Jetta GLX Wagon V6-2.8L (AFP) (2001)
Test sequence
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Remove wiper arms and plenum chamber cover.
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Connect VAG1598/31 test box to Engine Control Module (ECM) wiring harness. Engine Control Module (ECM) is not connected by this action.
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Check centralized matching resistor in Engine Control Module (ECM) by measuring resistance between test box sockets 77 + 79.
Specified value: 60-72 ohms
If the resistance measurement is outside the specified range:
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Replace Engine Control Module (ECM). See: Engine Control Module/Service and Repair
If the resistance measurement is within the specified range:
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Disconnect VAG1598/31 test box from Engine Control Module (ECM).
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Connect VAG1598/31 test box to Engine Control Module (ECM) wiring harness. Engine Control Module (ECM) is not connected by this action.
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Disconnect harness connector (arrow) from transmission control module.
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Check CAN-Bus wiring for short to one another.
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Perform resistance measurement again between test box sockets 77 + 79:
Specified value: Infinity ohms
If the specified value is not obtained (wires are shorted together):
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Repair wiring malfunction according to wiring diagram.
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Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
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Display readiness code.
If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code
must be generated again.
If the specified value is obtained (wires are not shorted together):
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Check wiring to CAN-data bus components for short to battery positive or Ground or open circuit using Current flow diagram:
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Check wiring to CAN-Bus for short to battery positive (B+), short to Ground (GND), or open circuit.
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Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
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Display readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code
must be generated again.
Terminal Resistance For CAN-Bus, Checking
Terminal Resistance For CAN-Bus, Checking
Function