Charge Air Cooling Pump, Checking

Observe all safety precautions: SAFETY PRECAUTIONS .

View 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 appropriate System Wiring Diagram.

Special tools and workshop equipment 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 .

Start diagnosis 

-- 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:

Charge Air Cooling Pump -V188- electrical harness connector terminals:	Specified values
1 to 2	640 to 720 Ω
3 to ground	15 to 17 Ω

If any of the specified values were Not obtained:

-- Replace the Charge Air Cooling Pump -V188-. Refer to appropriate Service Information.

-- Go to Final procedures.

If the specified values were obtained:

Checking voltage supply 

-- 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.

Charge Air Cooling Pump -V188- electrical harness connector terminal:	Measure to
1	Engine Ground (GND)

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 Engine Control Module - J623 -. Refer to appropriate Service Information.

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

Charge Air Cooling Pump -V188- electrical harness connector terminals:	Engine Control Module - J623 - electrical connector T60 / T94 terminals:
2	T60 / 2
3	T94 / 1, 2, 4

Specified value: 1.5 Ω 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 Engine Control Module - J623 -. Refer to appropriate Service Information.

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 .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .