Inspection Procedure 3

Inspection Procedure 1: Radiator Fan and Condenser Fan do not Operate [2.4L ENGINE]








CIRCUIT OPERATION
^ Based on the signal from the engine coolant temperature sensor and the signal from the secondary pulley speed sensor signal (vehicle speed signal) from the transaxle control module, and the A/C switch signal from the A/C-ECU, the engine control module sends the radiator fan and condenser fan control signal to the ETACS-ECU via CAN bus line.
^ Based on the radiator fan and condenser fan control signal from the engine control module, the ETACS-ECU turns ON/OFF the radiator fan relay, condenser fan relay, and the fan control relay to control the rotation of the radiator fan motor and condenser fan motor.

TECHNICAL DESCRIPTION
^ If the radiator fan and condenser fan do not operate, the radiator fan motor, the condenser fan motor, the radiator fan relay, the condenser fan relay, the fan control relay, the ETACS-ECU may be defective.
^ The CAN bus line, ETACS-ECU, CVT system, A/C system, or MFI system may also be defective.

TROUBLESHOOTING HINTS
^ Malfunction of CAN bus system.
^ Damaged harness or connector.
^ Malfunction of the MFI system.
^ Malfunction of the CVT system.
^ Malfunction of the A/C system.
^ Malfunction of fusible link No. 28.
^ Malfunction of fusible link No. 29.
^ Malfunction of radiator fan relay.
^ Malfunction of condenser fan relay.
^ Malfunction of fan control relay.
^ Malfunction of radiator fan motor.
^ Malfunction of condenser fan motor.
^ Malfunction of engine compartment relay box.
^ Malfunction of ETACS-ECU.
^ Malfunction of engine control module.

DIAGNOSIS PROCEDURE

CAUTION:
^ If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
^ Before replacing the ECU, ensure that the CAN bus lines is normal.

Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: V.C.I.
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A
^ MB991223: Harness Set
^ MB992006: Extra Fine Probe

STEP 1. Check the CAN bus system diagnosis.
Using M.U.T.-III, perform CAN bus diagnosis.

Q: Is the check result satisfactory?
YES: Go to Step 2.
NO: Repair the CAN bus lines. Then go to Step 22.

STEP 2. Check the MFI system diagnosis code.
Using M.U.T.-III, perform MFI system diagnosis code.

Q: Is any diagnosis code set?
YES: Repair the MFI system. Then go to Step 22.
NO: Go to Step 4. [M/T]
NO: Go to Step 3.

STEP 3. Check the CVT system diagnosis code.
Using M.U.T.-III, perform CVT system diagnosis code.

Q: Is any diagnosis code set?
YES: Repair the CVT system. Then go to Step 22.
NO: Go to Step 4.

STEP 4. Check the A/C system diagnosis code.
Using M.U.T.-III, perform A/C system diagnosis code.

Q: Is any diagnosis code set?
YES: Repair the A/C system. Then go to Step 22.
NO: Go to Step 5.

STEP 5. Check the ETACS system diagnosis code.
Using M.U.T.-III, perform ETACS system diagnosis code.

Q: Is any diagnosis code set?
YES: Repair the ETACS system. Then go to Step 22.
NO: Go to Step 6.

STEP 6. Check the ETACS system data list.
Using M.U.T.-III, check the ETACS system data list.
^ Item 233: Fan Lo
^ Item 234: Fan Hi

Q: Is the check result normal?
YES: Go to Step 21.
NO: Go to Step 7.

STEP 7. Measure the voltage at ETACS-ECU connector C-312.
1) Disconnect the ETACS-ECU connector C-312 and measure at the harness connector side.
2) Turn the ignition switch to the "ON" position.
3) Measure the voltage between terminal No. 2 and earth, between terminal No. 8 and earth, and between terminal No. 9 and earth.
OK: Battery positive voltage.
4) Turn the ignition switch to the "LOCK" (OFF) position.
5) Connect the ETACS-ECU connector C-312.

Q: Is the check result normal?
YES: Go to Step 13.
NO: Go to Step 8.

STEP 8. Connectors check: A-26X condenser fan relay connector, A-29X radiator fan relay, A-31X fan control relay and C-312 ETACS-ECU connector.

