TROUBLESHOOTING INDEX
| No. | TROUBLESHOOTING ITEM | DESCRIPTION |
|---|---|---|
| 1 | Insufficient air (or no air) blown from front vents | Problem with each vent and/or duct Front airflow mode does not change when switching front mode switch. |
| 2 | Amount of air blown from front vents does not change | Malfunction in front blower system Amount of air blown front vents does not change when switching front climate control unit t airflow control dial. |
| 3 | Air intake mode from front vent does not change | Malfunction in A/C unit and/or front climate control unit air intake mode switching system Air intake mode does not change when switching REC/FRESH mode. |
| 4 | No temperature control with front climate control unit | Malfunction in A/C unit and/or front climate control unit air mix system Temperature does not change when switching front climate control unit temperature setting dial. |
| 5 | Windshield fogged | Malfunction in A/C compressor control system and/or air intake mode switching system A/C compressor does not operate while airflow mode is DEFROSTER or HEAT/DEF modes. Air intake mode does not change to FRESH while airflow mode is in DEFROSTER or HEAT/DEF modes. |
| 6 | Insufficient air (or no air) from rear vent | Problem with each rear vent and/or duct Rear airflow mode does not change when front and/or rear climate control unit mode switches. |
| 7 | Amount of air from rear vent does not change | Malfunction in rear blower motor system Amount of air blowing rear vents does not change when switching front and/or rear climate control unit airflow volume control dial. |
| 8 | Air from front/rear vents not cold enough | Malfunction in A/C basic system Magnetic clutch operates but A/C system malfunctions. |
| 9 | No cool air from front/rear vents | Malfunction in A/C compressor control system Magnetic clutch does not operate when the A/C system is turned ON. |
| 10 | Noise while operating A/C system | Problem with A/C basic system installation Noise from magnetic clutch, A/C compressor, hose or refrigerant line. |
| 11 | Dual A/C control function does not operate | Malfunction in A/C unit and/or front climate control unit dual A/C control system Driver or passenger-side temperature control dial does not operate individually. |
TROUBLESHOOTING CHART
Diagnostic Procedure
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT FRONT AIRFLOW MODE ACTUATOR Is it okay? | Yes | Go to the next step. |
| No | Repair or replace malfunctioning part in accordance with inspection result. | ||
| 2 | INSPECT TO SEE WHETHER MALFUNCTION IS IN FRONT VENT MODE OR OTHER MODES Does air blow out when in the front VENT mode? | Yes | Go to Step 5. |
| No | Go to the next step. | ||
| 3 | INSPECT FRONT VENT Is the front vent clogged? | Yes | Remove obstruction, then go to Step 9. |
| No | Go to the next step. | ||
| 4 | VERIFY THAT DUCT IN DASHBOARD IS INSTALLED Is the duct in the dashboard properly installed? | Yes | Inspect the duct for clogging, deformation and air leakage, then go to Step 9. |
| No | Install the duct securely in the proper position, then go to Step 9. | ||
| 5 | INSPECT TO SEE WHETHER MALFUNCTION IS IN FRONT HEAT MODE OR FRONT DEFROSTER MODE Does air blow out when in the front HEAT mode? | Yes | Go to the next step. |
| No | Inspect the vent for clogging, then go to Step 9. | ||
| 6 | INSPECT FRONT DEFROSTER MODE Does air blow out when in the front DEFROSTER mode? | Yes | Operation is normal. Recheck malfunction symptoms. |
| No | Go to the next step. | ||
| 7 | INSPECT FRONT VENT Is the vent clogged? | Yes | Remove obstruction, then go to Step 9. |
| No | Go to the next step. | ||
| 8 | VERIFY THAT DEFROSTER DUCT IS INSTALLED Is the defroster duct properly installed? | Yes | Inspect the duct for clogging, deformation, and air leakage, then go to the next step. |
| No | Install the duct securely in proper position, then go to the next step. | ||
| 9 | VERIFY REPAIR Does air blow out? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT HEATER 50 A FUSE Inspect the HEATER 50 A fuse. Is it normal? | Yes | Go to the next step. |
| No | Replace the fuse, then go to Step 15. If the fuse burns out immediately, go to the next step. | ||
| 2 | INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C UNIT OR ELSEWHERE Turn the ignition switch to the ON position. Turn the fan switch to ON position. Recirculate air inside the vehicle. Does the front blower motor operate normal speed? | Yes | Go to the next step. |
| No | Go to Step 4. | ||
| 3 | INSPECT FRONT A/C UNIT INTAKE VENT Is front A/C unit intake vent clogged? | Yes | Remove obstruction, then go to Step 15. |
| No | Inspect if there are any obstruction in the A/C unit passage, then go to Step 15. | ||
| 4* | INSPECT TO SEE WHETHER MALFUNCTION IS IN FRONT BLOWER RELAY SYSTEM OR FRONT POWER MOS FET SYSTEM Turn the ignition switch to ON position. Turn the fan switch to OFF position. Measure the voltage at the following front blower motor terminal. Terminal B (blower motor operation signal) Is voltage approx. 12 V? | Yes | Go to Step 8. |
| No | Go to the next step. | ||
| 5* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FUSE BLOCK AND FRONT BLOWER RELAY) OR ELSEWHERE Measure the voltage at the following front blower relay terminals. Terminal B (IG2 signal) Terminal A (B+ signal) Is the voltage approx. 12 V? | Yes | Go to the next step. |
| No | Repair the wiring harness between the front blower relay and A/C 7.5A fuse/HEATER 50 A fuse, then go to Step 15. | ||
| 6* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FRONT BLOWER RELAY AND GROUND) OR ELSEWHERE Measure the voltage at the following front blower relay terminal. Terminal D (GND signal) Is the voltage approx. 0 V? | Yes | Go to the next step. |
| No | Repair the wiring harness between the front blower relay and ground, then go to Step 15. | ||
| 7* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT BLOWER RELAY AND FRONT BLOWER MOTOR) OR BLOWER RELAY Measure the voltage at the following front blower relay terminal. Terminal C (blower motor operation signal) Is the voltage approx. 12 V? | Yes | Repair the wiring harness between the front blower relay and blower motor, then go to Step 15. |
| No | Replace the front blower relay, then go to Step 15. | ||
| 8* | INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER MOTOR OR ELSEWHERE Measure the voltage at the following blower motor terminal. Terminal B (blower motor operation signal) Is the voltage approx. 12 V? | Yes | Go to the next step. |
