Wastegate Bypass Regulator Valve -N75-, CHECKING

Function

Both the boost and intake pressures are used to control the wastegate of the turbocharger. These pressure signals are supplied to the Engine Control Module -J623-, which then sends a pulse-width modulated signal to the Wastegate Bypass Regulator Valve -N75-. As a result, the Wastegate Bypass Regulator Valve -N75- controls vacuum supply to the Pressure Unit, which directly acts on the wastegate via a connecting rod. This control system regulates the turbine speed and sets the maximum boost pressure.

Special tools and workshop equipment required 

• Multimeter
• Wiring Diagram
• Scan Tool

Test requirements

• Fuses OK.
• Battery voltage OK.
• Switch OFF All electrical and electronic accessories.
• Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
• Vehicles with Manual Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
• Coolant Temperature: ≥ 80° C.
• Observe all safety precautions: SAFETY PRECAUTIONS .
• View clean working conditions: CLEAN WORKING CONDITIONS .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	YES: GO TO Step 2. NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Wastegate Bypass Regulator Valve -N75- harness connector. CHECK: Wastegate Bypass Regulator Valve -N75- component connector terminals 1 to 2 for resistance. SPECIFIED VALUE: 13 - 17 Ω (@ approx. 20° C). -- Was Value obtained?	YES: GO TO: Step 3. NO: REPLACE: Wastegate Bypass Regulator Valve -N75-. Refer to appropriate repair Information. GO TO: Step 5.
3	IGNITION: ON. CHECK: Wastegate Bypass Regulator Valve -N75- harness connector terminal 1 to ground. SPECIFIED VALUE: Battery voltage. IGNITION: OFF. -- Was Value obtained?	YES: GO TO: Step 4. NO: CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. REPLACE: Any open fuses. GO TO: Step 5.
4	REMOVE: Engine Control Module - J623-. Refer to appropriate repair Information. CHECK: Wastegate Bypass Regulator Valve -N75- harness connector terminal 2 to the Engine Control Module - J623- harness connector terminal T60 / 3 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	YES: REPLACE: Engine Control Module -J623-. Refer to appropriate repair Information. GO TO: Step 5. NO: CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 5.
5	Final Procedure  Perform a road test to verify repair. Do any DTC's return:	YES: Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY . Perform the diagnostic procedure for that DTC. NO: Repair is complete. Generate readiness code. Refer to READINESS CODE . Return vehicle to Customer.