A4 Quattro Turbo Boost Sensor - Fuel and Air Induction Components (2005)
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Using the Multimeter V.A.G 1526 A or equivalent, check the Charge Air Pressure Sensor G31 electrical connector terminals 1+3 for voltage.
Specified value: min. 4.5 V
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Switch ignition off.
If the specification is not obtained:
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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
1
53
3
19
4
38
Specified resistance 1.5 Ohms max.
If the specification is not obtained:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
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Replace Charge Air Pressure Sensor G31.
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.