Passat GLX V6 V6-2.8L (ATQ) (2001)
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Connect VAG 1598/31 test box to Engine Control Module (ECM). Control module wiring harness is not connected.
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Test central termination resistor in Engine Control Module (ECM):
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To do this, measure resistance between test box
sockets 58 + 60 and
sockets 77 + 79.
Specification: 60 - 72 Ohms
If resistance value is not in expected range:
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Replace Engine Control Module (ECM).
If resistance value is in expected range:
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Remove VAG 1598/31 test box from Engine Control Module (ECM).
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Connect VAG 1598/31 test box to control module wiring harness.
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Check CAN data bus wires for shorts among one another:
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To do this, measure resistance between test box sockets 58 + 60:
Expected value: infinity Ohms
If expected value is obtained (no shorts in wiring):
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Eliminate error in wiring (see wiring diagram):
If expected value is obtained (shorts in wiring):
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Eliminate error in wiring (see wiring diagram).
Terminal Resistance For CAN-Bus, Checking
Terminal resistance for CAN-Bus, checking