| No | Inspect the front blower motor, then go to Step 15. | ||
| 9* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT BLOWER MOTOR AND FRONT POWER MOS FET) OR ELSEWHERE Measure the voltage at the following terminal of front power MOS FET. Terminal A (blower motor operation signal) Is voltage approx. 12 V? | Yes | Go to the next step. |
| No | Repair the wiring harness between the front blower motor and front power MOS FET, then go to Step 15. | ||
| 10* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT POWER MOS FET AND GROUND) OR ELSEWHERE Measure the voltage at the following front power MOS FET terminal. Terminal E (blower motor operation signal) Is the voltage approx. 0 V? | Yes | Go to the next step. |
| No | Repair the wiring harness between the front power MOS FET and ground, then go to Step 15. | ||
| 11 | INSPECT FRONT A/C UNIT Inspect the fan for following: Is the fan free of interference with the A/C unit case? Is the fan free of foreign material and obstruction? Is the fan normal? | Yes | Go to the next step. |
| No | Remove obstruction, repair or replace the fan and front A/C unit case, then go to Step 15. | ||
| 12* | INSPECT TO SEE WHETHER MALFUNCTION IS IN FRONT POWER MOS FET OR ELSEWHERE Disconnect front power MOS FET connector. Turn the fun switch to 1st position from off. Measure the voltage at the following front power MOS FET terminal. Terminal B (blower motor control signal) Is voltage approx. 10 V? | Yes | Replace the front power MOS FET, then go to Step 15. |
| No | Go to the next step. | ||
| 13* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FRONT POWER MOS FET AND FRONT CLIMATE CONTROL UNIT) OR ELSEWHERE Turn the ignition switch to the LOCK position. Disconnect front climate control unit connector. Inspect for continuity at the following terminals between the front power MOS FET and front climate control unit. Terminal F-1P (blower motor control signal) Terminal B-1N (blower motor feedback signal) Is there continuity? | Yes | Go to the next step. |
| No | Repair the wiring harness between the front power MOS FET and climate control unit, then go to Step 15. | ||
| 14* | INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR WIRING HARNESS (SHORT TO GROUND IN WIRING HARNESS BETWEEN FRONT POWER MOS FET AND FRONT CLIMATE CONTROL UNIT) Inspect for continuity at the following terminal between the power MOS FET and ground. Terminal D (blower motor control signal)-ground Is there continuity? | Yes | Repair the wiring harness between the front power MOS FET and ground, then go to the next step. |
| No | Replace the front climate control unit, then go to the next step. | ||
| 15 | VERIFY REPAIR Is air discharged from vent? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT AIR INTAKE ACTUATOR Is the air intake actuator normal? | Yes | Go to the next step. |
| No | Replace the air intake actuator, then go to Step 9. | ||
| 2* | INSPECT TO SEE WHETHER MALFUNCTION (OPEN OR SHORT CIRCUIT) IS IN AIR INTAKE ACTUATOR, WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE Turn the ignition switch to the ON position. Measure the voltages at the following climate control unit terminals. Terminal 1M (24-pin, RECIRCULATE motor drive signal) Terminal 1K (24-pin, FRESH motor drive signal) (See FRONT CLIMATE CONTROL UNIT INSPECTION .) Are voltages normal? | Yes | Go to the next step. |
| No | Go to Step 4. | ||
| 3* | INSPECT TO SEE WHETHER MALFUNCTION (OPEN OR SHORT CIRCUIT) IS IN AIR INTAKE ACTUATOR OR WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) Measure the voltages at the following air intake actuator terminals. Terminal C (RECIRCULATE motor drive signal) Terminal A (FRESH motor drive signal) Are voltages as shown below? Terminal C: approx. 0.5 V during FRESH and approx. 10 V during RECIRCULATE Terminal A: approx. 10 V during FRESH and approx. 0.5 V during RECIRCULATE | Yes | Go to Step 7. |
| No | Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 9. | ||
| 4 | INSPECT TO SEE WHETHER MALFUNCTION IS IN AIR INTAKE ACTUATOR OR ELSEWHERE Disconnect the air intake actuator connector. Measure the voltages at the following climate control unit terminals. Terminal 1M (RECIRCULATE motor drive signal) Terminal 1K (FRESH motor drive signal) (See FRONT CLIMATE CONTROL UNIT INSPECTION .) Are voltages normal? | Yes | Inspect the air intake actuator, then go to Step 9. |
| No | Go to the next step. | ||
| 5 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE Disconnect the climate control unit connector. Measure the voltages at the following climate control unit terminals. Terminal 1M (RECIRCULATE motor drive signal) Terminal 1K (FRESH motor drive signal) Are voltages approx. 0 V? | Yes | Go to the next step. |
| No | Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 9. | ||
| 6 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GROUND BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE Turn the ignition switch to the LOCK position. Inspect for continuity at the following terminals between the climate control unit and ground. Terminal 1M (RECIRCULATE motor drive signal) Terminal 1K (FRESH motor drive signal) Is there continuity? | Yes | Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 9. |
| No | Go to the next step. | ||
| 7 | INSPECT AIR INTAKE LINK Inspect the air intake links for followings: Is there grease on link? Are the links securely and properly installed? Are the links free of obstructions and hindrances? Are the above items normal? | Yes | Go to the next step. |
| No | Apply grease to the links. If any the links are damaged, replace the air intake actuator, then go to Step 9. | ||
| 8 | INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR AIR INTAKE DOOR Inspect the A/C unit air intake door. Is the door free of obstructions, cracks, and damage? Are the doors securely and properly installed? Are the above items normal? | Yes | Replace the climate control unit, then go to the next step. |
| No | Remove obstruction, or install the doors in the proper position. If any doors are cracked or damaged, replace them, then go to the next step. | ||
| 9 | VERIFY REPAIR Does the air intake mode change smoothly? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT COOLANT TEMPERATURE Is the engine at operating temperature? | Yes | Go to the next step. |
