Passat Sedan V6-3.6L (BLV) (2008)
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If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) J623.
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Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 85 to the Motronic Engine Control
Module (ECM) J623 electrical harness connector T94 terminal 69 for resistance.
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Ensure key is off
Motronic Engine Control Module
Motronic Engine Control Module
(ECM) Power Supply Relay J271
(ECM) J623 electrical connector
socket terminal
T94 terminal or test box socket
85
69
Specified value: 2.0 Ohms Max.
If the specification was not obtained:
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Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
Checking activation
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Re-install Motronic Engine Control Module (ECM) Power Supply Relay J271
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Switch the ignition on.
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Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 85 to the Motronic Engine Control
Module (ECM) J623 electrical harness connector T94 terminal 69 for voltage.
Motronic Engine Control Module
Motronic Engine Control Module
(ECM) Power Supply Relay J271
(ECM) J623 electrical connector
socket terminal
T121 terminal or test box socket
85
69
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Switch the ignition off.
Specified value: 0.5 V Max.
If the specified value was obtained:
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Replace the Motronic Engine Control Module (ECM) Power Supply Relay J271 : Engine Mechanical, Fuel Injection Ignition.
If the specified value was not obtained:
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Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
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Check the wiring connection for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
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Erase the DTC memory.
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Perform a road test to verify repair.
If the DTC does not return:
Repair complete, Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness
Codes
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End diagnosis.
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
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Replace the Motronic Engine Control Module (ECM) J623.
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Assembly is performed in the reverse of the removal.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes
End of Diagnosis
