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Diesel Direct Fuel Injection ECM, Checking






Diesel Direct Fuel Injection ECM, Checking

Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) regulates fuel injection, Throttle Valve Control Module (J338), engine speed limitation through fuel injectors as well as On Board Diagnostic (OBD).

The following table provides quick links to all chapters in this section.





68-Pin Test Box Adapter, VAG1598/19, Installing

Test requirements

• Ignition switched off.

Work procedure

When the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) electrical harness connector is disconnected, the adaptation values are erased and the DTC memory content remains intact.

Procedure

- Remove the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248). Refer to => [ Diesel Direct Fuel Injection ECM, Replacing ].

- Disconnect the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) electrical harness connector.

- Connect the Adapter - 68 Pin (VAG1598/18) to the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) electrical harness connector.

Voltage Supply, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) fuses OK.

• Battery voltage at least 12.5 volts.

• All electrical consumers such as, lights and rear window defroster, switched off.

• Vehicles with automatic transmission, selector lever in position "P" or "N".

• A/C switched off.

• Ground (GND) connections between engine/transmission/chassis OK.

• Ignition switched off.

Test sequence

- Remove the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) Power Supply Relay (J317).

Checking voltage

- Using a Multimeter, check the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) Power Supply Relay (J317) socket 1/30 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained:

- Check the wiring connections from the Battery to the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) Power Supply Relay (J317) socket 1/30 for an open circuit or a short circuit.

- Check the wiring connections for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

- Switch the ignition on.

- Using a Multimeter, check the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) Power Supply Relay (J317) socket 2/87 to Ground (GND).

Specified value: battery voltage.

If the specified value was obtained:

Checking wiring

If the manufacturers test box is being used, perform the following step.

- Install the test box. Refer to => [ 68-Pin Test Box Adapter, VAG1598/19, Installing ].

If the manufacturers test box is not being used, perform the following step.

- Remove the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248). Refer to => [ Diesel Direct Fuel Injection ECM, Replacing ].

- Using a Multimeter, check the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) Power Supply Relay (J317) socket 4/85 to the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) electrical harness connector T94 terminal 49 for resistance.





Specified value: 2.0 ohms Max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring:

Checking activation

- Switch the ignition on.

- Using a Multimeter, check the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) Power Supply Relay (J317) socket 6/87 to the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) electrical harness connector T121 terminal 18 for voltage.





- Switch the ignition off.

Specified value: 0.5 V Max.

If the specified value was obtained:

- Replace the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) Power Supply Relay (J317).

If the specified value was not obtained:

- Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).

- Check the wiring connection for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was not OK:

- Replace the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248). Refer to => [ Diesel Direct Fuel Injection ECM, Replacing ].

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 ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Readiness Code.

Diesel Direct Fuel Injection ECM, Replacing

Removing

• When the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) electrical harness connector is disconnected, the adaptation values are erased and the DTC memory content remains intact.

Work procedure

Check the identification of the previous Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) as follows:

- Connect the scan tool.

- Switch the ignition on.

- Using the scan tool, select "Vehicle information".

- Select " Calibration Identification" in vehicle information.

The electronic control module identification number will be displayed, e.g. 06A906032NA 4983

- Record the electronic control module identification number.

- End diagnosis and switch the ignition off.

Procedure

- Remove the wiper arms.

- Remove cowl panel.

- Disconnect the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) electrical harness connector.





- Press securing tab - arrow- to the left and pull Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) out.

- Remove the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248).

Installation

Installation is performed in reverse order of removal. Note the following:

Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) reprogramming

- The new Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248) and immobilizer must be activated.

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 ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Readiness Code.

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