Inspection Procedure 9
INSPECTION PROCEDURE 9: Condenser Fan does not Operate.Condenser Fan Motor Part 1:
Condenser Fan Motor Part 2:
FUNCTION
The condenser turns the high-temperature and high-pressure refrigerant into liquid by cooling it down with fresh air, and it is cooled down by the air from the condenser fan.
PROBABLE CAUSES
- Malfunction of the condenser fan relay
- Malfunction of the condenser fan motor
- Malfunction of the ECM
- Malfunction of the harness.
- Malfunction of connector.
DIAGNOSIS
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
STEP 1. Check condenser fan motor connector A-29 and ECM
Q: Is condenser fan motor connector A-29 and ECM
YES: Go to Step 2.
NO: Repair or replace the connector. Refer to Harness Connector Inspection.
STEP 2. Measure the voltage at condenser fan motor connector A-29.
1. Disconnect condenser fan motor connector A-29, and measure the voltage at the wiring harness side.
2. Turn the ignition switch to the "ON" position.
3. Disconnect ECM
4. Measure the voltage between terminal 2 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Is the measured voltage approximately 12 volts?
YES: Go to Step 11.
NO: Go to Step 3.
STEP 3. Check condenser fan motor connector A-29 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is condenser fan motor connector A-29 in good condition?
YES: Go to Step 4.
NO: Repair or replace the connector. Refer to Harness Connector Inspection.
STEP 4. Check the condenser fan relay continuity.
Follow the table to check the condenser fan relay for continuity.
Q: Is the blower relay continuity in good condition?
YES: Go to Step 5.
NO: Replace the condenser fan relay.
STEP 5. Measure the voltage at condenser fan relay connector A-19X.
1. Disconnect condenser fan relay connector A-19X, and measure the voltage at the relay box side.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal 2 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Is the measured voltage approximately 12 volts?
YES: Go to Step 7.
NO: Go to Step 6.
STEP 6. Check the wiring harness between condenser fan relay connector A-19X (terminal 2) and the ignition switch (IG2).
NOTE: Also check junction block connector C-202, C-203 and joint connector (1) C-28 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-202, C-203 and joint connector (1) C-28 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between blower relay condenser fan relay connector A-19X (terminal 2) and the ignition switch (IG2) in good condition?
YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
NO: Repair the wiring harness.
STEP 7. Measure the voltage at condenser fan relay connector A-19X.
1. Disconnect condenser fan relay connector A-19X, and measure the voltage at the junction block side.
2. Measure the voltage between terminal 4 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Is the measured voltage approximately 12 volts?
YES: Go to Step 9.
NO: Go to Step 8.
STEP 8. Check the wiring harness between condenser fan relay connector A-19X (terminal 4) and the battery.
Q: Is the wiring harness between condenser fan relay connector A-19X (terminal 4) and the battery in good condition?
YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
NO: Repair the wiring harness.
STEP 9. Check the wiring harness between condenser fan relay connector A-19X (terminal 3) and condenser fan motor connector A-29 (terminal 2).
Q: Is the wiring harness between condenser fan relay connector A-19X (terminal 3) and condenser fan motor connector A-29 (terminal 2) in good condition?
YES: Go to Step 10.
NO: Repair the wiring harness.
STEP 10. Check the wiring harness between condenser fan relay connector A-19X (terminal 1) and ECM
Q: Is the wiring harness between condenser fan relay connector A-19X (terminal 1) and ECM
YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
NO: Repair the wiring harness.
STEP 11. Measure the resistance at condenser fan motor connector A-29 in order to the ground circuit to the blower motor.
1. Disconnect condenser fan motor connector A-29, and measure the resistance at the wiring harness side.
2. Measure the resistance value between terminal 1 and ground.
- The measured value should be 2 ohms or less.
Q: Does the measured resistance value correspond with this range?
YES: Go to Step 13.
NO: Go to Step 12.
STEP 12. Check the wiring harness between condenser fan motor connector A-29 (terminal 1) and ground.
Q: Is the wiring harness between condenser fan motor connector A-29 (terminal 1) and ground in good condition?
YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
NO: Repair the wiring harness.
STEP 13. Check the condenser fan motor operation.
Check to be sure that the condenser fan motor operates when battery voltage is applied to terminal 2 and terminal 1 grounded.
Q: Is there any abnormal noise?
YES: Replace the ECM
NO: Replace the condenser fan motor.