Cam Adjustment Actuators --, Checking: Notes

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-, 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 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 Cam Adjustment Actuators --, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Suspect Cam Adjustment Actuator(s) -- harness connector. CHECK: Suspect Cam Adjustment Actuator(s) -- component connector terminals 1 to 2 for resistance (refer to appropriate wiring diagram for correct terminal and connector locations). SPECIFIED VALUE: 5 - 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: Suspect Cam Adjustment Actuator(s) -- harness connector terminal 2 to ground for voltage (refer to appropriate wiring diagram for correct terminal and connector locations). 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: Suspect Cam Adjustment Actuator(s) -- harness connector terminal 1 to the Engine Control Module - J623- harness connector T94 / xx for resistance (refer to appropriate wiring diagram for correct terminal and connector locations). SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: TIP: The Cam Adjustment Actuator(s) -- may fail under loaded operation; please swap a known good Cam Adjustment Actuator(s) -- prior to continuing to the next step. 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	Refer To The Final Procedure Below;