Engine Temperature Control Actuator -N493-, Checking

General Description

Coolant flow is regulated by means of two mechanically coupled rotary slide valve s. The angular position of the rotary slide valve s is regulated according to various engine maps stored in the engine control unit. Various switching positions can be implemented by configuring the rotary slide valve s accordingly. This allows rapid heating of the engine, which, in turn, results in lower friction and higher fuel economy.

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 Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
Observe all safety precautions: .
View clean working conditions: .

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers concern. Refer to . -- Was Complaint verified?	-- YES: GO TO: Step 2 Engine Temperature Control Actuator -N493-, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Engine Temperature Control Actuator -N493- harness connector. CHECK: Engine Temperature Control Actuator -N493- component connector terminals 4 to 5 for resistance. SPECIFIED VALUE: 2.4 - 4.6 Ω (@ approx. 20° C). -- Was Value obtained?	-- YES: GO TO: Step 3 Engine Temperature Control Actuator -N493-, CHECKING - 3 . -- NO: REPLACE: Engine Temperature Control Actuator -N493-. Refer to appropriate service information. GO TO: Step 6 Engine Temperature Control Actuator -N493-, CHECKING - 6 .
3	IGNITION: ON. CHECK: Engine Temperature Control Actuator -N493- harness connector terminals 1 to 3 for voltage. SPECIFIED VALUE: About 5.0 V. IGNITION: OFF. -- Was Value obtained?	-- YES: GO TO: Step 5 Engine Temperature Control Actuator -N493-, CHECKING - 5 . -- NO: GO TO: Step 4 Engine Temperature Control Actuator -N493-, CHECKING - 4 .
4	REMOVE: Engine Control Module - J623-. Refer to appropriate service information. CHECK: Engine Temperature Control Actuator -N493- harness connector terminal 1 to the Engine Control Module - J623- harness connector T105 / 33 for resistance. CHECK: Engine Temperature Control Actuator -N493- harness connector terminal 3 to the Engine Control Module - J623- harness connector T105 / 35 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: GO TO: Step 6 Engine Temperature Control Actuator -N493-, CHECKING - 6 . -- 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 6 Engine Temperature Control Actuator -N493-, CHECKING - 6 .
5	REMOVE: Engine Control Module - J623-. Refer to appropriate service information. CHECK: Engine Temperature Control Actuator -N493- harness connector terminal 2 to the Engine Control Module - J623- harness connector T105 / 80 for resistance. CHECK: Engine Temperature Control Actuator -N493- harness connector terminal 4 to the Engine Control Module - J623- harness connector T105 / 86 for resistance. CHECK: Engine Temperature Control Actuator -N493- harness connector terminal 5 to the Engine Control Module - J623- harness connector T105 / 87 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Engine Temperature Control Actuator -N493-. Refer to appropriate service information. GO TO: Step 6 Engine Temperature Control Actuator -N493-, CHECKING - 6 . -- 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 6 Engine Temperature Control Actuator -N493-, CHECKING - 6 .
6	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.