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While the engine is running, with the blower switch ON, and when the temperature control
dial is set to MAX COOL, if cool air does not come out from the vents, A/C compressor control
circuit system may be defective.
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- Malfunction of the A/C evaporator air outlet thermistor
- Malfunction of the dual pressure switch
- Malfunction of the engine-ECU
- Damaged the wiring harness or connectors
- Improper amount of refrigerant
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Q.
Is the check result normal?
 Go to Step 2.
 Repair the connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position.
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(3)Disconnect engine-ECU connector C-105 and earth terminal 40.
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(4)Voltage between terminal 1 and body earth.
OK: System voltage
Q.
Is the check result normal?
Go to Step 3.
Refer to Inspection Procedure 4 " The A/C compressor and clutch assembly
does not work  ".
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(1)Turn the ignition switch to the "ON" position.
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(2)Turn the blower switch to the "4 (HI) " position.
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Q.
Does the blower motor operate when the blower switch is moved to the "4 (HI)" position?
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Refer to Inspection procedure 2 "The blower does not work ."
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between terminal 5 and body earth.
OK: Continuity (Less than 2Ω)
Q.
Is the check result normal?
Go to Step 6.
Go to Step 5.
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- Check the A/C switch module earth line for open circuit.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring harness.
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(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal 10 and body earth.
OK: System voltage
Q.
Is the check result normal?
Go to Step 8.
Go to Step 7.
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| note |
Prior to the wiring harness inspection, check junction block connector C-209 and C-207,
and repair if necessary.
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- Check the blower relay power supply line for open circuit.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring harness.
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Q.
Is the check result normal?
Go to Step 9.
Repair the connector.
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- Check the blower switch signal line and earth line for open or short circuit.
Q.
Is the check result normal?
Go to Step 10.
Repair the wiring harness.
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Q.
Is the check result normal?
Go to Step 11.
Repair the connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between terminal 1 and body earth.
OK: Continuity (Less than 2Ω)
Q.
Is the check result normal?
Go to Step 13.
Go to Step 12.
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- Check the A/C switch module earth line for open circuit.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring harness.
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- Check the input line for open or short circuit.
Q.
Is the check result normal?
Go to Step 14.
Repair the wiring harness.
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Q.
Is the check result normal?
Go to Step 15.
Repair the connector.
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Q.
Is the check result normal?
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Replace the A/C receiver assembly.
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| note |
Prior to the wiring harness inspection, check intermediate connector C-54 <LHD> or
C-14 <RHD>, and repair if necessary.
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- Check the dual pressure switch signal line.
Q.
Is the check result normal?
Go to Step 17.
Repair the wiring harness.
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| note |
Prior to the wiring harness inspection, check intermediate connector A-28, and repair
if necessary.
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- Check the dual pressure switch signal line.
Q.
Is the check result normal?
Go to Step 18.
Repair the wiring harness.
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Q.
Can the sound of the A/C compressor clutch (click) be heard?
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Replace the A/C compressor clutch.
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Check that the refrigerant level is adequate. Refer to .
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Q.
Is the check result normal?
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Charge or remove the refrigerant level. Refer to .
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Check that the cooler works normally.
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Q.
Is the check result normal?
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This diagnosis is complete.
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Check that the cooler works normally.
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Q.
Is the check result normal?
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This diagnosis is complete.
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