WASTEGATE Bypass Regulator Valve, 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.

See Appropriate Wiring Diagram Information for component locations and connector views.

Special Tools And Workshop Equipment Required 

• Multimeter.
• Wiring diagram.

Test Requirements 

• The Motronic Engine Control Module (ECM) - J623- fuses OK.
• 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.

Start Diagnosis 

-- Remove the engine cover with air filter.

Checking internal resistance

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

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

Specified Value: 12 To 18 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

-- 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 23 (2010 Model) or fuse 5 (2011 Model) in Fuse Panel B for open and replace if blown. Refer to Appropriate Wiring Diagrams for fuse locations.

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

-- If necessary, repair the wiring connection.

If The Specified Value Was Obtained: 

If the manufacturers test box is being used, perform the following step.

-- Install the test box.

If the manufacturers test box is not being used, perform the following step.

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

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

Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal	Motronic Engine Control Module (ECM) -J623- electrical connector T60 terminal or test box socket
2	20

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 Motronic Engine Control Module (ECM) -J623-.

-- Install the engine cover with air filter.

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 .