Reading and Clearing Diagnostic Trouble Codes

DESCRIPTION
The self-diagnostic system diagnosis sensors, door motors, blower motor, etc. by system line. Refer to applicable sections (items) for details. Shifting from normal control to the self-diagnostic system is accomplished by starting the engine (turning the ignition switch from "OFF" to "ON") and pressing "OFF" switch for at least 5 seconds. The "OFF" switch must be pressed within 10 seconds after starting the engine (ignition switch is turned "ON"). This system will be canceled by either pressing "AUTO" (AUTO) switch or turning the ignition switch "OFF". Shifting from one step to another is accomplished by means of turning TEMP dial right or left, as required.




Perform all of the following tests to narrow the problem to a specific assembly, actuator, or function. Link to the Diagnostic Procedure which corresponds to malfunctions noted in these tests.

If the A/C display screen has no display, check all power supply circuits to the A/C Auto Amp.

Step 1 - 3:

Step 4 - 7:

Step 8:

Step 9 - 12:

Step 13:

Step 14:

FUNCTION CONFIRMATION PROCEDURE

AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER




Unconfirmed Incidents
The customer may feel that the cabin temperature is not being controlled or regulated to the temperature indicated by the auto A/C display screen. To satisfy individual driver preference the Temperature Setting Trimmer may be used to compensate in a range of ±3�C (±6�F).

1. Enter Self Diagnosis mode and select STEP 5.
2. Press the Fan Up switch: This will set the A/C system in auxiliary mode and the display will show 61.
3. Turn the temperature dial clockwise or counterclockwise: The temperature will change at a rate of 0.5�C (1�F).

If power is lost to the A/C Auto Amp., trimmer setting is canceled and setting becomes that of initial condition, 0�.

When battery cable is disconnected, trimmer operation is canceled. Temperature set becomes that of initial condition, i.e. 0�C (0�F).