Charge Air Pressure Sensor, Checking: Notes

NOTE:

Use only gold-plated terminals when servicing terminals in harness connector of Charge Air Pressure Sensor -G31-.

Special tools and workshop equipment required

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.
On vehicles with automatic transmission, selector lever in 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

-- Remove the engine cover.

Test sequence

-- Disconnect the Charge Air Pressure Sensor -G31- electrical harness connector -arrow-.

Fig 1: Identifying Charge Air Pressure Sensor G31 Electrical Harness Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Switch the ignition ON.

-- Using a Multimeter, Check the Charge Air Pressure Sensor -G31- 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	Check reference signal