A6 Quattro Wagon V6-2.8L (AFC) (1995)
Camshaft Position Sensor: Testing and Inspection
CHECKING BATTERY POSITIVE VOLTAGE (B+) SUPPLY
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Connect VAG 1598 test box and VAG 1598/11 adapter harness to the Engine Control Module (ECM) and wiring harness. Refer to VAG
1598 Pin Out Box Connecting. See: Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and
Initial Checks/Connecting and Testing VAG 1598 Pin Out Box
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Connect multimeter (Fluke 83 or equivalent) between test box socket 7 (positive) and Ground (GND).
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Switch ignition ON.
^
Specified value: minimum 9 volts
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Connect multimeter to socket 45 (GND) and socket 7 (positive).
^
Specified value: minimum 9 volts
If one of the specified values is not obtained:
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Connect VAG 1598 test box and VAG 1598/11 adapter harness to engine wiring harness only.
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Check wiring between Camshaft Position (CMP) sensor and ECM for continuity and/or short circuit according to wiring diagram.
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Check for continuity of GND wire from CMP sensor connector terminal 3 to GND.
^
Specified value: maximum 1.0 ohm
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Check positive wire from terminal 1 of CMP sensor connector to test box socket 7 for continuity.
^
Specified value: maximum 1.0 ohm
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Check both wires for short to each othen
If one specified value is not obtained:
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Repair break in wiring and/or short between CMP sensor connector and ECM connector C-.
CMP sensor
ECM connector C
connector terminal
terminal
1 (B+)
7
2 (GND)
GND
If there is neither break in wiring nor short circuit:
-
Replace ECM .
CHECKING FUNCTION
NOTE:
To test CMP sensor function, disconnect the 4-pin harness connector from the ignition coil power output stage, then check DTC memory.
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Check voltage supply to CMP sensor.
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Connect VAG 1598 test box and VAG 1598/11 adapter harness to ECM wiring harness. See: Testing and Inspection/Scan Tool Testing and
Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting and Testing VAG 1598 Pin Out Box
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Connect VAG 1527 voltage tester between test box sockets 8 (CMP sensor signal) and 46 (positive).
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Operate starter a few seconds.
^
LED tester must blink briefly (every 2nd engine revolution).
If the LED tester does not blink:
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Switch ignition off and disconnect 3-pin connector on CMP sensor.
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Check signal wire for continuity from CMP sensor connector terminal 2 and test box socket 8.
^
Specified value: maximum 1.0 ohm
If the specified value is not obtained:
-
Repair short and/or open circuit in wiring between CMP sensor connector and ECM connector C.
CMP sensor
ECM connector C
connector terminal
terminal
2 (signal)
8
If there is no open or short circuit in wiring:
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Connect multimeter (Fluke 83 or equivalent) between test box socket 8 and Ground.
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Switch ignition ON.
^
Specified value: 4.0 volts minimum
If specified value NOT obtained:
^
Replace ECM.
If specified value is obtained:
^
Replace CMP sensor.