1. When The Ignition Switch Is "ON", The A/C Does Not Operate
DIAGNOSISSTEP 1. Check for refrigerant leaks.
If leaking, repair the leak. Then go to Step 11.
If normal, go to Step 2.
STEP 2. Check for excessive refrigerant.
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.
If the A/C does not operate, go to Step 3.
STEP 3. Check the A/C compressor relay continuity.
If incorrect, replace. Then go to Step 11.
If correct, go to Step 4.
STEP 4. Check the magnetic clutch operation.
Connect the battery (+) terminal to the compressor magnetic clutch connector terminal 1; <2.4L engine>/terminal 3; <3.0L engine>, and ground the battery (-) terminal to the body of the compressor. The condition is normal if the sound of the magnetic clutch (click) can be heard.
If faulty, replace. Then go to step 11.
If normal, go to Step 5.
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. (Refer to Performance Test.) Performance Test
3. When the high/low pressure sides of the dual pressure switch are at operation pressure (ON) and the resistance is less than two Ohms between the respective terminals, then the condition is normal. If open loop, replace the switch.
Then go to Step 11.
If correct, go to Step 6.
STEP 6. Check the A/C switch continuity.
If incorrect, replace. Then go to Step 11.
If correct, go to Step 7.
STEP 7. Check the blower switch continuity.
If incorrect, replace. Then go to Step 11.
If correct, go to Step 8.
STEP 8. Check the refrigerant-temperature switch operation.
When the A/C is off, check that there is less than 2 Ohms. between the refrigerant-temperature switch terminals. If the switch has an open circuit, replace the switch. Then go to Step 11.
If normal, go to Step 9.
STEP 9. Measure the automatic compressor controller terminal voltage.
If incorrect, replace. Then go to Step 11.
If normal, go to Step 10.
STEP 10. Measure the engine control module
Refer to Diagnosis (Computers/Testing) - Check at The Engine Control Module (ECM)
Refer to Diagnosis (Computers/Testing) - Check at The Engine Control Module (ECM)
If incorrect, replace. Then go to Step 11.
STEP 11. Check symptoms.
Check that the A/C operates.