| No | Warm up the engine, then go to Step 9. | ||
| 2 | INSPECT A/C UNIT AIR INTAKE SYSTEM Inspect the A/C unit air intake links, air intake cranks, air intake rods, air intake actuator, and wire clamp. Is there grease on links and cranks? Are links, cranks, and rods securely installed in their proper positions? Is wire clamp free of deformation? Are the above items normal? | Yes | Go to the next step. |
| No | Apply grease or install the links, cranks, and rods securely in their proper positions, repair or replace the air intake actuator or wire clamp, then go to Step 9. | ||
| 3 | VERIFY THAT AIR INTAKE WIRE FROM A/C UNIT IS POSITIONED SECURELY AND CORRECTLY (IF AVAILABLE) Is the air intake wire securely installed in the correct position in relation to the A/C unit air intake links? | Yes | Go to the next step. |
| No | Adjust the air intake wire or install securely in the correct position, then go to Step 9. | ||
| 4 | INSPECT CLIMATE CONTROL UNIT Is the climate control unit normal? | Yes | Go to the next step. |
| No | Repair or replace the climate control unit, then go to Step 9. | ||
| 5 | INSPECT A/C UNIT Is there any foreign material or obstruction in the A/C unit air intake doors? | Yes | Remove obstruction, then go to Step 9. |
| No | Go to the next step. | ||
| 6 | INSPECT A/C UNIT AIR INTAKE DOOR Is the A/C unit air intake door securely and properly installed? | Yes | Inspect the air intake door for cracks or damage, then go to the next step. |
| No | Install the air intake door securely in the proper position, then go to the next step. | ||
| 7 | INSPECT WIRING HARNESS BETWEEN CLIMATE CONTROL UNIT AND FRONT AIR MIX ACTUATOR Disconnect the front climate control unit connector (24-pin, 16-pin). Inspect following wiring harness and connectors for open, short or poor connection of terminals, (climate control unit-front air mix actuator) Driver-side 1A-G 1D-F 2F-E Passenger-side 1C-G 1E-F 2G-E Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunctioning part, then go to Step 9. |
| No | Go to the next step. | ||
| 8 | INSPECT HEATER LINE Inspect the heater lines. Is the heater piping free of damage and cracks? Are the heater piping connections free of engine coolant leakage? Are the heater piping connections securely tightened? Are the heater piping installation points on A/C unit free of engine coolant leakage? Are the above items normal? | Yes | Operation is normal. Recheck malfunction symptoms. |
| No | If heater piping connections are loose, tighten the connections to the specified torque. Repair or replace the heater piping, then go to the next step. | ||
| 9 | VERIFY REPAIR Does the unit operate in every temperature setting? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | COOL AIR BLOW OUT INSPECTION When both the A/C and fan switch in the front climate control unit are on, does cool air blow out from the front vent? | Yes | Go to the next step. |
| No | Go to Step 1 of troubleshooting index No. 8. | ||
| 2 | INSPECT FRONT CLIMATE CONTROL UNIT POWER SUPPLY FUSE FOR B+ SIGNAL Is the front climate control unit power supply fuse for B+ signal normal? | Yes | Go to the next step. |
| No | Inspect for a short to ground on blown fuse circuit. Repair or replace if necessary. Install appropriate amperage fuse. | ||
| 3 | INSPECT AIR INTAKE ACTUATOR Inspect the air intake actuator for followings. Is there grease on the link? Is the link securely and properly positioned? Is the link free of obstructions? Are the above items normal? | Yes | Go to the next step. |
| No | Apply grease or install the link properly and securely, remove obstruction, then go to Step 14. | ||
| *4 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND FRONT CLIMATE CONTROL UNIT FOR CONTINUITY Disconnect the front climate control unit connector (24-pin). Turn the ignition switch to the ON position. Measure the voltage at front climate control unit terminal 1B (B+ signal). Is the voltage approx. 12 V? | Yes | Go to the next step. |
| No | Repair the wiring harness between the fuse block and front climate control unit, then go to Step 14. | ||
| *5 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND GROUND FOR VOLTAGE Measure the voltage at front climate control unit terminal 1X (Ground). Is the voltage approx. 0V? | Yes | Go to the next step. |
| No | Repair the wiring harness between the front climate control unit and ground, then go to Step 14. | ||
| 6 | VERIFY WHETHER MALFUNCTION IS IN A/C UNIT AIR INTAKE DOOR OR ELSEWHERE Turn the ignition switch to the LOCK position. Connect the climate control unit connector (24-pin). Remove the air intake actuator. Turn the ignition switch to the ON position. Set the fan switch to 4th position. Does the air intake mode (RECIRCULATE, FRESH) change smoothly when the air intake link is operated by hand? | Yes | Go to the next step. |
| No | Go to Step 12. | ||
| 7 | INSPECT AIR INTAKE ACTUATOR Inspect the air intake actuator. (See AIR INTAKE ACTUATOR INSPECTION .) Is it normal? | Yes | Go to the next step. |
| No | Replace the air intake actuator, go to Step 14. | ||
| 8 | INSPECT AIR INTAKE SELECTOR SWITCH AND DEFROSTER SWITCH IN FRONT CLIMATE CONTROL UNIT Measure the voltage at front climate control unit connector (24-pin) terminals 1K and 1M. Is it normal? | Yes | Go to the next step. |
| No | Replace the front climate control unit, then go to Step 14. | ||
| *9 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR CONTINUITY Turn the ignition switch to the LOCK position. Is there continuity between the following front climate control unit terminals and air intake actuator terminals? Terminal A-Terminal 1K (FRESH signal) Terminal C-Terminal 1M (RECIRCULATE signal) | Yes | Go to the next step. |
| No | Repair the wiring harness between the front climate control unit and air intake actuator, then go to Step 14. | ||
| *10 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR SHORT TO GROUND Is there continuity between the following front climate control unit terminals and ground? Terminal 1M (RECIRCULATE signal) Terminal 1K (FRESH signal) | Yes | Repair the wiring harness between the front climate control unit and air intake actuator, then go to Step 14. |
| No | Go to the next step. | ||
| *11 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR SHORT TO B Turn the ignition switch to the ON position Measure the voltage at the following front climate control unit terminals. Terminal 1M (RECIRCULATE signal) Terminal 1K (FRESH signal) Is the voltage approx. 12 V? | Yes | Repair the wiring harness between the front climate control unit and air intake actuator, then go to Step 14. |
