Jetta L4-1.9L DSL Turbo (BRM) (2006)
(DFI) Engine Control Module (ECM) (J248) electrical harness connector T94 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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Erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] See: Powertrain Management/Computers and Control
Systems/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: Powertrain Management/Computers and Control Systems/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 Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248). Refer to --> [ Diesel Direct Fuel Injection ECM, Replacing
] See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Diesel Direct
Fuel Injection ECM, Checking.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check the DTC memory. --> [ Diagnostic Mode 03 - Read DTC Memory ] See: Powertrain Management/Computers and Control Systems/Testing
and Inspection/Reading and Clearing Diagnostic Trouble Codes/Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. --> [ Diagnostic Mode 04 - Erase DTC Memory ] See: Powertrain Management/Computers and Control
Systems/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. --> [ Readiness Code ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes/Readiness Code.
CAN-Bus Terminal Resistance, TCM to ECM, Checking
CAN-Bus Terminal Resistance, TCM to ECM, Checking
The Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) communicates with all databus capable control modules via a CAN
databus.
These databus capable control modules are connected via two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange
information (messages). Missing information on the databus is recognized as a malfunction and stored.
Trouble-free operation of the CAN-bus requires that it have a terminal resistance. The central terminal resistor is located in the Diesel Direct Fuel
Injection (DFI) Engine Control Module (ECM) (J248).
Special tools, testers and auxiliary items required