Inspection Procedure 3
WHEN THE A/C IS OPERATING, TEMPERATURE INSIDE THE PASSENGER COMPARTMENT DOES NOT DECREASE (COOL AIR NOT EMITTED).DIAGNOSIS
STEP 1. Check for refrigerant leaks.
Q: Is the refrigerant leaking?
YES: Repair. Then go to Step 6.
NO: Go to Step 2.
STEP 2. 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 there is continuity between the respective terminals.
Q: When the high/low pressure sides of the dual pressure switch are at operation pressure (ON), is there continuity between the respective terminals?
YES: Go to Step 3.
NO: Replace the switch. Then go to Step 6.
STEP 3. Check the refrigerant-temperature switch operation.
Q: When the A/C is off, check that there is continuity between the refrigerant-temperature switch terminals. Is the circuit open loop?
YES: Replace the switch. Then go to Step 6.
NO: If less than two ohm, go to Step 4.
STEP 4. Measure the automatic compressor controller terminal voltage.
Q: Is the automatic compressor controller terminal voltage in good condition?
YES: Go to Step 5.
NO: Replace. Then go to Step 6.
STEP 5. Measure the engine control module
Refer to Computers/Testing/ECM/PCM Pinout Values/Check at The Engine Control Module (ECM)
Q: Is the voltage in good condition?
YES: Go to Step 6.
NO: Replace. Then go to Step 6.
STEP 6. Check symptoms.
Q: Is the cool air discharged?
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.