Part 2

STEP 18. Check the wiring harness for open circuit.




1. Disconnect A/C-ECU connector C-15 and air mixing damper control motor and potentiometer connector C-109, and measure the resistance at the wiring harness side.




2. Measure the resistance between A/C-ECU connector C-15 terminal 2 and air mixing damper control motor and potentiometer connector C-109 terminal 2.

OK: Less than 2 ohms

Q: Is the check result normal?

YES: Go to Step 20.

NO: Go to Step 19.




STEP 19. Check the wiring harness between A/C-ECU connector C-15 (terminal 2) and air mixing damper control motor and potentiometer connector C-109 (terminal 2).

Q: Is the wiring harness between A/C-ECU connector C-15 (terminal 2) and air mixing damper control motor and potentiometer connector C-109 (terminal 2) 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 20. Measure the resistance at A/C-ECU connector C-15.




1. Disconnect A/C-ECU connector C-15, and measure the resistance at the wiring harness side.




2. Measure the resistance value between terminal 1 and ground.

OK: 1 kohm or more

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 22.

NO: Go to Step 21.




STEP 21. Check the wiring harness between A/C-ECU connector C-15 (terminal 1) and air mixing damper control motor and potentiometer connector C-109 (terminal 1).

Q: Is the wiring harness between A/C-ECU connector C-15 (terminal 1) and air mixing damper control motor and potentiometer connector C-109 (terminal 1) 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 22. Measure the resistance at A/C-ECU connector C-15.




1. Disconnect A/C-ECU connector C-15, and measure the resistance at the wiring harness side.




2. Measure the resistance value between terminal 2 and ground.

OK: 1 kohm or more

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 24.

NO: Go to Step 23.




STEP 23. Check the wiring harness between A/C-ECU connector C-15 (terminal 2) and air mixing damper control motor and potentiometer connector C-109 (terminal 2).

Q: Is the wiring harness between A/C-ECU connector C-15 (terminal 2) and air mixing damper control motor and potentiometer connector C-109 (terminal 2) 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 24. Check junction block connector C-215 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is junction block connectors C-215 in good condition?

YES: Go to Step 25.

NO: Repair or replace the connector. Refer to Harness Connector Inspection.

STEP 25. Check the wiring harness for open circuit.







1. Disconnect A/C-ECU connector C-20 and junction block connector C-215, and measure the resistance at the wiring harness side.




2. Measure the resistance between A/C-ECU connector C-20 terminal 28 and junction block connector C-215 terminal 16.

OK: Less than 2 ohms

Q: Is the check result normal?

YES: Go to Step 27.

NO: Go to Step 26.







STEP 26. Check the wiring harness between A/C-ECU connector C-20 (terminal 28) and junction block connector C-215 (terminal 16).






NOTE: Also check joint connector C-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-01 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 28) and junction block connector C-215 (terminal 16) 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 27. Recheck for diagnostic trouble code.

Recheck if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to "OFF" position.
3. Turn the ignition switch to "ON" position.
4. Drive the vehicle and check if the diagnostic trouble code is set.

Q: Is the check result satisfactory?

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: Replace the A/C-ECU.