Camshaft Position Sensor 1 G40 Or Sensor 2 G163 Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements

• The Motronic Engine Control Module (ECM) - J623- fuses OK.
  Fig 1: Fuses On E-Box In Engine Compartment, Left Side

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• 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 connections between engine/transmission/chassis OK.
• Ignition switched off.

Test procedure 

-- Observe safety precautions. Refer to SAFETY PRECAUTIONS 

-- Observe Clean Working Conditions. Refer to CLEAN WORKING CONDITIONS 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis 

-- Disconnect the Camshaft Position (CMP) Sensor -- electrical harness connector -10-.

-- Switch the ignition on.

-- Using a multimeter, Check the Camshaft Position (CMP) Sensor 1 -G40- -14- or Camshaft Position (CMP) Sensor 2 -G163- -12- electrical harness connector terminals 1 to 3 for voltage.

Specified value: near 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.

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

-- Remove the Motronic Engine Control Module (ECM) -J623-. Refer to the Repair information.

-- Using a multimeter, Check the Camshaft Position (CMP) Sensor 1 -G40- or Camshaft Position (CMP) Sensor 2 -G163- electrical harness connector to the Motronic Engine Control Module (ECM) electrical harness connector T60 for an open circuit.

Camshaft Position (CMP) Sensor 1 -G40- electrical harness connector terminals	Motronic Engine Control Module (ECM) electrical harness connector T60 terminals or test box sockets
1	26
2	44
3	14

Camshaft Position (CMP) Sensor 2 -G163- electrical harness connector terminals	Motronic Engine Control Module (ECM) electrical harness connector T60 terminals or test box sockets
1	37
2	59
3	14

Specified value: 1.5 Ω Max.

If the specified value was not obtained:

-- Check the wiring connection for an open circuit, high resistance or short circuit to voltage or ground.

-- Check the wiring connection 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 is OK:

-- Replace the Camshaft Position (CMP) Sensor 1 -G40- or Camshaft Position (CMP) Sensor 2 -G163- Refer to the Repair information.

-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Perform a road test to verify repair.

If the DTC does not return:

Generate readiness code. Refer to READINESS CODE .

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

-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to the Repair information.

-- Assembly is performed in the reverse of the removal.

Final procedures 

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

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .