Camshaft Position (CMP) Sensor 3 G300, checking

Special tools, testers and auxiliary items required 

• Multimeter.
• Wiring diagram.

Test requirements 

• 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.

Test procedure 

• Perform a preliminary check to verify the customers complaint. Refer to → Preliminary Check .

Start diagnosis 

Fig 1: Disconnecting Electrical Harness Connectors At Camshaft Position (CMP) Sensor -G40- And Camshaft Position (CMP) Sensor 3 -G300-

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Disconnect the Camshaft Position (CMP) Sensor 3 G300 electrical harness connector - 2  -.
• Switch the ignition on.

Fig 2: Checking Camshaft Position Sensor G40 Electrical Harness Connector Terminals 1 To 3 For Voltage

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Using a Multimeter, Check the Camshaft Position (CMP) Sensor 3 G300 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 VAG1598/31. 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 3: Identifying 3-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Using a Multimeter, Check the Camshaft Position (CMP) Sensor 3 G300 electrical harness connector to the Engine Control Module (ECM) electrical harness connector for resistance.

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 electrical harness connector for damage, corrosion, loose 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 3 G300.

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

• Erase the DTC memory. Refer to → Diagnostic Mode 04 - Reset/Delete Diagnostic Data .
• Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to → Readiness Code Description .

• End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

• Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220, Replacing .
• Assembly is performed in the reverse of the removal.

Final procedures 

After 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. Refer to Diagnostic Mode 04 - Reset/Delete Diagnostic Data .
3. If the DTC memory was erased, generate readiness code. Refer to Readiness Code Description .

End of diagnosis.