A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
Turbo Boost Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Charge Air Pressure Sensor -G31-, Checking
Special tools and equipment
-
VAG 1526 A Multimeter or equivalent
-
VAG 1594 A Connector test set
-
VAG 1598/31 Adapter
-
VAS 5051 Vehicle Diagnostic, Testing and Information System VAS 5051 with VAS 5051/1
or
-
VAG 1551 Scan Tool with VAG 1551/3 A
Requirement
-
Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool must be connected.
Work sequence
NOTE: The Charge air pressure sensor -G31- and its wiring are monitored by the 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
-
Disconnect connector (arrow) on charge air pressure sensor.
-
Connect multimeter and measure voltage between contacts 1 and 3 of connector.
-
Switch on ignition.
Specification: approx. 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 following wiring:
Connector
Test box VAG 1598/31 socket
contact
1
108
3
98
-
If necessary, eliminate open circuit/short circuit.
If measured value matches specification:
Checking signal wiring
-
Connect connector for charge air pressure sensor.
-
Connect multimeter and measure voltage at sockets 101 and 108 of test box.
-
Start engine and let it idle.
Specification: approx. 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 following wiring connection:
Connector
Test box VAG 1598/31
contact
socket
4
101
-
If necessary, eliminate open circuit/short circuit.
If wiring is OK: