Radiator Fan Control Modules --, Checking

General Description

Using the signal from the Engine/Motor Control Module -J623-, the Coolant Fan Control Module -J293- / Radiator Fan Control Module 2 -J671- starts and stops the engine coolant fans when necessary to maintain the engine coolant at the correct operating temperature. The engine coolant in turn cools the engine in order to maintain the engine at the correct operating temperature.

NOTE:

This pinpoint provides a test sequence for both the J293 and the J671 as they use virtually identical terminals, with the exception of the two ECM control terminals. For simplicity, only the J293 component tag is used within the Test Procedure.

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. -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Coolant Fan Control Module -J293- harness connector. IGNITION: ON. CHECK: Coolant Fan Control Module -J293- harness connector terminals 1 and 2 to ground for voltage. CHECK: Coolant Fan Control Module -J293- harness connector terminal 4 to battery positive for voltage. SPECIFIED VALUE: Battery voltage. IGNITION: OFF. -- Were Values obtained?	-- YES: GO TO: Step 3. -- 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 4.
3	REMOVE: Engine/Motor Control Module - J623-. Refer to appropriate Service Information. CHECK: Coolant Fan Control Module -J293- harness connector terminal 3 to the Engine/Motor Control Module - J623- harness connector T56e / 28 (for the CXYA J293), T56e / 29 (for the CWWB J293), T56e / 25 (for the J671) for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Coolant Fan Control Module -J293- or Radiator Fan Control Module 2 -J671-. Refer to appropriate Service Information. GO TO: Step 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 4.
4	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Engine/Motor Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine/Motor Control Module -J623-. Refer to appropriate Service Information. Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY . Repair is complete. Generate Readiness Code. Refer to READINESS CODE . 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.