Intake Manifold Tuning Valve - N156-, Checking: Notes

General Description

The intake manifold runner valve(s) are mounted on a common shaft and actuated by a vacuum cell. The partial vacuum required for actuation is supplied by the Intake Manifold Tuning Valve -N156-. The Engine Control Module -J623- activates the Intake Manifold Tuning Valve -N156- on the basis of a characteristic map.

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 automatic transmission, ensure the selector lever position is in "P".
Vehicles with manual transmission, ensure the shifter lever position is in "N" with the parking brake applied.
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 Intake Manifold Tuning Valve - N156-, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Intake Manifold Tuning Valve -N156- harness connector. CHECK: Intake Manifold Tuning Valve -N156- component connector terminals 1 to 2 for resistance. SPECIFIED VALUE: 5 - 35 Ω (@ approx. 20° C). -- Was Value obtained?	-- YES: GO TO: Step 3 Intake Manifold Tuning Valve - N156-, CHECKING - 3 . -- NO: REPLACE: Intake Manifold Tuning Valve -N156-. Refer to appropriate service information. GO TO: Step 5 Intake Manifold Tuning Valve - N156-, CHECKING - 5 .
3	IGNITION: ON. CHECK: Intake Manifold Tuning Valve -N156- harness connector terminal 1 to ground for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Was Value obtained?	-- YES: GO TO: Step 4 Intake Manifold Tuning Valve - N156-, CHECKING - 4 . -- NO: PERFORM: Visual Inspection of wiring and component. 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 Intake Manifold Tuning Valve - N156-, CHECKING - 5 .
4	REMOVE: Engine Control Module -J623-. Refer to appropriate service information. CHECK: Intake Manifold Tuning Valve -N156- harness connector terminal 2 to the Engine Control Module -J623- harness connector T60 / 52 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: TIP: The Intake Manifold Tuning Valve -N156- may fail under loaded operation; please swap a known good Intake Manifold Tuning Valve -N156- prior to continuing to the next step. GO TO: Step 5 Intake Manifold Tuning Valve - N156-, CHECKING - 5 . -- NO: PERFORM: Visual Inspection of wiring and component. 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 Intake Manifold Tuning Valve - N156-, CHECKING - 5 .
5	Refer To The Final Procedure Below;