Inspection Procedure 19: Condenser Fan Relay System

OPERATION

The battery voltage is applied to the A/C condenser fan relay coil from the IG2 relay.
The engine-ECU connector terminal F/LO turns on the switch of the power transistor on the unit, and then turns on the switch of the relay by applying the electrical current to the A/C condenser fan relay coil.
When the A/C condenser fan relay is in ON position, the battery voltage is applied to the A/C condenser fan motor from the A/C condenser fan relay.

FUNCTION

When the A/C condenser fan relay is in ON position, the fan motor rotates.

PROBABLE CAUSES

Failed A/C condenser fan relay
Failed A/C condenser fan motor
Open/short circuit in or damage to the A/C condenser fan relay circuit or loose connector contact
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check A/C condenser fan relay.

Check A/C condenser fan relay (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Relay Check ).

Q. Is the check result normal?

	Go to Step 2.

	Replace A/C condenser fan relay.

STEP 2. Check A/C condenser fan motor itself.

Check A/C condenser fan motor (Refer to GROUP 55B - Condenser Assembly, Condenser Fan Check ).

Q. Is the check result normal?

	Go to Step 3.

	Replace condenser fan motor.

STEP 3. Perform voltage measurement at A/C condenser fan relay connector.

Disconnect connector and measure at harness side.
Voltage between terminal battery line and earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 4.

	Repair or replace the connector(s), or check and repair the harness of short circuit to earth, and open circuit in power supply line between battery and A/C condenser fan relay connector.

STEP 4. Perform voltage measurement at A/C condenser fan relay connector.

Disconnect connector and measure at harness side.
Ignition switch: "ON"
Voltage between terminal IG2 line and earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 5.

	Repair or replace the connector(s), or check and repair the harness of short circuit to earth, and open circuit in IG2 line between IG2 relay and A/C condenser fan relay connector.

STEP 5. Check of damage in power supply line between battery and A/C condenser fan relay connector.

Q. Is the check result normal?

	Go to Step 6.

	Repair the connector(s) or wiring harness.

STEP 6. Check of damage in IG2 line between ignition switch connector and A/C condenser fan relay connector.

Q. Is the check result normal?

	Go to Step 7.

	Repair the connector(s) or wiring harness.

STEP 7. Check of damage in IG2 line between IG2 relay connector and A/C condenser fan relay connector.

Q. Is the check result normal?

	Go to Step 8.

	Repair the connector(s) or wiring harness.

STEP 8. Perform voltage measurement at engine-ECU connector.

Disconnect connector and measure at harness side.
Ignition switch: "ON"
Voltage between terminal F/LO line and earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 9.

	Repair or replace the connector(s), or check and repair the harness of short circuit to earth, and open circuit in F/LO line between A/C condenser fan relay connector and engine-ECU connector.

STEP 9. Check of damage in F/LO line between A/C condenser fan relay connector and engine-ECU connector.

Q. Is the check result normal?

	Go to Step 10.

	Repair the connector(s) or wiring harness.

STEP 10. Perform resistance measurement at A/C condenser fan motor connector.

Disconnect connector and measure at harness side.
Resistance between terminal earth line and earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 11.

	Check and repair harness between A/C condenser fan motor connector and body earth. Repair or replace the connector, or check and repair the harness of damage in earth line between A/C condenser fan motor connector and body earth.

STEP 11. Check of open circuit, short circuit, and damage in power supply line between A/C condenser fan relay connector and A/C condenser fan motor connector.

Q. Is the check result normal?

	Go to Step 12.

	Repair the connector(s) or wiring harness.

STEP 12. M.U.T.-III actuator test

Refer to Data List Reference Table .

Item 29: Condenser fan relay

Q. Are the check results normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Replace engine-ECU.