90S Quattro (Canada) V6-2.8L (AAH) (1993)
Engine Speed Sensor: Testing and Inspection
Checking Engine Speed Sensor
NOTE:
For functional testing of engine speed sensor, "Read Measuring Value Block" function 08, display group 002.
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Check that sensor is installed correctly.
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Disconnect gray harness connector.
3-Pin Connector
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Connect multimeter (Fluke 83 or equivalent) to terminals 1 and 2 of connector in connector station, using adapter cable VW 1594 connector test
kit.
^
Specified value: approx. 1 K(ohm)
If specified value is NOT obtained:
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Replace engine speed sensor.
If specified value is obtained:
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Connect multi meter to terminals 1 and 3 (Ground) and to terminals 2 and 3 (Ground).
^
Specified value: Infinite ohms in each case (no continuity).
If specified values are not obtained:
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Replace engine speed sensor.
If specified value is obtained, check wiring between sensor connector and ECM as follows:
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Connect VAG 1598 test box with VAG 1598/11 adapter harness to ECM wiring harness. (Adapter harness is not connected to ECM.) See:
Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial
Checks/Connecting VAG 1598/31 Test Box
3-Pin Connector
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Check shielding by checking for continuity between sensor connector terminal 3 and GND.
^
Specified value: maximum 1 (ohm)
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Check GND wire for continuity between sensor connector terminal 1 and test box socket 1.
^
Specified value: maximum 1 (ohm)
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Check signal wire for continuity between sensor connector terminal 2 and test box socket 2.
^
Specified value: maximum 1 ohm