Altitude Compensator: Testing and Inspection

ALTITUDE SENSOR CHECKING (5 CYLINDER ONLY)
Perform if differential pressure regulator current is incorrect based on altitude during test
- Remove wiring connector from differential pressure regulator
- Connect adapter VW 1315 All and multimeter US 1119 between differential pressure regulator and wiring connector
- Set multi meter to 200 mA scale
- Remove wiring connector from altitude sensor
Altitude sensor is located near electronic control unit in plenum chamber
- Turn ignition on
Differential pressure regulator current should be 10 +/- 2 mA
- Connect jumper wire between terminals #1 and #2 on sensor plug
- Differential pressure regulator current reads approximately 11 - 14 mA
- Disconnect jumper wire
- Reconnect jumper between terminals #1 and #3
Differential pressure regulator current reads approximately 0 - 4 mA
- If readings are OK, replace altitude sensor and adjust CO
- If readings are not OK, check wiring to control unit
- If wiring is OK, replace control unit