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TROUBLE SHOOTING

SELF-DIAGNOSTICS

An Electronic Control Unit (ECU) within A/C-heater control

panel monitors system circuits and stores trouble codes in memory if

problems are detected. All codes, except Codes 22 and 23, are stored

in memory. Malfunction is current if Code 22 or 23 is displayed. To

retrieve stored codes, see RETRIEVING CODES. Codes are displayed at

temperature display. See Fig. 2.

RETRIEVING CODES

1) Simultaneously press and hold AUTO and recirculated air

switches. See Fig. 2. Turn ignition on. All indicators will flash 4

times, at one-second intervals. Tone will sound when indicators flash.

2) A/C system will enter self-diagnostic mode. To end

indicator check, press and release OFF switch. Read codes at

temperature display.

3) If trouble code is displayed, proceed to appropriate

trouble shooting procedure. See DIAGNOSTIC CODE IDENTIFICATION table.

Codes are displayed in ascending order. To slow rate at which codes

are displayed, press fresh air button to change display to step

operation. Each time fresh air button is pressed, display changes by

one step.

4) If tone sounds as code is displayed, problem currently

exists. If tone does not sound as code is displayed, problem occurred

in past and does not presently exist.

Code Diagnosis

00 ................................................ Normal

11 (1) ............. In-Vehicle Temperature Sensor Circuit

12 (2) ................ Ambient Temperature Sensor Circuit

13 ................. Evaporator Temperature Sensor Circuit

14 .................... Coolant Temperature Sensor Circuit

21 (3) .............................. Solar Sensor Circuit

22 (4) .................... Compressor Lock Sensor Circuit

23 (4) ........................... Pressure Switch Circuit

31 .................. Air Mix Door Position Sensor Circuit

32 ................ Air Inlet Door Position Sensor Circuit

33 ............... Air Outlet Door Position Sensor Circuit

41 ....................... Air Mix Door Servomotor Circuit

42 ..................... Air Inlet Door Servomotor Circuit

43 .................... Air Outlet Door Servomotor Circuit

(1) - If in-vehicle temperature is -4 F (-20 C) or less,

Code 11 may set even though system is normal.

(2) - If outside air temperature is -58 F (-50 C) or less,

Code 12 may occur set though system is normal.

(3) - If testing is done in a dark area, Code 21 may set

even though system is normal. Shine a light at solar

sensor and recheck codes.

(4) - Malfunction is current. Code is not stored in memory.

ACTUATOR CHECK

1) Perform step 1) of RETRIEVING CODES. When system enters

self-diagnostic mode, press recirculated air button. Each mode door,

motor, and relay will operate at one-second intervals. Press fresh air

button to display codes one at a time, and perform step-by-step

actuator check.

2) Check airflow and temperature by hand. Tone will sound

each time display code changes. Each display code is associated with a

system operating condition. See Fig. 3 or 4. Press OFF button to

cancel actuator check mode.

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hello im new to the forum and ide like to say hi and thanks to this forum because it has been very helpfull!

anyways.

i have a 92 SC400 that i got for free from my uncle.. sadly to say it wasnt well maintaned so my borther and i did everything to make it work much better.

i just checked my AC thing and the numbers that came out were.. 11 21 23 41

41 had no beep.

what does this mean?

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How would I reset the A/C filter needs changing that flashes when starting engine? The A/C filter has been changed.

Thanks

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this is only for cars 95 and older, before OBD..

Before OBDII

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