| No | Replace the front climate control unit, then go to Step 14. | ||
| 12 | INSPECT A/C UNIT AIR INTAKE DOOR Is there any foreign material or obstruction in the A/C unit air intake door? | Yes | Remove obstruction, then go to Step 14. |
| No | Go to the next step. | ||
| 13 | VERIFY THAT A/C UNIT AIR INTAKE DOOR IS POSITIONED SECURELY AND PROPERLY Is the A/C unit air intake door securely and properly positioned? | Yes | Inspect the air intake door for cracks or damage, then go to the next step. |
| No | Install the air intake door securely in the proper position, then go to the next step. | ||
| 14 | VERFY REPAIR Does the malfunction disappear? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT TO SEE WHETHER MALFUNCTION IS IN VENT MODE Does air blow out when in the rear vent mode? | Yes | Go to the Step 6. |
| No | Go to the next step. | ||
| 2 | VERIFY THAT REAR HEATER CONTROL USING FRONT CLIMATE CONTROL UNIT Turn the rear heater to ON and OFF using the front A/C control panel. Is it possible that the rear heater turns ON and OFF using the front climate control unit? | Yes | Go to Step 4. |
| No | Go to the next step. | ||
| 3 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN FRONT AND REAR CLIMATE CONTROL UNIT) OR ELSEWHERE Inspect for open, short or poor connection of terminals between front and rear climate control unit. 3B-B 3C-C 3E-E 3l-l Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunctioning part, then go to Step 10. |
| No | Go to the next step. | ||
| 4 | INSPECT VENT Is the vent clogged? | Yes | Remove obstruction, then go to Step 10. |
| No | Go to the next step. | ||
| 5 | VERIFY THAT REAR A/C DUCT IS INSTALLED Is the rear A/C duct properly installed? | Yes | Inspect the duct for clogging, deformation and air leakage, then go to Step 10. |
| No | Install the duct securely in the proper position, then go to Step 10. | ||
| 6 | INSPECT TO SEE WHETHER MALFUNCTION IS IN REAR HEAT MODE Does air blow out when in the rear heat mode? | Yes | Go to the next step. |
| No | Inspect the rear vent for clogging, then go to Step 10. | ||
| 7 | INSPECT REAR VENT Is the rear vent clogged? | Yes | Remove obstruction, then go to Step 10. |
| No | Go to the next step. | ||
| 8 | INSPECT REAR MODE ACTUATOR (See REAR AIRFLOW MODE ACTUATOR INSPECTION .) Is the rear airflow mode actuator normal? | Yes | Go to the next step. |
| No | Replace the rear airflow mode actuator, then go to Step 10. | ||
| 9 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN FRONT CLIMATE CONTROL UNIT AND REAR AIRFLOW MODE ACTUATOR) OR ELSEWHERE Inspect for open, short or poor connection of terminals between front climate control unit and rear airflow mode actuator. 2P-C 2B-A 2D-E 1L-F 1J-G Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunctioning part, then go to next step. |
| No | Replace the front climate control unit, go to the next step. | ||
| 10 | VERIFY REPAIR Does air blow from the rear A/C vent mode? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT TO SEE WHETHER MALFUNCTION IS IN REAR A/C UNIT OR ELSEWHERE Turn the ignition switch to the ON position. Turn the rear fan switch the ON position. Does the blower motor rotate smoothly? | Yes | Go to the next step. |
| No | Go to Step 3. | ||
| 2 | INSPECT REAR A/C UNIT INTAKE VENT Is the rear A/C unit intake vent clogged? | Yes | Remove obstruction, then go to Step 13. |
| No | Inspect if there are any obstructions in the rear A/C unit passage, then go to Step 13. | ||
| 3* | INSPECT TO SEE WHETHER MALFUNCTION IS IN REAR BLOWER RELAY SYSTEM OR REAR POWER MOS FET Turn the ignition switch to ON position. Turn the rear fan switch to OFF position. Measure the voltage at the following rear blower motor terminal. Terminal B (rear blower motor operation signal) Is the voltage normal (B+)? | Yes | Go to the Step 7. |
| No | Go to the next step. | ||
| 4* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FUSE BLOCK AND REAR BLOWER RELAY) OR ELSEWHERE Measure the voltage at the following rear relay terminals. Terminal D (IG2 signal) Terminal A (B+ signal) Is the voltage approx. 12 V? | Yes | Go to the next step. |
| No | If the terminal A voltage is not normal, repair or replace wiring harness between A/C 7.5 A fuse and rear blower relay. If the terminal D voltage is not normal, repair or replace wiring harness between R.HEATER 40 A fuse and rear blower relay. Then go to Step 13. | ||
| 5* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCIT BETWEEN REAR BLOWER RELAY AND GROUND) OR ELSEWHERE Measure the voltage at the following rear blower relay terminal. Terminal B (GND signal) Is the voltage approx. 0 V? | Yes | Go to the next step. |
| No | Repair or replace for open circuit between rear blower relay and GND, then go to Step 13. | ||
| 6* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN REAR BLOWER RELAY AND REAR BLOWER MOTOR) OR ELSEWHERE Measure the voltage at the following rear blower relay terminal. Terminal C (blower motor operation signal) Is the voltage approx. 12 V? | Yes | Repair or replace for open or short circuit between rear blower relay and rear blower motor, then go to Step 13. |
| No | Replace the rear blower relay, then go to Step 13. | ||
| 7* | INSPECT TO SEE WHETHER MALFUNCTION IS IN REAR BLOWER MOTOR OR ELSEWHERE Measure the voltage at the following rear blower motor terminal. Terminal A (blower motor operation signal) Is the voltage approx. 12 V? | Yes | Go to the next step. |
| No | Replace the rear blower motor, then go to Step 13. | ||
| 8* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN REAR BLOWER MOTOR AND REAR POWER MOS FET) OR ELSEWHERE Measure the voltage at the following rear power MOS FET terminal. Terminal B (blower motor operation signal) Is the voltage approx. 12 V? | Yes | Go to the next step. |
| No | Repair or replace for open or short circuit between rear blower motor and rear power MOS FET, then go to Step 13. | ||
| 9* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN REAR POWER MOS FET AND GROUND) OR ELSEWHERE Is there continuity at the following terminals? Terminal (wiring harness-side connector) A-GND | Yes | Go to the next step. |
| No | Repair or replace for open circuit between rear power MOS FET and GND, then go to Step 13. | ||
