Inspection Procedure 1
When the Ignition Switch is "ON," the A/C does not Operate.DIAGNOSIS
STEP 1. Check for refrigerant leaks.
Q: Is the refrigerant leaking?
YES: Repair the leak. Then go to Step 11.
NO: Go to Step 2.
STEP 2. Check for excessive refrigerant.
Q: Is the refrigerant in good condition?
YES: Go to Step 3.
NO: Use the refrigerant recovery station to remove all of the refrigerant, and then calculate the amount of the refrigerant and charge it. Then go to Step 11.
STEP 3. Check the A/C compressor relay continuity.
Q: Is the A/C compressor relay in good condition?
YES: Go to Step 4.
NO: Replace. Then go to Step 11.
STEP 4. Check the magnetic clutch operation.
Connect the battery (+) terminal to the compressor magnetic clutch connector terminal 1; <2.4L engine>/terminal 4; <3.0L engine>, and ground the battery (-) terminal to the body of the compressor.
Q: Can the sound of the magnetic clutch (click) be heard?
YES: Go to Step 5.
NO: Replace. Then go to Step 11.
STEP 5. Check the dual pressure switch operation.
1 Remove the dual pressure switch connector and connect the high/low pressure side terminals located on the harness side as shown in the illustration.
2 Install a gauge manifold to the high-pressure side service valve of the refrigerant line.
3. When the high/low pressure sides of the dual pressure switch are at operation pressure (ON) and the resistance is Less than 2 ohm between the respective terminals, then the condition is normal. If open loop, replace the switch.
Q: Is the dual pressure switch operating properly?
YES: Go to Step 6.
NO: Replace the switch. Then go to Step 11.
STEP 6. Check the A/C switch continuity.
Q: Is the A/C switch continuity in good condition?
YES: Go to Step 7.
NO: Replace. Then go to Step 11.
STEP 7. Check the blower switch continuity.
Q: Is the blower switch continuity in good condition?
YES: Go to Step 8.
NO: Replace. Then go to Step 11.
STEP 8. Check the refrigerant-temperature switch operation.
When the A/C is off, check that there is Less than 2 ohm between the refrigerant-temperature switch terminals.
Q: Is the refrigerant-temperature switch in good condition?
YES: Go to Step 9.
NO: If the switch has an open circuit, replace the switch. Then go to Step 11.
STEP 9. Measure the automatic compressor controller terminal voltage.
Q: Is the automatic compressor controller terminal voltage good?
YES: Go to Step 10.
NO: Replace. Then go to Step 11.
STEP 10. Measure the engine control module
Refer to Diagnosis - Check at The Engine Control Module (ECM)
Refer to Diagnosis - Check at The Engine Control Module (ECM)
Q: Is the terminal voltage in good condition?
YES: Go to Step 11.
NO: Replace. Then go to Step 11.
STEP 11. Check symptoms.
Q: Is the A/C operating properly?
YES: This diagnosis is complete. (If no malfunctions are not found in all steps, an intermittent malfunction is suspected. Refer to Introduction, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction)
NO: Go to Step 1.