Camshaft Position (CMP) Sensor G40 , checking

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Use only gold-plated terminals when servicing terminals in harness connector of Camshaft Position (CMP) Sensor G40.

Special tools, testers and auxiliary items required

Multimeter.
Wiring diagram.

Test requirements

Fig 1: Identifying Main Fuse Panel

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The Motronic Engine Control Module (ECM) J220 fuses OK.
Battery voltage at least 12.5 volts.
All electrical consumers such as, lights and rear window defroster, switched off.
Vehicles with automatic transmission, shift selector lever into position "P" or "N".

A/C switched off.
Ground (GND) connections between engine/transmission/chassis OK.
Ignition switched off.

Procedure

Fig 2: Removing Engine Cover

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Remove the engine cover with air filter → 24 MULTIPORT FUEL INJECTION (MFI) .

Fig 3: Locating Connector At Camshaft Position Sensor G40

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Disconnect the Camshaft Position (CMP) Sensor G40 electrical harness connector - 1 -.
Switch the ignition on.

Fig 4: Identifying 3 Pin Electrical Harness Connector Terminals

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Using a Multimeter , Check the Camshaft Position (CMP) Sensor G40 electrical harness connector terminals 1 to 3 for voltage.

Specified value: about 5.0 V

Switch the ignition off.

If the specification was not obtained:

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to → 24 MULTIPORT FUEL INJECTION (MFI) .

If the manufacturers test box is not being used. Perform the following step.

Remove the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing .

Fig 5: Identifying 3-Pin Electrical Harness Connector & Terminals

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Using a Multimeter , Check the Camshaft Position (CMP) Sensor G40 electrical harness connector to the Motronic Engine Control Module (ECM) electrical harness connector for an open circuit.

Camshaft Position (CMP) Sensor G40 electrical harness connector terminals	Motronic Engine Control Module (ECM) electrical harness test box sockets
1	98
2	86
3	108

Specified value: 1.5 Ω Max.

If the specified value was not obtained:

Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
Check the wiring connection for damage, corrosion, lose or broken terminals.
If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK:

Replace the Camshaft Position (CMP) Sensor G40 → 28 IGNITION/GLOW PLUG SYSTEM .

If no malfunction is found in the wiring and voltage supply was not OK:

Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing .
Install the engine cover with air filter → 24 MULTIPORT FUEL INJECTION (MFI) .

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

Check the DTC memory.
If necessary, erase the DTC memory. Refer to Diagnostic Mode 04: Reset/delete diagnostic data .
If the DTC memory was erased, generate readiness code. Refer to Readiness Code .

End of diagnosis.