Camshaft Position Sensor, Checking: Notes

NOTE:

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

Special tools and workshop equipment required

Multimeter.
Wiring diagram.

Test requirements

The Engine Control Module (ECM) - J623- 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 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

-- Disconnect the Camshaft Position (CMP) Sensor -G40- electrical harness connector -2-.

Fig 1: Camshaft Position Sensor Electrical Harness Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Switch the ignition On.

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

Specified value: near 5.0 V

-- Switch the ignition Off.

Checking wiring

-- Remove the Engine Control Module (ECM) -J623-.

-- Using a multimeter, Check the Camshaft Position (CMP) Sensor -G40- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector terminals 1 to 3 for voltage.

Specified value: about 5.0 V

-- Switch the ignition Off.

Continue test according to the following table:

Value	Cause	Test
If the specified value was not obtained:	Open or shorted circuit	Checking wiring
If the specified value was obtained:	Check reference signal circuit	Checking Activation