Charge Air Cooling Pump, Checking

Charge Air Cooling Pump, Checking

Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagram.

Test requirements

• The Charge Air Cooling Pump (V188) fuse S10 OK.

• The ignition switched off.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

• The Charge Air Cooling Pump (V188) is located Inside the left front wheel housing

- Charge Air Cooling Pump (V188)

- Disconnect the Charge Air Cooling Pump (V188) electrical harness connector - 2 -.






Checking internal resistance

- Using a Multimeter, check the Charge Air Cooling Pump (V188) for resistance as follows:











If any of the specified values were Not obtained:

- Replace the Charge Air Cooling Pump (V188). Refer to appropriate service manual.

- Go to Final procedures

If the specified values were obtained:

Checking voltage supply

• The voltage for the Charge Air Cooling Pump (V188) is supplied via the Fuse 16 (on fuse panel A) (SA16).

- Check the Charge Air Cooling Pump (V188) for voltage.

- Using a Multimeter, check the Charge Air Cooling Pump (V188) electrical harness connector terminal 1 for voltage.











Switch the ignition ON.

Specified value: Battery voltage.

- Switch the ignition off.

If the specified value was Not obtained:

- Check the wiring connection for an open circuit or short circuit to Engine ground

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

- If necessary, repair the faulty wiring connection and replace any open fuses

- Go to Final procedures

If the specified value was obtained:

Checking wiring

- Remove the Motronic Engine Control Module (ECM) (J623). Refer to appropriate service manual.

- Using a Multimeter, check the Charge Air Cooling Pump (V188) electrical connector terminal 2 to Motronic Engine Control Module (ECM) (J623) electrical connector T60 terminal 2 for an open circuit.

- Using a Multimeter, check the Charge Air Cooling Pump (V188) electrical connector terminal 3 to Motronic Engine Control Module (ECM) (J623) electrical connector T94 terminal 1, 2, or 4 for an open circuit.











Specified value: 1.5 ohms max.

If the specified values were Not obtained:

- Check the wiring connection for an open circuit, short circuit to Battery voltage or Ground

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

- If necessary, repair the faulty wiring connection.

- Go to Final procedures

If the specified value was obtained:

- Replace the Motronic Engine Control Module (ECM) (J623). Refer to appropriate service manual.

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 Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

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