Q: Is the check result normal?
YES: Go to Step 9.
NO: Repair or replace the damaged connectors or replace the relay box. Then go to Step 22.

STEP 9. Check the harness between condenser fan relay connector A-26X terminal No. 2 and ETACS-ECU connector C-312 terminal No. 8, between radiator fan relay connector A-29X terminal No. 1 and ETACS-ECU connector C-312 terminal No. 2, and between fan control relay connector A-31X terminal No. 3 and ETACS-ECU connector C-312 terminal No. 9.

Q: Is the check result normal?
YES: Go to Step 10.
NO: Repair the damaged harness wire or replace the relay box. Then go to Step 22.

STEP 10. Check the harness between fusible link No.28 and condenser fan relay connector A-26X terminal No. 1, between fusible link No.28 and fan control relay connector A-31X terminal No. 1, and between fusible link No.29 and radiator fan relay connector A-29X terminal No. 3.

Q: Is the check result normal?
YES: Go to Step 11.
NO: Repair the damaged harness wire or replace the relay box. Then go to Step 22.

STEP 11. Check the radiator fan relay, the condenser fan relay and the fan control relay.

Q: Is the check result normal?
YES: Go to Step 12.
NO: Replace the relay Then go to Step 22.

STEP 12. Check the fusible link No. 28 and No. 29.

Q: Is the check result normal?
YES: It can be assumed that this malfunction is intermittent.
NO: replace the fusible link. Then go to Step 22.

STEP 13. Connectors check: A-26X condenser fan relay connector, A-29X radiator fan relay, A-31 X fan control relay, A-05 radiator fan motor connector and A-43 condenser fan motor connector.

Q: Is the check result normal?
YES: Go to Step 14.
NO: Repair or replace the damaged connectors or replace the relay box. Then go to Step 22.

STEP 14. Check the harness between condenser fan relay connector A-26X terminal No. 3 and condenser fan motor connector A-43 terminal No. 1, and between condenser fan motor connector A-43 terminal No. 2 and earth.

Q: Is the check result normal?
YES: Go to Step 15.
NO: Repair the damaged harness wire. Then go to Step 22.

STEP 15. Check the between radiator fan relay connector A-29X terminal No. 2 and radiator fan motor connector A-05 terminal No. 1, and between radiator fan motor connector A-05 terminal No. 2 and fan control relay A-31X terminal No. 5.

Q: Is the check result normal?
YES: Go to Step 16.
NO: Repair the damaged harness wire. Then go to Step 22.

STEP 16. Check the harness between fan control relay connector A-31X terminal No. 2 and condenser fan relay connector A-26X terminal No. 3, and between fan control relay connector A-31X terminal No. 4 and earth.

Q: Is the check result normal?
YES: Go to Step 17.
NO: Repair the damaged harness wire. Then go to Step 22.

STEP 17. Check the harness between fusible link No.28 and condenser fan relay connector A-26X terminal No. 4, between fusible link No.29 and radiator fan relay connector A-29X terminal No. 4.

Q: Is the check result normal?
YES: Go to Step 18.
NO: Repair the damaged harness wire or replace the relay box. Then go to Step 22.

STEP 18. Check the radiator fan relay, the condenser fan relay and the fan control relay.

Q: Is the check result normal?
YES: Go to Step 19.
NO: Replace the relay. Then go to Step 22.

STEP 19. Check the radiator fan motor and the condenser fan motor.

Q: Is the check result normal?
YES: Go to Step 20.
NO: Replace the radiator fan motor or condenser fan motor. Then go to Step 22.

STEP 20. Check the ETACS system data list.
Using M.U.T.-III, check the ETACS system data list.
^ Item 233: Fan Lo
^ Item 234: Fan Hi

Q: Is the check result normal?
YES: Go to Step 21.
NO: Replace the ETACS-ECU. Then go to Step 22.

STEP 21. Check the MFI system actuator test.
Using M.U.T.-III, check the MFI system actuator test.
^ Item 14: Cooling fan motor.

Q: Is the check result normal?
YES: It can be assumed that this malfunction is intermittent.
NO: Replace the Engine Control Module. Then go to Step 22.

STEP 22. Check the symptoms.

Q: Does the radiator fan operate?
YES: The procedure is complete.
NO: Return to Step 1.