INSPECTION
Before performing diagnosis, check the following items which might affect engine problems.
Scheme 25
- Measure battery voltage and specific gravity of electrolyte. Standard voltage: 12 V Specific gravity: Above 1.260
- Check the condition of the fuses for A/C, heater and other fuses.
- Check the condition of the harnesses and harness connectors connection. (Scheme 25): Checking Harnesses & Harness Connectors
Scheme 26
Scheme 27
Scheme 28
- Make sure that the aspirator hose is securely connected to the heater unit by inserting a hand from the driver's compartment and secure as necessary.
- Turn ignition switch to ON.
- Push "DEF" switch and then blower fan switch to turn the blower fan to maximum speed. (Scheme 26): Identifying "DEF" Switch & Blower Fan Switch
- Firmly hold a thin thread (b) in front of the in vehicle sensor suction port (a) for the auto A/C control unit and check that the thread moves towards the port indicating that air is being sucked into the port. NOTE: Ensure the thread does not get sucked into the port. Hold the thread approximately 5 mm (0.02 in) away from the port when the suction force is not very strong. (Scheme 27): Holding Thin Thread In Front Of Vehicle Sensor Suction Port For Auto A/C Control Unit
- If the thread does not move at all, remove the auto A/C control unit. See «A/C UNIT»(ref-12288-S39648424722000121900000). Check for improper connection of the aspirator hose (a) and auto A/C control unit and secure as necessary. (Scheme 28): Checking For Improper Connection Of Aspirator Hose & Auto A/C Control Unit
TROUBLE SYMPTOM
- "Set" temperature is not indicated on display, switch LEDs are faulty and switches do not operate.
- Self-diagnosis system does not operate.
Wiring Diagram - A/C And/Or Self-Diagnosis Systems Do Not Operate. Scheme 29
Diagnostic Chart - A/C And/Or Self-Diagnosis Systems Do Not Operate. Scheme 30
- Blower motor is not rotating.
- Blower motor is not rotating in "HI".
Wiring Diagram - Blower Motor Is Not Rotating. Scheme 31
Diagnostic Chart - Blower Motor Is Not Rotating. Scheme 32
FRESH/RECIRC mode door is not changed.
Wiring Diagram - Fresh/Recirc Is Not Changed. Scheme 33
Diagnostic Chart - Fresh/Recirc Is Not Changed. Scheme 34
Wiring Diagram - Compartment Temperature Is Not Changed Or A/C System Does Not Respond Quickly. Scheme 35
Diagnostic Chart - Compartment Temperature Is Not Changed Or A/C System Does Not Respond Quickly (1 Of 2). Scheme 36
Diagnostic Chart - Compartment Temperature Is Not Changed Or A/C System Does Not Respond Quickly (2 Of 2). Scheme 37
List of Diagnostic Trouble Code
| DTC | Description |
|---|---|
| CODE 21, -21 | AMBIENT SENSOR |
| CODE 22, -22 | IN-VEHICLE SENSOR |
| CODE 24, -24 | EVAPORATOR SENSOR |
| CODE 25, -25 | SUNLOAD SENSOR |
DIAGNOSTIC TROUBLE CODES (DTC) LIST
Trouble Code Chart - For Sensor & Potention Meter. Scheme 38
Trouble Code Chart - For Mode Door Position Switch. Scheme 39
Fan speed, outlets and inlets are not switched when AUTO or ECON switch is ON.
Wiring Diagram - Trouble Code 21 Or -21 (Ambient Sensor). Scheme 40
Diagnostic Chart - Trouble Code 21 Or -21 (Ambient Sensor). Scheme 41
When turning AUTO switch to ON, blower fan speed, outlet port and inlet port is not changed.
If trouble code 22 or -22 appears on the display, replace the A/C control module. The in-vehicle sensor is built into the A/C control module and cannot be replaced as a single unit.
Wiring Diagram - Trouble Code 24 Or -24 (Evaporator Sensor). Scheme 42
Diagnostic Chart - Trouble Code 24 Or -24 (Evaporator Sensor). Scheme 43
- Sensor identified that sunlight is at maximum. Then, A/C system is controlled to COOL side.
- Sensor identified that sunlight is at minimum. Then, A/C system is controlled to HOT side. NOTE: When the sunload sensor is checked inside the passenger compartment or in the shade, code "25" may appear on the indicator. Always check the sunload sensor in a place where it senses direct sunlight.