| 10 | INSPECT REAR A/C UNIT Inspect the fan in rear A/C unit. Is the fan free of interference with the rear A/C unit case? Is the fan free of foreign material and obstructions? Is the fan normal? | Yes | Go to the next step. |
| No | Remove obstruction, repair or replace the fan blower unit case, then go to Step 13. | ||
| 11* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN REAR POWER MOS FET AND CLIMATE CONTROL UNIT) OR ELSEWHERE Turn the ignition switch to LOCK position. Disconnect the front climate control unit connector (24-pin). Is there continuity following terminals at harness-side connector. Terminal D (rear power MOS FET) and terminal 1R (front climate control unit) Terminal C (rear power MOS FET) and terminal 1T (front climate control unit) | Yes | Replace the rear power MOS FET, then go to the next step. |
| No | Repair or replace for open circuit between the rear power MOS FET and the front climate control unit, then go to Step 13. | ||
| 12 | INSPECT TO SEE WHETHER MALFUNCTION IS IN REAR POWER MOS FET OR ELSEWHERE Is the air discharged from rear vent after replace the rear power MOS FET? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Replace the front climate control unit, then go to the next step. | ||
| 13 | VERIFY REPAIR Is the air discharged from rear vent? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT REFRIGERANT SYSTEM PERFORMANCE Perform the refrigerant system performance test on the front or rear A/C from the side which cool air does not blow. (See REFRIGERANT SYSTEM PERFORMANCE TEST .) Is the operation normal? | Yes | Operation is normal. (Recheck malfunction symptoms.) |
| No | Go to the next step. | ||
| 2 | INSPECT DRIVE BELT Inspect the drive belt. (See DRIVE BELT INSPECTION [MZI-3.7] .) Is it normal? | Yes | Go to the next step. |
| No | Adjust or replace the drive belt, then the next step. (See DRIVE BELT REMOVAL/INSTALLATION [MZI-3.7] .) | ||
| 3 | INSPECT REFRIGERANT PRESSURE SWITCH Inspect the refrigerant pressure switch. (See REFRIGERANT PRESSURE SWITCH INSPECTION .) Is it normal? | Yes | Go to the next step. |
| No | Replace the refrigerant pressure switch, then go to Step 25. (See REFRIGERANT PRESSURE SWITCH REMOVAL/INSTALLATION .) | ||
| 4 | CHECK TO SEE WHETHER MALFUNCTION IS IN BLOWER UNIT INTAKE AND CONDENSER OR ELSEWHERE Perform refrigerant pressure check. (See REFRIGERANT PRESSURE CHECK .) Are the refrigerant high-pressure and low-pressure values both high? | Yes | Go to the next step. |
| No | After recording the inspection results, go to Step 11. | ||
| 5 | INSPECT REFRIGERANT PRESSURE SWITCH Inspect the refrigerant pressure switch. (See REFRIGERANT PRESSURE SWITCH INSPECTION .) Is it normal? | Yes | Go to the next step. |
| No | Replace the refrigerant pressure switch, then go to Step 25. (See REFRIGERANT PRESSURE SWITCH REMOVAL/INSTALLATION .) | ||
| 6 | CHECK TO SEE WHETHER MALFUNCTION IS IN BLOWER UNIT INTAKE AND CONDENSER OR ELSEWHERE Perform refrigerant pressure check. (See REFRIGERANT PRESSURE CHECK .) Are the refrigerant high-pressure and low-pressure values both high? | Yes | Go to the next step. |
| No | After recording the inspection results, go to Step 11. | ||
| 7 | INSPECT COOLING FAN OPERATION Verify the cooling fan operation. (See FAN CONTROL MODULE INSPECTION [MZI-3.7] .) Is the cooling fan operation normal? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning location according to the inspection results. Then go to Step 25. | ||
| 8 | VISUALLY INSPECT CONDENSER Is the condenser fin clogged or obstructed by foreign material? | Yes | Remove the foreign material. Repair the condenser fin. Then go to Step 25. |
| No | Go to the next step. | ||
| 9 | CHECK TO SEE WHETHER MALFUNCTION IS IN EXPANSION VALVE OR ELSEWHERE Verify the condition of the low pressure hose of the front or rear A/C from the side which cool air does not blow while the A/C is operating. Is there frost or condensation adhering? | Yes | Replace the expansion valve. After performing the following servicing, go to Step 25. Adjust the compressor oil to the specified level. After discharging, charge with new refrigerant to the specified level. |
| No | Go to the next step. | ||
| 10 | INSPECT AIR MIX DOOR RELATED PART INSTALLATION Remove the A/C unit of the front or rear A/C from the side which cool air does not blow. (See FRONT A/C UNIT REMOVAL/INSTALLATION .) (See REAR A/C UNIT REMOVAL/INSTALLATION .) Are the air mix link, air mix crank, and air mix rod of the A/C unit correctly and securely installed to their positions? | Yes | Adjust the compressor oil to the specified amount, then go to Step 25. (See A/C COMPRESSOR REMOVAL/INSTALLATION .) |
| No | Repair or install the links, cranks and rods securely in the proper position, then go to Step 25. | ||
| 11 | CHECK TO SEE WHETHER MALFUNCTION IS IN BLOWER UNIT AND REFRIGERANT PRESSURE LINE OR ELSEWHERE Are the refrigerant high-pressure and low-pressure values low? | Yes | Go to the next step. |
| No | Go to Step 18. | ||
| 12 | INSPECT BLOWER UNIT FOR BLOCKAGE Is the blower unit intake and air filter of the front or rear A/C from the side which cool air does not blow clogged? | Yes | Remove the cause of the clogging. Replace the air filter if it is clogged. (See AIR FILTER REMOVAL/INSTALLATION .) Then go to Step 25. |
| No | Go to the next step. | ||
| 13 | CHECK TO SEE WHETHER MALFUNCTION IS REFRIGERANT LINE LEAKAGE OR ELSEWHERE Verify if there is gas leakage from the system hoses using the gas leak tester. Is there gas leakage? | Yes | If there is leakage from a system hose connection area, go to Step 15. If there is leakage other than from a system hose connection area, go to Step 17. |
| No | Go to the next step. | ||
| 14 | VISUALLY INSPECT REFRIGERANT LINE Is a system hose crushed? | Yes | Replace the crushed system hose. (See REFRIGERANT LINE REMOVAL/INSTALLATION .) After performing the following servicing, go to Step 25. Adjust the compressor oil to the specified level. After discharging, charge with new refrigerant to the specified level. |
| No | Go to Step 24. | ||
| 15 | CHECK TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT LINE JOINT LOOSE OR O-RING Tighten the system hose connection area to the specified torque. (See REFRIGERANT LINE REMOVAL/INSTALLATION .) Has the leakage stopped? | Yes | Go to the next step. |
| No | Go to Step 17. | ||
