A4 Sedan L4-2.0L Turbo (BPG) (2005)
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Using multimeter V.A.G 1526 B or equivalent, check Engine Speed (RPM) Sensor G28 electrical connector terminals 2+3 for resistance.
Specified value: 730 to 1000 Ohms (at approx. 20 degrees C)
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Using multimeter V.A.G 1526 B or equivalent, check Engine Speed (RPM) Sensor G28 for short circuit between terminals 1 + 2 as well as 1 + 3.
Specified value: 0 Ohms
If specification is not obtained:
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Replace Engine Speed (RPM) Sensor G28.
If specification is obtained:
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Connect the Test Box 105 Pin VAG1598/42 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
52
2
51
3
36
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:
Wires OK: