terminal
Test box socket
2
4
Specified value: Wire resistance max 1.5 Ohms.
If the specified value is not obtained.
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Repair the wiring connection.
If the specified value is obtained.
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Check the wiring between the electrical connector terminal 1 and Engine Component Power Supply Relay J757 terminal 2 for an open circuit.
Specified value: Wire resistance max 1.5 Ohms.
If the specified value is not obtained.
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Repair the wiring connection.
If the specified value is obtained.
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Replace the Engine Control Module (ECM) J623.
Assembly is performed in the reverse order of the removal, note the following:
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.
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End diagnosis and switch the ignition off.