INSPECTION
PROCEDURE 1: Cool air does not come <Front side>
|
|
If cool air does not exit from the air outlets when the blower switch is on with the engine
running, the A/C compressor and the dual pressure switch circuits may be defective.
|
|
|
- The refrigerant quantity is inadequate.
- Damaged harness wires and connectors
- Malfunction of the blower relay
- Malfunction of the blower
- Malfunction of the temperature controller <Cooler>
- Malfunction of the fin thermo sensor
- Malfunction of the A/C switch <Manual A/C>
- Malfunction of the A/C fan control resistor
- Malfunction of the engine-ECU
- Malfunction of the dual pressure switch
- Malfunction of the A/C compressor relay
- Malfunction of the A/C compressor and clutch
- Malfunction of the heater controller assembly
|
|
|
STEP 1. Check the M.U.T.-III diagnosis code for engine-ECU.
|
|
|
Check whether the engine-ECU sets any of the diagnosis codes below:
|
|
|
P0537: Fin thermo sensor circuit low input
P0538: Fin thermo sensor circuit high input
|
|
|
Q.
Is the diagnosis code set?
|
|
|
YES <4D5> : Carry out the diagnosis code procedures (Refer to GROUP 13E - Code No.
P0537: Fin thermo sensor circuit low input, Code No. P0538: Fin thermo sensor circuit high Input).
|
|
|
|
|
|
YES <4N1> : Carry out the diagnosis code procedures (Refer to GROUP 13C - Code No.
P0537: Fin thermo sensor circuit low input, Code No. P0538: Fin thermo sensor circuit high Input).
|
|
|
|
|
|
NO <Manual A/C> : Go to Step 2.
|
|
|
|
|
|
NO <Except manual A/C> : Go to Step 3.
|
|
|
|
|
|
STEP 2. Check the A/C switch.
|
|
|
Refer to  .
|
|
|
Q.
Is the A/C switch in good condition?
|
|
|
 Go to Step 3.
|
|
|
|
|
|
 Replace the heater controller assembly (Refer to ).
|
|
|
|
|
|
STEP 3. Check the blower operation.
|
|
|
Check that air blows through the air outlets.
|
|
|
(1)Turn the ignition switch to the ON position.
|
|
|
(2)Air volume adjusting knob: Other than OFF
|
|
|
(3)Check that the air comes out of the blower.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 4.
|
|
|
|
|
|
Refer to Inspection Procedure 3 "The blower does not work <Front side>".
|
|
|
|
|
|
STEP 4. Check the A/C compressor operation.
|
|
|
Check that the compressor operates under the following conditions.
|
|
|
- Engine operation
- Air volume adjusting knob: Maximum air volume
- Temperature adjusting knob: MAX COOL
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Refer to Inspection Procedure 7 "The A/C compressor and clutch assembly
does not work".
|
|
|
|
|
|
STEP 5. Refrigerant level check.
|
|
|
Check that the refrigerant level is adequate.
|
|
|
Q.
Is the check result normal?
|
|
|
YES : Go to Step 6.
|
|
|
|
|
|
Adjust the refrigerant level.
|
|
|
|
|
|
STEP 6. Check the dual pressure switch.
|
|
|
Refer to dual pressure switch check.
|
|
|
Q.
Is the dual pressure switch in good condition?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Replace the dual pressure switch.
|
|
|
|
|
|
STEP 7. Voltage measurement at dual pressure switch connector.
|
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Voltage between terminal 1 and body earth.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 9.
|
|
|
|
|
|
Go to Step 8.
|
|
|
|
|
|
STEP 8. Check of open circuit in dual pressure switch line between
dual pressure switch connector AC/S terminal and engine-ECU connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction).
|
|
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 9. Voltage measurement at heater control panel.
|
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Voltage between terminal 9 and body earth.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 11.
|
|
|
|
|
|
Go to Step 10.
|
|
|
|
|
|
STEP 10. Check of open circuit in dual pressure switch line heater
control panel connector and dual pressure switch connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction).
|
|
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 11. Retest the system
|
|
|
Q.
Is the check result normal?
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction).
|
|
|
|
|
|
NO <4D5> : Replace the engine-ECU (Refer to GROUP 13E - Engine-ECU). Then go to
Step 12.
|
|
|
|
|
|
NO <4N1> : Replace the engine-ECU (Refer to GROUP 13C - Engine-ECU). Then go to
Step 12.
|
|
|
|
|
|
STEP 12. Retest the system
|
|
|
Q.
Is the check result normal?
|
|
|
This diagnosis is complete.
|
|
|
|
|
|
Replace the heater controller assembly.
|
|
|
|