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DTC P0531: Refrigerant PRS. sensor range
 
 
cautionWhenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • The electric compressor doesn't operate when the refrigerant pressure is less then 0.19 MPa (28 psi) or more than 2.8 MPa (406 psi).
  • The electric compressor doesn't work when the refrigerant temperature is less than 0°C (32°F) according to correlation between the refrigerant pressure and refrigerant temperature so the monitor is not preformed under the condition.
  • The monitor uses the driving battery temperature minimum value and engine intake air temperature instead of the refrigerant temperature to enable diagnostics.
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Battery cooling evaporator temperature sensor
  • Driving battery temperature sensor
  • Intake air temperature sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • The heater controller assembly (A/C-ECU) power supply voltage is between 10 and 16 volts.
  • The battery cooling evaporator temperature is more than 4°C (39°F).
  • The drive battery temperature minimum value is more than 15°C (59°F).
  • The intake air temperature is more than 0°C (32°F).
Judgment Criterion
  • Change the A/C pressure sensor pressure is more than 2.8 MPa (406 psi) (4.253 volts) for 300 seconds.
Judgment Criterion
  • Change the A/C pressure sensor pressure is less than 0.19 MPa (28 psi) (0.382 volt) for 300 seconds.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
PROBABLE CAUSES
  • Malfunction of the CAN bus
  • Malfunction of the heater controller assembly (A/C-ECU)
  • Malfunction of the PHEV-ECU.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Scan tool (M.U.T.-IIISE) other system DTC [heater controller assembly (A/C-ECU)] (Refer to ).
Is the DTC set?
Troubleshoot for the relevant DTC. Then go to Step 3.
Go to Step 2.
 
STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to GROUP 54Da - PHEV-ECU ). Then go to Step 3.
The procedure is complete.
 
STEP 3 Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.