Charge Air Pressure Sensor -G31-, Checking

Charge air pressure sensor -G31-, checking
Special tools and equipment





^ VAG 1526 A
^ VAG 1594 A
^ VAG 1598/31
^ VAS 5051 with VAS 5051/1
or
^ VAG 1551 with VAG 1551/3 A

Test requirement:
^ Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool must be connected.

Test sequence

Note: Charge air pressure sensor-G31- and its wiring are monitored by engine control module.

^ Read DTC memory of engine control module.
If display shows a DTC relating to charge air pressure sensor-G31-:





Checking power supply
^ Unplug connector -arrow- on charge air pressure sensor.





^ Connect multimeter and measure voltage between contacts 1 and 3 of connector.
^ Switch on ignition.
^ Specification: approximately 5 V
If reading does not match specification:





^ Connect test box VAG 1598/31 to engine control module wiring harness. Engine control module must also be connected.








^ Check for open circuit and short to Ground/positive in the following wiring:
^ If necessary, eliminate open circuit/short circuit.
If measured value matches specification:

Checking signal wiring
^ Plug in connector on charge air pressure sensor.
^ Connect multimeter and measure voltage at sockets 101 and 108 of test box.
^ Start engine and leave it idling.
^ Specification: approximately 1.90 V
^ Increase engine speed by quickly depressing accelerator pedal.
^ Specification: 2.00 to 3.00 V
If readings do not match specifications:








^ Check for open circuit and short to Ground/positive in the following wiring connection:
^ If necessary, eliminate open circuit/short circuit.
If wiring is OK:
^ Replace charge air pressure sensor -G31-.