Without Scan Tool

NOTE: This is the only information provided by the manufacturer for reading diagnostic trouble codes for this system.

PRE-CHECK




1. WARNING FOR A/C COMPRESSOR LOCK
If compressor lock occurs during A/C operation, the A/C switch indicator on the A/C control assembly starts blinking to warn the driver.
When this occurs, check for compressor lock (DTC B1422/22) using DTC check then proceed to inspect the circuit or the component.




2. LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown the diagram, it is possible to enter the diagnosis check mode.




3. INDICATOR CHECK
a. Turn the ignition switch ON while pressing the A/C control AUTO switch and R/F switch simultaneously.




b. Check that the indicators light up and go off at second intervals 4 times in succession.

HINT:
- After the indicator check is completed, the system enters the DTC begins automatically.
- Press the OFF switch when desiring to cancel the check mode.




4. DTC CHECK (SENSOR CHECK)
a. Perform an indicator check. After the indicator check is completed, the system enters the DTC check mode automatically.
b. Read the code displayed on the panel. Refer to the list of codes when reading the codes. (Trouble code are output at the temperature display.)




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




5. DTC CHECK USING HAND-HELD TESTER
a. Hook up the hand-held tester to the DLC3.
b. Read the diagnostic trouble codes by following the prompts on the tester screen.




6. CLEARING DTC
a. Pull out the ECU-B fuse in engine room J/B for 10 Sec. or longer to clear the DTC memory.
b. After reinserting the fuse, check that the normal code is output.







7. ACTUATOR CHECK
a. After entering the DTC check mode (Sensor Check Mode) press the R/F switch.
b. Since each damper, motor and relay automatically operates at 1 sec. intervals beginning in order from 10 in the temperature display, check the temperature and air flow visually and by hand.
It the slower display is desired, press the DEF switch and change it to step operation. Each time the DEF switch is pressed, the display changes by 1 step.

HINT:
- Code are displayed in order from the smaller to the larger numbers.
- To cancel the check mode, press the OFF switch.