A/C Cut-off Control System Inspection

1. Start the engine.
2. Turn the A/C switch on.
3. Verify that the A/C compressor magnetic clutch actuates.
   • If it does not actuate, perform the symptom troubleshooting "A/C DOES NOT WORK SUFFICIENTLY". (See A/C DOES NOT WORK SUFFICIENTLY [FULL-AUTO AIR CONDITIONER] .) (See A/C DOES NOT WORK SUFFICIENTLY [MANUAL AIR CONDITIONER] .)
4. Fully open the throttle valve and verify that the A/C compressor magnetic clutch does not actuate for 2-5s.
   • If it actuates, inspect the following:
     • A/C relay (See RELAY INSPECTION .)
     • Open or short to ground in wiring harness and connectors (IG1 relay-A/C relay-PCM terminal 2BB)
     • A/C related parts
     • APP1, APP2 PIDs (See PCM INSPECTION [VIN Y] .)

Cooling Fan Control System Inspection 

1. Connect the M-MDS to the DLC-2.
2. Start the engine and warm it up to normal operating temperature.
3. Perform the KOER self test. (See KOEO/KOER SELF TEST [PCM (VIN Y)] .)
4. Verify that DTC P0480:00 is not shown and the cooling fan operates during the KOER self test.
   • If the DTC P0480:00 is displayed, perform the DTC inspection. (See DTC P0480:00 [PCM (VIN Y)] .)
   • If the cooling fans do not operate, proceed to the following:
     • Inspect the following parts in the indicated order in accordance with fan operation conditions.
   • Open circuit between battery positive terminal and cooling fan relay
   • Open circuit between cooling fan relay and fan control module
   • Open circuit between fan control module and ground
   • Poor connection of the cooling fan relay
   • Poor connection of the fan control module connector
     • If there is no malfunction:
   • Replace the cooling fan component. (See COOLING FAN MOTOR REMOVAL/INSTALLATION [VIN Y] .)
5. Start the engine and idle it at an engine coolant temperature of less than 97 °C {207 °F}.
6. Verify that the cooling fan does not operate when the A/C switch is turned off.
   • If the cooling fan operates, perform an inspection of the following:
     • Cooling fan relay (stuck close)
     • Short to power supply in wiring harness between cooling fan relay and fan control module
     • Refrigerant pressure sensor
     • Climate control unit
     • CAN communication (PID: AC_REQ is on constantly)