Exhaust Gas RECIRCULATION Cooler Switch-Over Valve, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuses of Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J 248 must be OK.
  Fig 1: Identifying Fuses On E-Box In Engine Compartment, Left Side

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• The ignition switched off.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS .

Start diagnosis 

-- Disconnect the Exhaust Gas Recirculation (EGR) Cooler Switch-Over Valve -N345- electrical harness connector.

Checking internal resistance 

-- Using a Multimeter --, check the Exhaust Gas Recirculation (EGR) Cooler Switch-Over Valve -N345- terminals 1 and 2 for resistance.

Specified value: 14 to 40 Ω.

If the specified value is not obtained:

-- Replace the Exhaust Gas Recirculation (EGR) Cooler Switch-Over Valve -N345-.

If the specification is obtained:

Checking voltage 

-- Switch the ignition on.

-- Using a Multimeter, check the Exhaust Gas Recirculation (EGR) Cooler Switch-Over Valve -N345- electrical harness connector terminal 1 to Ground (GND) for voltage.

Specified value: Battery (+).

If the specified value was not obtained:

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

-- If necessary, repair the faulty wiring connection.

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 Exhaust Gas Recirculation (EGR) Cooler Switch-Over Valve -N345- electrical harness connector terminal to the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical harness connector T60 terminal for resistance.

Exhaust Gas Recirculation (EGR) Cooler Switch-Over Valve -N345- electrical harness connector terminal	Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical harness connector T60 terminals or test box socket
2	15

Specified value: 1.5 Ω Max.

If the specification was not obtained:

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

-- 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:

-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to READINESS CODE .

-- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the 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 .

-- Assembly is performed in the reverse of the removal.

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 .