Wastegate Bypass Regulator Valve N75 , checking

Special tools, testers and auxiliary items required 

• Multimeter.
• Wiring diagram.

Test requirements 

Fig 1: Identifying Main Fuse Panel

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• The Motronic Engine Control Module (ECM) J220 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 (GND) connections between engine/transmission/chassis OK.
• Ignition switched off.

Procedure 

Fig 2: Removing Engine Cover

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• Remove the engine cover with air filter → 24 MULTIPORT FUEL INJECTION (MFI) .

Checking internal resistance 

Fig 3: Disconnecting Electrical Harness Connector

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

Fig 4: Checking Wastegate Bypass Regulator Valve N75 Terminals 1 To 2 For Resistance

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• 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 specification was not obtained:

• Replace the Wastegate Bypass Regulator Valve N75 → 21 - TURBOCHARGER, G-CHARGER .

If the specification is obtained:

Checking Voltage supply 

Fig 5: Identifying 2-Pin Electrical Harness Connector & Terminals

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• Using a multimeter , check the Wastegate Bypass Regulator Valve N75 electrical harness connector terminal 1 to Ground (GND).

• Operate the starter briefly.

Specified value: battery voltage.

• Switch the ignition off.

If the specification was not obtained:

• Check the wiring for a short circuit to Battery positive (+) or an open circuit.
• Check the electrical harness connector for damage, corrosion, lose or broken terminals.
• If necessary, repair the wiring connection.

If no malfunction is found in the wiring:

If the manufacturers test box is being used. Perform the following step.

• Install the test box. Refer to → 24 MULTIPORT FUEL INJECTION (MFI) .

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

• Remove the Motronic Engine Control Module (ECM) J220. Refer to chapter → Motronic Engine Control Module (ECM) J220 , replacing 

Fig 6: Identifying 2-Pin Electrical Harness Connector & Terminals

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• Using a multimeter , check the Wastegate Bypass Regulator Valve N75 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) J220 electrical harness connector 104 for an open circuit.

Specified value: 1.5 Ω max.

If the specification is not obtained:

• Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
• Check the electrical harness connector for damage, corrosion, lose 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) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing  .
• Install the engine cover with air filter → 24 MULTIPORT FUEL INJECTION (MFI) .

Final procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to Diagnostic Mode 04: Reset/delete diagnostic data .
3. If the DTC memory was erased, generate readiness code. Refer to Readiness Code .

• End of diagnosis.