Reading Diagnostic Trouble Codes

Diagnosis System

Warning For A/C Compressor Lock
If compressor lock occurs during air conditioning operation, the [A/C] switch indicator on the air conditioning control assembly starts blinking to warn the driver.
When this occurs, check for compressor lock (code 22) using diagnostic trouble code check then proceed to inspect the circuit or the component.





List Of Operation Methods
By operating each of the air conditioning control switches as shown in the diagram, it is possible to enter the diagnosis check mode.





Indicator Check
1. Turn the ignition switch on while pressing the air conditioning control [AUTO] switch and REC switch simultaneously.





2. Check that all the indicators light up and go off at 1 second intervals 4 times in succession.
3. Check that the buzzer sounds when the indicators light up in 2.

HINT:
- After the indicator check is ended, the diagnostic trouble code check begins automatically.
- Press the OFF switch when desiring to cancel the check mode.

Diagnostic Trouble Code Check (SENSOR CHECK)
1. Perform an indicator check. After the indicator check is completed, the system enters the diagnostic trouble code check mode automatically.





2. Read the code displayed on the panel. Refer to the list of codes when reading the codes. (Codes are output at the temperature display.)





If the slower display ped is desired, press the FRS switch and change it to stepped operation. Each time the FRS switch is pressed, the display changes by 1 step.

HINT:
- If the buzzer sounds when a code is being read, it means the trouble indicated by that code continues to occur.
- If the buzzer does not sound when a code is being read, it means the trouble indicated by that code occurred earlier (such as poor connector contacts, etc.)