A6 Sedan V6-2.8L (AHA) (1998)
Camshaft Position Sensor: Testing and Inspection
Camshaft Position (CMP) Sensor -G40-, Checking
Camshaft Position (CMP) Sensor -G40-, Checking
NOTE:
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Camshaft Position (CMP) sensor -G40- is located on Bank 1, front of right (passenger's) engine bank.
Required special tools and test equipment
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VAG 1598/22 test box
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Multimeter US 1119 (Fluke 83 or equivalent)
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VW 1594 connector test kit
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Wiring diagrams
Checking
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Disconnect 3-pin harness connector from Camshaft Position (CMP) sensor -G40-.
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Connect multimeter US 1119 (Fluke 83 or equivalent) to measure voltage across CMP connector terminals 1 (B+) and 3 (Ground), using adapters
from VW 1594 connector test kit.
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Switch ignition on.
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Measure voltage between terminals 1 and 3.
Specified value: 9-14.5 volts
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Switch ignition off.
If voltage is OK:
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Connect VAG 1598/22 test box to Motronic ECM harness connector.Refer to "Scan tool Testing/Scan Tool Connecting and Initial
Checks/Connecting VAG 1598/22 Test Box" See: Computers and Control Systems/Testing and Inspection
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Check wiring for open circuit between ECM/test box and 3-pin harness connector, according to wiring diagram.
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Connector terminal 1 to ECM/test box socket 11
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Connector terminal 2 to ECM/test box socket 44
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Connector terminal 3 to ECM/test box socket 14
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Specified value: max. 1.5 Ohms
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Check wiring for short circuit between ECM/test box and 3-pin harness connector, according to wiring diagram.
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Connector terminal 3 to ECM/test box socket 44
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Connector terminal 3 to ECM/test box socket 11
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Connector terminal 2 to ECM/test box socket 11
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Specified value: Infinity Ohms
If wiring is OK (and voltage across terminals 1 and 3 is OK):
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Replace Camshaft Position (CMP) sensor -G40-.
If wiring is OK (but still no voltage across terminals 1 and 3):
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Carry out adaptation of throttle valve control module to ECM.
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Check readiness code. Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" See: Computers and Control
Systems/Testing and Inspection
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If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. Refer to "Moniters,
Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" See: Computers and Control Systems/Testing and Inspection