HVAC Diagnostic Trouble Code Number Inspection
DIAGNOSTIC TROUBLE CODE NUMBER INSPECTION
1. Expose the solar radiation sensor to natural sunlight
NOTE:
- If natural sunlight is not shone on the solar radiation sensor, the climate control unit determines a malfunction and indicates DTC "02".
2. With the REC/FRESH switch and the A/C switch pressed at the same time, turn the ignition switch to the ACC position, and wait for 3 s, then turn the ignition switch to the ON position and wait for 3 s or more while continuing to press both switches.
3. Perform the DTC inspection (present and past malfunction indication modes). Read the DTCs on the information display. If the system is normal, "00" will be indicated on the display.
- If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection.
4. After completion of repairs, clear all DTCs from memory.
Present Malfunction Indication Mode
- The on-board diagnostic function displays the present malfunction indication mode directly after start up. In the present malfunction indication mode, present malfunctions in the control system circuits (open/short circuits) are detected, and the DTCs are indicated on the information display.
Past Malfunction Indication Mode
- While in the present malfunction indication mode, press the A/C switch to change to the past malfunction indication mode. In the past malfunction indication mode, past malfunctions (intermittent problems) in the input sensor circuits (open/short circuits) are stored and indicated on the information display. If the A/C switch is pressed again while in the past malfunction indication mode, the on-board diagnostic function will return to the present malfunction indication mode.
After Repair Procedure
- When DTCs are displayed in the past malfunction indication mode, they remain in the memory after the failed systems are corrected. Consequently, the next time the past malfunction indication mode is used, the same past malfunction DTCs will be indicated on the information display. Therefore, clear the past malfunction memory after correcting all failed systems. To clear the past malfunction memory, press the AUTO switch and the REC/FRESH switch at the same time while in the past malfunction indication mode. If cleared, "00" will be indicated on the information display.
DTC Table
A/C Operation Check Mode
Inspection procedure
1. Warm up the engine and turn the ignition switch to the LOCK position.
2. Start the present malfunction indication mode referring to the DTC inspection.
3. Turn the ignition switch to the ON position and press the AUTO switch.
4. Verify that all the indicator lights of the climate control unit and the information display illuminate for 4 s.
5. Verify the operation of each output device when changing steps by pressing the REC/FRESH switch, and referring to the output device operation check table.
- If any abnormality is found, inspect the malfunctioning system.
NOTE:
- If the AUTO switch is pressed during the A/C operation check mode, the on-board diagnostic function will return to the present malfunction indication mode.
6. Turn the ignition switch to the LOCK position to end the A/C operation check mode.
Operation check table
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Shown on the information display (at the set temperature display) according to the step.
A/C Cut-off Control Inspection
Without using M-MDS
1. Apply the parking brake securely and position wheel blocks against the front and rear tires.
2. Start the engine.
3. Turn the A/C switch and the fan switch on.
4. Verify that the magnetic clutch is engaged.
- If the magnetic clutch engagement is not verified, inspect the following, and repair or replace the malfunctioning part:
- A/C switch
- Fan switch
- Refrigerant pressure switch (high/low pressure)
- Wiring harnesses (open circuit) between the fan switch, A/C switch, refrigerant pressure switch (high/low pressure), and PCM terminal 1AU
- Refrigerant pressure switch (medium pressure)
- Wiring harness (open circuit) between the refrigerant pressure switch (medium pressure) and PCM terminal 1J
- Magnetic clutch
- A/C relay
- Wiring harnesses (open circuit) between the battery, A/C relay, magnetic clutch, and ground
- Wiring harness (open circuit) between the A/C relay and PCM terminal 1I
5. Fully depress the accelerator pedal (wide open throttle) and verify that the magnetic clutch is disengaged.
- If the magnetic clutch is not disengaged, inspect the following, and repair or replace the malfunctioning part:
- PCM terminals 1AO (No.1), 1AP (No.2) (accelerator position sensor input signal)
- PCM terminals 2AK (No.1), 2AL (No.2) (throttle position sensor input signal)
- A/C relay
- Wiring harnesses (open circuit) between the ignition switch, A/C relay, and PCM terminal 1I
Using M-MDS
1. Connect the M-MDS to the DLC-2.
2. Start the engine.
3. Monitor the "ACCS" referring to the PCM monitor inspection. PCM Inspection
4. Turn the A/C switch and the fan switch on.
5. Verify that the "ACCS" monitor displays "ON".
- If the "ACCS" monitor does not display "ON", inspect the following items:
- A/C switch
- Fan switch
- Refrigerant pressure switch (high/low pressure)
- Wiring harnesses (open circuit) between the fan switch, A/C switch, refrigerant pressure switch (high/low pressure), and PCM terminal 1AU
6. Monitor the "COLP".
7. Verify that the magnetic clutch engages when the "COLP" monitor displays "ON".
- If the magnetic clutch engagement is not verified, inspect the following items:
- Magnetic clutch
- A/C relay
- Wiring harnesses (open/short circuit) between the battery, A/C relay, magnetic clutch, and ground
- Wiring harness (open circuit) between the A/C relay and PCM terminal 1I
- If the "COLP" monitor does not display "ON", inspect the following items:
- Refrigerant pressure switch (medium pressure)
- Wiring harness (open circuit) between the refrigerant pressure switch (medium pressure) and PCM terminal 1J