| 16 | VISUALLY INSPECT REFRIGERANT LINE Is a system hose crushed? | Yes | Replace the crushed system hose. (See REFRIGERANT LINE REMOVAL/INSTALLATION .) After performing the following servicing, go to Step 25. Adjust the compressor oil to the specified level. After discharging, charge with new refrigerant to the specified level. |
| No | Adjust the compressor oil to the specified amount, then go to Step 25. (See A/C COMPRESSOR REMOVAL/INSTALLATION .) | ||
| 17 | VISUALLY INSPECT REFRIGERANT LINE Is a system hose crushed? | Yes | Replace the O-ring of the leaking area. Replace the crushed system hose. (See REFRIGERANT LINE REMOVAL/INSTALLATION .) After performing the following servicing, go to Step 25. Adjust the compressor oil to the specified level. After discharging, charge with new refrigerant to the specified level. |
| No | Replace the O-ring of the leaking area. After performing the following servicing, go to Step 25. Adjust the compressor oil to the specified level. After discharging, charge with new refrigerant to the specified level. | ||
| 18 | CHECK TO SEE WHETHER MALFUNCTION IS IN CONDENSER AND EXPANSION VALVE OR ELSEWHERE Do the results of the refrigerant pressure inspection in Step 4 indicate vacuum on the low pressure side and extremely low pressure on the high pressure side? | Yes | Go to the next step. |
| No | Go to Step 22. | ||
| 19 | CHECK TO SEE WHETHER MALFUNCTION IS IN EXPANSION VALVE AND RECEIVER/DRIER OR ELSEWHERE Is there no refrigerant pressure on the low pressure side, or is it normal? | Yes | Replace the condenser. (See CONDENSER REMOVAL/INSTALLATION .) After performing the following servicing, go to Step 25. Adjust the compressor oil to the specified level. After discharging, charge with new refrigerant to the specified level. |
| No | Go to the next step. | ||
| 20 | CHECK TO SEE WHETHER MALFUNCTION IS IN CONDENSER OR EXPANSION VALVE Verify the condition of the outlet hose on the condenser high pressure side. Is there condensation in the hose? | Yes | Replace the condenser. (See CONDENSER REMOVAL/INSTALLATION .) After performing the following servicing, go to Step 25. Adjust the compressor oil to the specified level. After discharging, charge with new refrigerant to the specified level. |
| No | Go to the next step. | ||
| 21 | INSPECT EXPANSION VALVE Remove the expansion valve of the front or rear A/C from the side which cool air does not blow and verify its condition. Is there refrigerant leakage or valve clogging? | Yes | If there is foreign matter clogging the valve, remove the foreign matter. If there is refrigerant leakage or clogging, replace the expansion valve. Perform discharge, charge with new refrigerant, and then go to Step 25. |
| No | Install the expansion valve, then go to Step 24. | ||
| 22 | CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR ELSEWHERE Do the results of the refrigerant pressure inspection in Step 6 indicate low pressure on the high pressure side and high pressure on the low pressure side? | Yes | Replace the A/C compressor, then go to Step 25. (See A/C COMPRESSOR REMOVAL/INSTALLATION .) |
| No | Go to the next step. | ||
| 23 | INSPECT EVAPORATIVE TEMPERATURE SENSOR Inspect the evaporator temperature sensor of the front or rear A/C from the side which cool air does not blow. (See FRONT EVAPORATOR TEMPERATURE SENSOR INSPECTION .) (See REAR EVAPORATOR TEMPERATURE SENSOR INSPECTION .) Is it normal? | Yes | Verify the evaporator temperature sensor position. (See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY .) (See REAR A/C UNIT DISASSEMBLY/ASSEMBLY .) Then go to Step 25. |
| No | Replace the evaporator temperature sensor, then go to Step 25. (See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY .) (See REAR A/C UNIT DISASSEMBLY/ASSEMBLY .) | ||
| 24 | INSPECT AIR MIX DOOR RELATED PART INSTALLATION Remove the A/C unit of the front or rear A/C from the side which cool air does not blow. (See FRONT A/C UNIT REMOVAL/INSTALLATION .) (See REAR A/C UNIT REMOVAL/INSTALLATION .) Are the air mix link, air mix crank, and air mix rod of the A/C unit correctly and securely installed to their positions? | Yes | Go to the next step. |
| No | Repair or install the links, cranks and rods securely in the proper position, then go to the next step. (See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY .) (See REAR A/C UNIT DISASSEMBLY/ASSEMBLY .) | ||
| 25 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR If the refrigerant discharged during inspection has not been recharged, discharge and charge with new refrigerant to the specified level. Does cool air blow out? (Are results of refrigerant system performance test normal?) | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT AIR FLOW FROM VENTS Does air blow out? | Yes | Go to the next step. |
| No | Go to Step 1 of troubleshooting indexes No. 1 and 2. | ||
| 2 | INSPECT A/C COMPRESSOR OPERATION Start engine. Turn A/C switch and fan switch on. Does A/C compressor operate? | Yes | Go to Step 1 of troubleshooting index No. 7. |
| No | Go to the next step. | ||
| 3 | INSPECT FOR DTC IN PCM Inspect for DTCs related to the PCM onboard diagnostic system. Are any DTCs displayed? | Yes | Go to appropriate inspection procedure. |
| No | Go to the next step. | ||
| 4 | INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR ELSEWHERE Does cool air blow out when terminal 1Q of front climate control unit connector (24-pin, A/C signal) is grounded? | Yes | Replace climate control unit, then go to Step 16. |
| No | Release short, then go to the next step. | ||
| 5* | INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C SIGNAL CIRCUIT (BETWEEN REFRIGERANT PRESSURE SWITCH AND PCM) OR ELSEWHERE Test voltage at following terminal of refrigerant pressure switch. Terminal B (A/C signal) Is voltage approx. 12 V? | Yes | Go to Step 7. |
| No | Go to the next step. | ||
| 6* | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN REFRIGERANT PRESSURE SWITCH AND PCM) OR PCM Test voltage at A/C signal terminal of PCM. Is voltage approx. 12 V? | Yes | Repair wiring harness between PCM and refrigerant pressure switch, then go to Step 16. |
| No | Inspect PCM, then go to Step 16. | ||
| 7 | INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH, REFRIGERANT AMOUNT, OR ELSEWHERE Does cool air blow out when terminals B and C of refrigerant pressure switch connector are shorted? | Yes | Go to the next step. |
| No | Go to Step 9. | ||
