90CS Quattro V6-2.8L (AAH) (1994)
Crankshaft Position Sensor: Testing and Inspection
Checking Crankshaft Position Sensor
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Check that sensor is tight (properly torqued).
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Disconnect black CKP sensor harness connector.
3-Pin Connector
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Connect multimeter (Fluke 83 or equivalent) to harness connector terminals 1 and 2 (in connector holder) with adapter cable from VW 1594
connector test kit.
^
Specified value: approx. 1 K(ohms)
If specified values are not obtained:
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Replace CKP sensor.
If specified value is obtained:
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Connect multimeter first between terminals 1 and 3 (GND) and then between terminals 2 and 3 (GND).
^
Specified value: infinite ohms in each case (no continuity).
If specified values are not obtained:
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Replace CKP sensor.
If specified value is obtained, check wiring between sensor harness connector and Engine Control Module (ECM) as follows:
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Connect VAG 1598 test box with VAG 1598/11 adapter harness to ECM wiring harness. See: Powertrain Management/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
^
Adapter harness is not connected to ECM.
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Check for continuity and/or short circuit using wiring diagram.
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 wiring for continuity between sensor connector terminal 1 and test box socket 5.
^
Specified value: maximum 1 (ohm)
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Check signal wire for continuity between sensor connector terminal 2 and test box socket 4.
^
Specified value: maximum 1 (ohm)
If specified values are not obtained:
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Repair short and/or break in wiring between sensor connector and ECM connector -C- and/or Ground (GND).