Diagnosis System (A/C Auto AMP.)
DIAGNOSIS SYSTEM (A/C AUTO AMP.)
Diagnosis Description
ON BOARD SELF-DIAGNOSIS SYSTEM
On board self-diagnosis system is built into A/C auto amp. to quickly locate the case of malfunctions. The self-diagnosis system diagnosis sensor, door motor, blower motor, etc. and also can make the setting of auxiliary mechanism.
SELF-DIAGNOSIS PROCEDURE
Self-diagnosis Mode Entry
The self-diagnosis is started by pressing the OFF switch at 5 seconds or more within 10 seconds after starting engine.
NOTE:
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. Start engine before performing this diagnosis to avoid this.
Changes of Step up and Step down
- The changes of STEP 1 - 5 can be performed by pressing the temperature control switch.
- The change of STEP 6 - 7 can be performed by pressing the fan control switch during the condition of
STEP-5.
Self-diagnosis Cancellation
By AUTO switch is pressed or ignition switch is turned OFF, the self-diagnosis is canceled.
STEP-1: INDICATOR CHECK
Description
A/C switch indicator and A/C display indication are checked.
Normal: All switch indicator and display indication are turned ON.
Malfunction: Malfunctioning part indicator is not turned ON.
STEP-2: SENSOR DIAGNOSIS
Description
When STEP-2 is selected, "2" is indicated on the display for 3 seconds, in this period, sensor diagnosis is started.
Normal: "20" is displayed.
Malfunction: The ones place digit of corresponding code number blinks 2 times on the A/C display. When short-circuit error, "AUTO" blinks on the display.
NOTE:
If two or more sensors, or door motor malfunction, the ones place digit of corresponding code numbers blink respectively twice.
Diagnosis Result
NOTE:
- When ambient sensor has the malfunction of open-circuit, the sensor judges that ambient temperature is extremely cold, and controls the in vehicle temperature to warmly.
- When performing the diagnosis of intake door motor, the target angle of PBR is set at 40%.
- The error judgment status of intake door motor is not decided by open or short circuit, it is decided by the voltage value as follows:
- Short: 2.5 V or more
- Open: 1.5 V or less
STEP-3: DOOR MOTOR DIAGNOSIS
Description
When STEP-3 is selected, "3" is indicated on the display for 1 second, in this period, door motor diagnosis is started.
The check of door motor is performed by A/C auto amp. transmitting output signal to each door motor.
Normal: "30" is displayed.
Malfunction: The ones place digit of corresponding code number blinks 2 times on the A/C display. When short-circuit error, "AUTO" blinks on the display.
NOTE:
If two or more door motor connectors malfunction, the ones place digit of corresponding code numbers blink respectively twice.
NOTE:
When the malfunctioning condition as following figure, "31" is displayed.
Diagnosis Result
NOTE:
- If all four terminals of each door motor show an open circuit, there is probably a disconnected connector or an open circuit in door motor drive power supply harness.
- If a short circuit occurs in harness between terminals for each door motor drive signal, although it cannot be detected by self-diagnosis, door motor will vibrate when it operates.
Door Motor Starting Position Reset
- Pressing DEF switch during STEP-3 will send a reset signal to air mix door and mode door motor to reset them to starting position.
- During reset operation, DEF switch indicator and "30" blink for approximately 9 seconds.
STEP-4: OPERATION CHECK
Description
When STEP-4 is selected, each part operation is started with indicating "4" on the display.
Each time DEF switch is pressed, the display will change to 41 to 42 to 43 to 44 to 45 to 46 to 41.
Operation Contents
Checks must be visually, by listening the sound or by touching air outlets with hand, etc. for improper operation.
STEP-5: EACH SENSOR RECOGNITION CHECK
Description
When STEP-5 is selected, "5" is indicated on the display.
Each time DEF switch is pressed, each sensor recognition temperature is changed in order of the following:
5 to Ambient temperature to In-vehicle temperature to Intake temperature to 5.
NOTE:
Each sensor recognition temperature is not displayed in less than -30�C (-22�F) or more than 55�C (131�F).
STEP-6: TEMPERATURE SETTING TRIMMER
Description
The trimmer compensates for differences in range of ±3�C (±6�F) between temperature setting (displayed digitally) and temperature felt by customer.
Setting Procedure
Temperature Setting Trimmer.
STEP-7: INLET PORT MEMORY FUNCTION
Description
- Inlet port setting can be memorized when ignition switch is turned OFF.
- Inlet port setting can be selected from FRE (fresh air intake), REC (recirculation), or "Do not perform the memory" when ignition switch is turned ON.
Setting Procedure
Inlet Port Memory Function.