EGR Cooler Pump Checking

Observe all safety precautions: SAFETY PRECAUTIONS 

View clean working conditions: CLEAN WORKING CONDITIONS 

Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .

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 and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• The ignition switched off.

Start diagnosis 

-- Disconnect the EGR Cooler Pump -V400- electrical harness connector.

Checking resistance 

-- Measure the resistance of the EGR Cooler Pump -V400- connector by connecting the RED multimeter lead to terminal 2 and the BLACK lead to terminal 3.

Specified value: 1.53 M Ohms (+/-.8 M Ohm)

-- Measure the resistance of the EGR Cooler Pump -V400- connector by connecting the RED multimeter lead to terminal 1 and the BLACK lead remains on terminal 3.

Specified value: 1.54 M Ohms (+/-.8 M Ohm)

If the any specified value was Not obtained, replace the EGR Cooler Pump -V400-.

If the specified value was obtained:

Checking voltage 

-- Turn the ignition switch ON.

-- Measure the voltage of the EGR Cooler Pump -V400- harness connector terminal 2 to ground.

Specified value: near Battery voltage

-- Measure the voltage of the EGR Cooler Pump -V400- harness connector terminal 3 to ground.

Specified value: near 0 V

-- Measure the resistance of the EGR Cooler Pump -V400- harness connector terminal 1 to ground.

Specified value: 1.5 ohm max.

If any the specified values were Not obtained:

Checking wiring 

-- Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

-- Using a multimeter, check the EGR Cooler Pump -V400- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness T94 connector for resistance.

EGR Cooler Pump -V400- electrical harness connector (female terminals)	Engine Control Module (ECM) -J623- electrical harness connector terminals or fuse location
1	Body Ground
2	fuse S-10
3	T94/83

Specified value: 1.5 Ω Max.

If the specification was not obtained:

-- Check the wiring for a short circuit to each other, Battery positive, Ground or high resistance.

-- If necessary, repair the faulty wiring connection.

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

If no malfunction is detected in the wiring and the voltage readings were Not correct:

-- Replace the Engine Control Module (ECM) -J623-. Refer to the service information for removal and installation procedures.

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 .