Jetta Sedan L5-2.5L (BGP) (2005)
If the manufacturers test box is being used. Perform the following step.
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Install the Adapter Cable (121-pin) (VAG1598/31)24 Removal and Installation.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J220). Refer to --> [ Engine Control Module, Replacing ] See: Service and Repair/Removal
and Replacement/Engine Control Module, Replacing.
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Using a Multimeter, check the Data Bus On Board Diagnostic Interface (J533) electrical harness connector to the Motronic Engine Control
Module (ECM) (J220) electrical harness connector T121 for resistance.
Specified value: 1.5 ohms Max.
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.
If no malfunction is found in the wiring:
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Replace the Data Bus On Board Diagnostic Interface (J533).
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Erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Diagnostic Mode 04 - Erase DTC Memory
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Perform a road test to verify repair.
If the DTC does not return:
Repair complete, Generate readiness code. Refer to --> [ Readiness Code ] See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness
Codes/Readiness Code.
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End of 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) (J220). Refer to --> [ Engine Control Module, Replacing ] See: Service and Repair/Removal
and Replacement/Engine Control Module, Replacing.
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Assembly is performed in the reverse of the removal.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to --> [ Diagnostic Mode 03 - Read DTC Memory ] See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] See: Testing and Inspection/Reading and Clearing
Diagnostic Trouble Codes/Diagnostic Mode 04 - Erase DTC Memory.
3. If the DTC memory was erased, generate readiness code. Refer to --> [ Readiness Code ] See: Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes/Readiness Code.
ECM Voltage Supply, Checking