| 8 | INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH OR REFRIGERANT AMOUNT Inspect refrigerant pressure switch. Is it okay? | Yes | If refrigerant amount is empty, replace condenser, vacuum refrigerant line more than 30 min by vacuum pump, and add refrigerant to specified level, then go to Step 16. |
| No | Replace refrigerant pressure switch, then go to Step 16. | ||
| 9 | INSPECT TO SEE WHETHER MALFUNCTION (SHORT CIRCUIT) IS IN A/C CONTROL SIGNAL CIRCUIT (BETWEEN A/C RELAY AND PCM) OR ELSEWHERE Does cool air blow out when terminal E of A/C relay connector (A/C control signal) is grounded? | Yes | Release short, then go to the next step. |
| No | Go to Step 11. | ||
| 10* | INSPECT TO SEE WHETHER MALFUNCTION (OPEN OR SHORT CIRCUIT) IS IN PCM OR WIRING HARNESS (BETWEEN A/C RELAY AND PCM) Test voltage at the A/C relay control signal terminal of PCM. Is voltage approx. 12 V? | Yes | Inspect PCM, then go to Step 16. |
| No | Repair wiring harness between A/C relay and PCM, then go to Step 16. | ||
| 11* | INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR ELSEWHERE Test voltage at the following terminal of magnetic clutch thermal protector. Terminal B (magnetic clutch operation signal) Is voltage approx. 12 V? | Yes | Inspect magnetic clutch, then go to Step 16. |
| No | Go to the next step. | ||
| 12 | INSPECT FUSE Are A/C relay power supply fuses okay? | Yes | Go to the next step. |
| No | Replace fuse, then go to Step 16. If fuse burns out immediately, go to the next step. | ||
| 13 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND A/C RELAY FOR LACK OF CONTINUITY Test voltages at following terminals of A/C relay. Terminal A (A/C relay control signal) Terminal C (A/C control signal) Are voltages approx. 12 V? | Yes | Go to the next step. |
| No | Repair wiring harness between fuse block and A/C relay, then go to Step 16. | ||
| 14 | INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR WIRING HARNESS (BETWEEN A/C RELAY AND MAGNETIC CLUTCH) AND EVAPORATOR TEMPERATURE SENSOR Test voltage at the following terminal of A/C relay. Terminal D (magnetic clutch operation signal) Is voltage approx. 12 V? | Yes | Inspect wiring harness between A/C relay and magnetic clutch. If above wiring harness is OK, go to the next step. If above wiring harness malfunctions, repair wiring harness, then go to Step 16. |
| No | Replace A/C relay, then go to Step 16. | ||
| 15 | INSPECT EVAPORATOR TEMPERATURE SENSOR Inspect evaporator temperature sensor. Is it okay? | Yes | Go to the next step. |
| No | Replace evaporator temperature sensor, then go to the next step. | ||
| 16 | VERIFY REPAIR Does cool air blow out from front/rear vents? (Are the results of refrigerant system performance test okay?) | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs. | ||
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | CHECK A/C COMPRESSOR VANE NOISE Is there a jingling, popping, beeping, or buzzing sound (A/C compressor vane noise)? | Yes | Go to Step 5. |
| No | Go to the next step. | ||
| 2 | INSPECT A/C COMPRESSOR SLIPPAGE NOISE Is there a squeaking or whirling sound (A/C compressor slippage noise)? | Yes | Go to Step 14. |
| No | Go to the next step. | ||
| 3 | INSPECT A/C COMPRESSOR INTERFERENCE NOISE Is there a rattling or vibrating sound (interference noise)? | Yes | Go to Step 18. |
| No | Go to the next step. | ||
| 4 | INSPECT MAGNETIC CLUTCH OPERATION NOISE Is there a clicking sound (magnetic clutch operation noise)? | Yes | Adjust clearance between pressure plate of magnetic clutch and A/C compressor pulley, then go to Step 19. (See MAGNETIC CLUTCH CLEARANCE INSPECTION .) |
| No | Condition is normal. (Recheck malfunction symptoms.) | ||
| 5 | INSPECT A/C COMPRESSOR NOISE TIME Is noise heard continuously for more than 3 s after A/C compressor comes on? | Yes | Go to the next step. |
| No | Condition is normal. (Noise occurs for 2-3 s immediately after A/C compressor turns on.) | ||
| 6 | INSPECT IDLE SPEED Inspect idle speed. (See ENGINE TUNE-UP [MZI-3.7] .) Is it okay? | Yes | Go to the next step. |
| No | Follow the applicable repair instruction described in ENGINE - MECHANICAL [MZI-3.7] article, then go to Step 19. | ||
| 7 | INSPECT REFRIGERANT AMOUNT Inspect refrigerant amount. Is it okay? | Yes | Go to Step 10. |
| No | Go to the next step. | ||
| 8 | INSPECT REFRIGERANT LINES Inspect refrigerant lines. Is piping free of damage and cracks? Are piping connections free of oil grime? (Visual inspection) Are piping connections free of gas leakage? Are piping installation points on condenser free of gas leakage? Are piping installation points on receiver/drier free of gas leakage? Are piping installation points on A/C compressor free of gas leakage? Are piping installation points on A/C unit free of gas leakage Perform gas leak inspection using gas leak tester. Are above items okay? | Yes | Go to the next step. |
| No | If piping or A/C component(s) is damaged or cracked, replace then go to Step 19. If there is gas leakage, repair or replace connection and replace condenser (1) , then go to Step 19. | ||
| 9 | INSPECT EVAPORATOR PIPING CONNECTIONS IN A/C UNIT FOR GAS LEAKAGE Are piping connections for evaporator in A/C unit free of gas leakage? | Yes | Adjust refrigerant amount to specified level, then go to Step 19. |
| No | If piping is damaged or cracked, replace then go to Step 19. If there is gas leakage, repair or replace connection and replace condenser (1) , then go to Step 19. | ||
| 10 | CHECK TO SEE WHETHER MALFUNCTION IS IN COMPRESSOR OIL OR ELSEWHERE Add 20 ml {20 cc, 0.8 fl. oz.} of compressor oil. Is noise heard when racing engine? | Yes | Go to the next step. |
| No | Troubleshooting completed. Explain repair to customer. | ||
| 11 | CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR ELSEWHERE Drain compressor oil. Is it contaminated with metal particles? | Yes | Go to the next step. |
| No | Replace A/C compressor, then go to Step 19. | ||
| 12 | CHECK TO SEE WHETHER MALFUNCTION IS SOMEWHERE IN A/C SYSTEM OR ELSEWHERE Is compressor oil whitish and mixed with water? | Yes | Replace entire A/C system (excluding heater), then go to Step 19. |
| No | Go to the next step. | ||
| 13 | INSPECT A/C COMPRESSOR OIL Is compressor oil darker than normal and contaminated with aluminum chips? | Yes | Replace A/C compressor and condenser, then go to Step 19. (Since A/C compressor may be worn and receiver/drier may be clogged, replacement of receiver/drier is necessary.) |
