Cam Adjustment Actuators --, Checking

Includes:
Cylinder 1 Exhaust Camshaft Adjuster A -N580-
Cylinder 1 Exhaust Camshaft B -N581-
Cylinder 2 Exhaust Camshaft Adjuster A -N588-
Cylinder 2 Exhaust Camshaft B -N589-
Cylinder 3 Exhaust Camshaft Adjuster A -N596-
Cylinder 3 Exhaust Camshaft B -N597-
Cylinder 4 Exhaust Camshaft Adjuster A -N604-
Cylinder 4 Exhaust Camshaft B -N605-

General Description

The Cam Adjustment Actuators -- are electromagnetic solenoid-type actuators. Two actuators are used per cylinder. One actuator moves the cam element on the camshaft for large valve lift. The other actuator resets the cam element for small valve lift. Each actuator is attached externally to the cylinder head cover by a bolt. They are sealed with O rings. When the actuator is activated by the Engine Control Module -J623-, a metal pin engages the displacement groove in the cam element, thereby moving the other cam lobe into position.

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.
Observe all safety precautions: .
View clean working conditions: .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to . -- Was Complaint verified?	-- YES: GO TO: Step 2 Cam Adjustment Actuators --, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Suspected Cam Adjustment Actuator(s) -- harness connector. CHECK: Suspected Cam Adjustment Actuator(s) -- component connector terminals 1 to 2 for resistance. Refer to appropriate wiring diagram. SPECIFIED VALUE: 7 - 10 Ω (@ approx. 20° C). -- Was Value obtained?	-- YES: GO TO: Step 3 Cam Adjustment Actuators --, CHECKING - 3 . -- NO: REPLACE: Cam Adjustment Actuator(s) --. Refer to appropriate service information. GO TO: Step 5 Cam Adjustment Actuators --, CHECKING - 5 .
3	IGNITION: ON. CHECK: Suspected Cam Adjustment Actuator(s) -- harness connector terminal 2 to ground for voltage. Refer to appropriate wiring diagram. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Was Value obtained?	-- YES: GO TO: Step 4 Cam Adjustment Actuators --, 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 Cam Adjustment Actuators --, CHECKING - 5 .
4	REMOVE: Engine Control Module - J623-. Refer to appropriate service information. CHECK: Suspected Cam Adjustment Actuator(s) -- harness connector terminal 1 to the Engine Control Module - J623- harness connector for resistance. Refer to appropriate wiring diagram. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Cam Adjustment Actuator(s) --. Refer to appropriate service information. GO TO: Step 5 Cam Adjustment Actuators --, 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 Cam Adjustment Actuators --, CHECKING - 5 .
5	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine Control Module -J623-. Refer to appropriate service information. Clear the DTC's. Refer to . Repair is complete. Generate Readiness Code. Refer to . Return vehicle to Customer. -- NO: Perform the diagnostic procedure for any DTC's. If no DTC's return the repair is complete. Return vehicle to customer.