HIGH VOLTAGE BATTERY DOES NOT COOL

id300300000900

Warning
<<High voltage>>
•  If the necessary measures are not taken before servicing an electric vehicle, it could cause electrical shock and result in serious injury or, in the worst case, death. Before servicing the electric vehicle, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and implement the necessary measures. (See HIGH VOLTAGE SERVICE CAUTIONS.)

Outline

Malfunction symptom

High voltage battery does not cool
Description
•  It takes a long time to fully charge with quick charge.
•  Frequency of poor acceleration or insufficient power is high.
Possible cause
High voltage battery cooling system operation malfunction:
•  Refrigerant leakage
•  Electric compressor malfunction
•  Electric expansion valve (in high voltage battery) malfunction
•  2way valve for refrigerant malfunction
•  3way valve for refrigerant malfunction
•  Refrigerant passage blockage
•  Condenser fin blockage/separation
•  Cooling fan malfunction
•  Ambient temperature sensor malfunction
•  Refrigerant pressure sensor No.2 malfunction
•  Temperature sensor of refrigerant line for evaporator outlet malfunction
•  Temperature sensor of air for PTC/temperature sensor of refrigerant line for electric compressor outlet malfunction
•  Temperature sensor of refrigerant line for condenser outlet malfunction
•  Temperature sensor of refrigerant line for the high voltage battery malfunction
•  Poor contact of cooling plate with battery module
High voltage battery malfunction:
•  Battery cell malfunction (deterioration)
•  High voltage battery module temperature sensor malfunction
System wiring diagram
•  Not applicable
Connector diagram
•  Not applicable


Diagnostic Procedure

Warning
<<High voltage>>
•  If necessary measures such as wearing the correct protective gear are not taken when inspecting or removing/installing the high voltage parts, it could cause electrical shock and result in serious injury or, in the worst case, death.
•  Before inspecting or removing/installing the high voltage parts, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and [High Voltage Part Inspection and Removal/Installation Notes] of the high voltage system service cautions and implement the necessary measures and preparations. (See HIGH VOLTAGE SERVICE CAUTIONS.) (See HIGH VOLTAGE SYSTEM SERVICE CAUTIONS.)

Step

Inspection

Results

Action
1
VERIFY HIGH VOLTAGE BATTERY COOLING RELATED DTCs
•  Perform the DTC inspections for the following modules.
―  PCM
―  BECM
―  Heat pump control unit
•  Is a DTC displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (e-SKYACTIV)].)
(See DTC TABLE [BECM (e-SKYACTIV)].)
(See DTC TABLE [HEAT PUMP CONTROL UNIT].)
No
Go to the next step.
2
INSPECT REFRIGERANT PRESSURE
•  Inspect the refrigerant pressure.
•  Is the refrigerant pressure normal?
Yes
Go to the next step.
No
Inspect the refrigerant system following the symptom troubleshooting procedure.
(See AIR FROM VENTS NOT COLD ENOUGH [FULL-AUTO AIR CONDITIONER].)
3
VERIFY COOLING PERFORMANCE OF HIGH VOLTAGE BATTERY COOLING SYSTEM
•  Connect the M-MDS to the DLC-2.
•  Display BECM PID [HV_BATT_OUT_REFR_TEMP] using the M-MDS.
•  Record the PID [HV_BATT_OUT_REFR_TEMP] value.
Note
•  Do not operate the after cooling function of the high voltage battery before performing the diagnostic.
•  Leave the vehicle for 1 h or more before performing the forced operation of the high voltage battery cooling system.
•  This function operates at an ambient temperature 5 °C {41 °F} or more.
•  This function operates for a maximum of 30 min.
•  If this function stops mid-way due to causes other than the ambient temperature, go to the next step.
•  Select the following menu and perform [Cooling for drive battery] for [Compulsory operating Air Conditioner] for 10 min.
1.  Press [Start] to start the vehicle identification.
2.  Press the [Toolbox] tab.
3.  Press the [Work Support] icon.
4.  Press [EV].
5.  Press [Run] for Compulsory operating Air Conditioner.
6.  Select the Cooling for drive battery.
•  Verify the BECM PID [HV_BATT_OUT_REFR_TEMP] value.
•  Is the monitor value 5 °C {41 °F} or more lower than before the climate control system forced operation?
Yes
Complete the symptom troubleshooting.
Return to the diagnostic procedure of other symptom troubleshooting.
No
Go to the next step.
4
VERIFY IF HIGH VOLTAGE BATTERY TEMPERATURE IS AT TEMPERATURE WHERE OPERATION VERIFICATION OF ELECTRIC EXPANSION VALVE (IN HIGH VOLTAGE BATTERY) IS POSSIBLE
Note
•  A high voltage battery temperature of less than 5 °C {41 °F}is necessary for the [Expansion valve for battery cooling] diagnosis in Step 5.
•  Connect the M-MDS to the DLC-2.
•  Display BECM PID [HV_BATT_TEMP_MAX] using the M-MDS.
•  Verify the BECM PID [HV_BATT_TEMP_MAX] value.
•  Is the monitor value 40 °C {104 °F} or more?
Yes
Refer to Step 3 and perform the [Cooling for drive battery] in the [Compulsory operating Air Conditioner] for 5 min until the PID [HV_BATT_TEMP_MAX] value is less than 5 °C {41 °F}.
No
Go to the next step.
5
VERIFY ELECTRIC EXPANSION VALVE (IN HIGH VOLTAGE BATTERY) OPERATION
•  Connect the M-MDS to the DLC-2.
Note
•  This function operates at an ambient temperature 15 — 40 °C {59 — 104 °F}.
•  Select the following menu and perform the [Expansion valve for cooling battery] for [Self-Diagnosis Air Conditioner control valves].
•  Select the following menu and perform the air conditioner control valve on-board diagnosis.
1.  Press [Start] to start the vehicle identification.
2.  Press the [Toolbox] tab.
3.  Press the [Work Support] icon.
4.  Press [EV].
5.  Press [Run] for Self-Diagnosing Air Conditioner control valves.
6.  Select the Expansion valve for cooling battery.
•  Is the troubleshooting result normal?
Yes
Perform the climate control system refrigerant system performance test.
(See REFRIGERANT SYSTEM PERFORMANCE TEST.)
No
Replace the high voltage battery.
(See HIGH VOLTAGE BATTERY REMOVAL/INSTALLATION.)