| No | Condition is normal. Recheck malfunction symptoms. | ||
| 14 | CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR ELSEWHERE Is noise heard immediately after A/C compressor is stopped? | Yes | Replace A/C compressor, then go to Step 19. (A/C compressor discharge valve left open) |
| No | Go to the next step. | ||
| 15 | INSPECT DRIVE BELT Inspect drive belt. (See DRIVE BELT INSPECTION [MZI-3.7] .) Is it okay? | Yes | Go to the next step. |
| No | Adjust or replace drive belt, then go to Step 19. | ||
| 16 | INSPECT DRIVE BELT CONDITION Is drive belt worn? Does it have foreign material imbedded in it, or have oil on it? | Yes | Remove obstruction, remove oil, or replace drive belt, then go to Step 19. |
| No | Go to the next step. | ||
| 17 | INSPECT MAGNETIC CLUTCH Inspect magnetic clutch. (See MAGNETIC CLUTCH INSPECTION .) Is it okay? | Yes | Replace A/C compressor (excluding pressure plate, A/C compressor pulley, and stator), then go to Step 19. |
| No | Replace magnetic clutch, then go to Step 19. | ||
| 18 | CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR REFRIGERANT LINES Is noise emitted from A/C compressor? | Yes | Visually inspect A/C compressor, replace appropriate parts if necessary, then go to the next step. |
| No | If noise is due to refrigerant lines, repair detached or missing clips, tighten loose bolts, then go to the next step. | ||
| 19 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR Has A/C compressor noise stopped? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs. | ||
| (1) If there is gas leakage, air enters into the A/C system. The desiccant within the receiver/drier absorbs the moisture from the air and becomes saturated. If the A/C system is used in this condition, the inside of the A/C compressor will begin to rust due to this moisture, which may cause lock up or noise to occur. Therefore, replacement of the receiver/drier is necessary. | |||
| (1) | If there is gas leakage, air enters into the A/C system. The desiccant within the receiver/drier absorbs the moisture from the air and becomes saturated. If the A/C system is used in this condition, the inside of the A/C compressor will begin to rust due to this moisture, which may cause lock up or noise to occur. Therefore, replacement of the receiver/drier is necessary. |
DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | CHECK SYMPTOM Turn on the front A/C. Perform the dual A/C control function for driver and passenger-side individually. Is it either of cannot the temperature control on driver seat side or front passenger seat side? | Yes | Go to the next step. |
| No | Go to Step 8. | ||
| 2 | INSPECT TO SEE WHETHER MALFUNCTION IS IN AIR MIX DOOR OR ELSEWHERE Turn on the front A/C Change temperature control for suspect side seat at the dual mode. Does the suspect side air mix door move smoothly? | Yes | Go to the next step. |
| No | Go to Step 6. | ||
| 3 | INSPECT AIR MIX DOOR Inspect the suspect side air mix door. Is the fan free of interfere with the suspect side A/C unit case? Is the fan free of foreign material and obstruction? Is the air mix door normal? | Yes | Go to the next step. |
| No | Remove the obstruction or replace the suspect side A/C unit case, then go to Step 9. | ||
| 4 | INSPECT FRONT AIR MIX ACTUATOR Inspect the suspect side front air mix actuator. Is the front air mix actuator normal? | Yes | Go to the next step. |
| No | Replace the suspect front air mix actuator, then go to Step 9. | ||
| 5 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN AIR MIX ACTUATOR AND FRONT CLIMATE CONTROL UNIT) OR ELSEWHERE Inspect for open, short or poor connection of terminals between the suspect front air mix actuator and front climate control unit. Terminal 1A (front climate control unit)- terminal G (driver-side front air mix actuator) Terminal 1D (front climate control unit)- terminal F (driver-side front air mix actuator) Terminal 1E (front climate control unit)- terminal F (passenger-side front air mix actuator) Terminal 1C (front climate control unit)- terminal G (passenger-side front air mix actuator) Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunction part, then go to Step 9. |
| No | Replace the front climate control unit, then go to Step 9. | ||
| 6* | INSPECT FRONT AIR MIX ACTUATOR POSITION SENSOR Inspect the suspect side front air mix actuator position sensor. Is the front air mix actuator position sensor normal? | Yes | Go to the next step. |
| No | Replace the suspect front air mix actuator position sensor, then go to Step 9. | ||
| 7 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN AIR MIX ACTUATOR POSITION SENSOR AND FRONT CLIMATE CONTROL UNIT) OR ELSEWHERE Inspect for open, short or poor connection of terminals between the suspect front air mix actuator position sensor and front climate control unit. Terminal 2F (front climate control unit)- terminal E (driver-side front air mix actuator position sensor) Terminal 2G (front climate control unit)- terminal E (passenger-side front air mix actuator position sensor) Terminal 2B (front climate control unit)- terminal A (each side front air mix actuator position sensor) Terminal 2P (front climate control unit)- terminal C (each side front air mix actuator position sensor) Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunction part, then go to Step 9. |
| No | Replace the front climate control unit, then go to Step 9. | ||
| 8 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN FRONT CLIMATE CONTROL UNIT AND AIR MIX ACTUATOR POSITION SENSOR) OR ELSEWHERE Inspect for open, short or poor connection of terminals between the front climate control unit and front air mix actuator position sensor. Terminal 2B (front climate control unit)- terminal A (each front air mix actuator position sensor) Terminal 2P (front climate control unit)- terminal C (each front air mix actuator position sensor) Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunction part, then go to the next step. |
| No | Replace the front climate control unit, then go to the step. | ||
| 9 | CONFIRM THAT MALFUNCTION SYMPTOMS DOES NOT RECUR AFTER REPAIR Does the temperature adjust individually for driver seat and front passenger seat? | Yes | Troubleshooting completed. Explain repairs to customer. |
| No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs. | ||
DIAGNOSTIC PROCEDURE