WASTEGATE Bypass Regulator Valve, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• The Engine Control Module (ECM) - J623- fuses OK.
  Fig 1: Fuses On E-Box In Engine Compartment, Left Side

  Courtesy of VOLKSWAGEN UNITED STATES, INC.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window defroster, switched off.
• On vehicles with automatic transmission, selector lever in position "P" or "N".
• A/C switched off.
• Ground connections between engine/transmission/chassis OK.
• Ignition switched OFF.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK 

Start diagnosis 

-- Remove the engine cover with air filter. Refer to the Repair Information.

Checking internal resistance 

-- Disconnect the Wastegate Bypass Regulator Valve -N75- electrical harness connector -1-.

-- Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- terminals 1 to 2 for resistance.

Specified value: 20 to 30 Ω (at approx. 20°C)

If the specified value was Not obtained: 

-- Replace the Wastegate Bypass Regulator Valve -N75-. Refer to the Repair Information.

If the specified value was obtained: 

Checking Voltage supply 

Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal:	Measure to:
1	Engine Ground

-- Start the engine.

-- Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal 1 to engine ground.

Specified value: battery voltage.

-- Switch the ignition OFF.

If the specified value was Not obtained: 

-- Check the wiring for a short circuit to ground, high resistance or an open circuit.

-- Check fuse for open and replace if blown. Refer to the appropriate SYSTEM WIRING DIAGRAMS information.

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

-- If necessary, repair the wiring connection.

If the specified value was obtained: 

-- Remove the Engine Control Module (ECM) -J623- .

-- Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal to the Engine Control Module (ECM) -J623- electrical harness connector terminal for an open circuit.

Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal:	Engine Control Module (ECM) -J623- electrical connector T60 terminal:
2	3

Specified value: 1.5 Ω max.

If the specified value was Not obtained: 

-- Check the wiring for an open or high resistance.

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

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK: 

-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Information.

-- Install the engine cover with air filter. Refer to the Repair 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 .