FOREWORD
- The areas for inspection (steps) are given according to various circuit malfunctions. Use the following chart to verify the symptoms of the trouble in order to diagnose the appropriate area.
NO. 1 INSUFFICIENT AIR/NO AIR BLOWN FROM VENTS [L3, AJ]
| 1 | Insufficient air (or no air) blown from vents. |
|---|---|
| DESCRIPTION | Problem with each vent or duct or both. Airflow mode does not change. |
| POSSIBLE CAUSE | Malfunction in airflow mode actuator Malfunction in VENT mode system Malfunction in HEAT mode system Malfunction in DEFROSTER mode system |
POSSIBLE CAUSE DESCRIPTION CHART (INSUFFICIENT AIR/NO AIR BLOWN FROM VENTS [L3, AJ])
Full-auto Air Conditioner
| 2 | Amount of air blown from vents does not change. |
|---|---|
| DESCRIPTION | Malfunction in blower system. |
| POSSIBLE CAUSE | Malfunction in blower unit Malfunction in blower motor Malfunction in PWM unit system Malfunction in climate control unit |
POSSIBLE CAUSE DESCRIPTION CHART (AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [L3, AJ])
- When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.
Manual Air Conditioner
| 3 | Amount of air blown from vents does not change. |
|---|---|
| DESCRIPTION | Malfunction in blower system. |
| POSSIBLE CAUSE | Blower relay, blower motor, resistor, fan switch malfunction Blower unit malfunction |
POSSIBLE CAUSE DESCRIPTION CHART (AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [L3, AJ])
NO. 4 AIR INTAKE MODE DOES NOT CHANGE [L3, AJ]
| 4 | Air intake mode does not change. |
|---|---|
| DESCRIPTION | Air intake mode does not change when switching REC/FRESH mode. |
| POSSIBLE CAUSE | Malfunction in air intake actuator Malfunction in air intake door |
POSSIBLE CAUSE DESCRIPTION CHART (AIR INTAKE MODE DOES NOT CHANGE [L3, AJ])
- When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.
- When checking intake motor drive signal, test it within 20 s after switching REC/FRESH mode. For that signal turns off after 20 s .
NO. 5 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT [L3, AJ]
| 5 | No temperature control with climate control unit. |
|---|---|
| DESCRIPTION | Malfunction in A/C unit or climate control unit air mix system or both. |
| POSSIBLE CAUSE | A/C unit air mix link, air mix crank, air mix rod, air mix wire, wire clamp malfunction Climate control unit rack-and-pinion, air mix wire malfunction A/C unit air mix door malfunction Heater piping malfunction |
POSSIBLE CAUSE DESCRIPTION CHART (NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT [L3, AJ])
NO. 6 WINDSHIELD FOGGED [L3, AJ]
- When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and undamaged.
- When checking intake motor drive signal, test it within 20 s after switching REC/FRESH mode. For that signal turns off after 20 s . POSSIBLE CAUSE DESCRIPTION CHART (WINDSHIELD FOGGED [L3, AJ]) 6 Windshield fogged. DESCRIPTION A/C compressor does not operate when airflow mode is in DEFROSTER or HEAT/DEF modes. Air intake mode does not change to FRESH when airflow mode is in DEFROSTER or HEAT/DEF modes. POSSIBLE CAUSE Climate control unit (B+ signal) system malfunction Air intake actuator malfunction Climate control unit (RECIRCULATE, FRESH signal) system malfunction Malfunction in blower unit air intake doors
NO. 7 AIR FROM VENTS COLD ENOUGH [L3, AJ]
| 7 | Air from vents not cold enough. |
|---|---|
| DESCRIPTION | Magnetic clutch operates but A/C system malfunctions. |
| POSSIBLE CAUSE | Drive belt malfunction Malfunction in blower unit or condenser Malfunction in receiver/drier or expansion valve (valve closes too much) Malfunction in refrigerant lines (Steps 10, 11) A/C compressor system malfunction, insufficient compressor oil Over filling of compressor oil, malfunction in expansion valve or A/C unit air mix link system |
POSSIBLE CAUSE DESCRIPTION CHART (AIR FROM VENTS COLD ENOUGH [L3, AJ])
NO. 8 NO COOL AIR [L3, AJ]
| 8 | No cool air |
|---|---|
| DESCRIPTION | Magnetic clutch does not operate. |
| POSSIBLE CAUSE | Malfunction in PCM A/C cut control system Malfunction in climate control unit Malfunction in refrigerant pressure switch Malfunction in PCM (A/C signal) Malfunction in PCM (IG1 signal) Malfunction in A/C compressor) Malfunction in A/C relay Malfunction in evaporator temperature sensor |
POSSIBLE CAUSE DESCRIPTION CHART (NO COOL AIR [L3, AJ])
- When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.