Reading and Clearing Diagnostic Trouble Codes

DIAGNOSIS SYSTEM (AUTO AMP.)

Diagnosis Description


SELF-DIAGNOSIS SYSTEM

The self-diagnosis system is built into the auto amp. to quickly locate the cause of malfunctions.

SELF-DIAGNOSIS FUNCTION

The self-diagnosis system diagnoses sensors, door motors, blower motor, etc. by system line.
- Switching to self-diagnosis STEP-1 to 4.
Shifting from normal control to the self-diagnosis system is accomplished by starting the engine (turning the ignition switch from OFF to ON) and pressing A/C switch for at least 5 seconds. The A/C switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system is canceled by either pressing intake switch or turning the ignition switch OFF. Shifting to the next step is accomplished by means of turning fan control dial, as required.






FUNCTION CONFIRMATION PROCEDURE


1. SET IN SELF-DIAGNOSIS MODE






1.Set the mode control dial to AUTO position (1).
2.Set the fan control dial to OFF position (2).
3.Turn ignition switch ON.
4.Set in self-diagnosis mode as per the following. Press A/C
switch for at least 5 seconds within 10 seconds after starting engine (ignition switch is turned ON.).

CAUTION:
If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a result, the system may generate an error even when operation is normal. To avoid this, start engine before performing this diagnosis.
- GO TO 2.

2. STEP-1: INDICATOR ARE CHECKED






Check all indicator illumination.
Is the inspection result normal?
YES- GO TO 3.
NO- Malfunctioning fan control dial or auto amp. Refer to
"Inspection procedure" Inspection Procedure.

3. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT






1.Turn fan control dial to AUTO position (1).

CAUTION:
When switched to STEP-2, indicator of REC position (2)
blinks for approximately 25 seconds.
2.Check A/C switch indicator (3) illumination.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 7.

4. STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED






1.Turn fan control dial to 1st - 12th speed (1).

CAUTION:
When switched to STEP-3, indicator of REC position blinks for approximately 50 seconds.
2.Check A/C switch indicator (2) illumination.
Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 8.

5. STEP-4: OPERATION OF EACH ACTUATOR IS CHECKED






1.Turn fan control dial to 13th - 25th speed (1).
2.Change operation status of air conditioner by changing mode control dial position.
- GO TO 6.

6. CHECK ACTUATORS

Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and compressor operation.





Checks must be made visually, by listening to any noise, or by touching air outlets with hand, etc. for improper operation.
*1: STEP-Nos. 41 to 46 are for differentiation and they are not displayed.
*2: FOOT position during automatic control. Refer to "Foot Position Setting Trimmer" Foot Position Setting Trimmer.
Is the inspection result normal?
YES- 1.Turn ignition switch OFF or intake switch ON.
2.INSPECTION END
NO- - Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to "Diagnosis Procedure" Automatic Air Conditioning.
- Intake door does not change.
Go to Intake Door Motor Circuit. Refer to"Diagnosis Procedure" Automatic Air Conditioning.
- Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to "Diagnosis Procedure" Automatic Air Conditioning.
- Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to "Diagnosis Procedure" Automatic Air Conditioning.
- Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to "Diagnosis Procedure" Automatic Air Conditioning.

7. CHECK MALFUNCTIONING SENSOR






Refer to the following chart.

CAUTION:
When switched to STEP-2, indicator of REC position blinks for approximately 25 seconds.





*1: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise indicator of A/C switch does not indicate despite that sunload sensor is functioning normally.
*2: "Diagnosis Procedure" Ambient Sensor.
*3: "Diagnosis Procedure" In-Vehicle Sensor.
*4: "Diagnosis Procedure" Sunload Sensor.
*5: "Diagnosis Procedure" Automatic Air Conditioning.
*6: "Diagnosis Procedure" Automatic Air Conditioning.
- INSPECTION END

8. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH






Mode and/or intake door motor PBR (s) is/are malfunctioning.

CAUTION:
When switched to STEP-3, indicator of REC position blinks for approximately 50 seconds.





*1: "Diagnosis Procedure" Automatic Air Conditioning.
*2: "Diagnosis Procedure" Automatic Air Conditioning.
- INSPECTION END