RM36D0EC _51 Engine / Hybrid System _083048 HYBRID / BATTERY CONTROL _0709511 HYBRID CONTROL SYSTEM C

HYBRID / BATTERY CONTROL  HYBRID CONTROL SYSTEM  P31B300  Hybrid/EV Battery Voltage High  


DTC SUMMARY

MALFUNCTION DESCRIPTION


The hybrid vehicle control ECU assembly uses the inverter voltage to monitor the HV battery voltage and detect malfunctions.

The cause of this malfunction may be the following:

Inverter with converter assembly malfunction (Boost converter system)
·

VL sensor malfunction

·

VH sensor malfunction


HV battery system
·

Battery ECU assembly malfunction

·

HV battery malfunction



DESCRIPTION

The hybrid vehicle control ECU assembly uses the inverter voltage to monitor the HV battery voltage and detect malfunctions.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate Note
P31B300 Hybrid/EV Battery Voltage High The inverter voltage exceeds the threshold.
(1 trip detection logic)
·

Inverter with converter assembly

·

Battery ECU assembly

·

No. 1 HV supply stack sub-assembly

·

No. 2 HV supply stack sub-assembly


Comes on Master Warning:
Comes on 		SAE Code:
P31B3

CONFIRMATION DRIVING PATTERN

HINT:
·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>UTILITY

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>DTC CHECK / CLEAR



1.

Connect the GTS to the DLC3.

2.

Turn the power switch on (IG) and turn the GTS on.

3.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4.

Turn the power switch off and wait for 2 minutes or more.

5.

Turn the power switch on (IG) and turn the GTS on.

6.

Turn the power switch on (READY) and wait for 30 seconds or more. [*1]

HINT:

[*1] : Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.


7.

Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

8.

Check the DTC judgment result.

HINT:
·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.




CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>PRECAUTION


PROCEDURE

1.CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR)
a.

Connect the GTS to the DLC3.


b.

Turn the power switch on (IG).


c.

Enter the following menus: Powertrain / Hybrid Control and Motor Generator / Trouble Codes.


d.

Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes
50001 397
Powertrain > Motor Generator > Trouble Codes
50001 395
Result:
Result Proceed to
P31B300 only is output, or DTCs except the ones in the table below are also output. A
DTCs of hybrid control system in the tables below are output. B
DTCs of motor generator control system in the tables below are output. C


Malfunction Content System Relevant DTC
Sensor and actuator circuit malfunction Hybrid control system P0D2D1C Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range
P0E311C Boosting Converter Voltage Sensor "A" Voltage Out of Range
P1C2D62 Hybrid/EV Battery "A" Voltage Sensor/Boosting Converter Voltage Sensor "A" Signal Compare Failure
Motor generator control system P0D2D16 Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Below Threshold
P0D2D17 Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Above Threshold
P0D2D1F Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Intermittent
P0E3116 DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Below Threshold
P0E3117 DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Above Threshold
P0E311F DC/DC Converter Voltage Sensor "A"(VL) Circuit Intermittent
P0E5717 DC/DC Converter Voltage Sensor "A"(VL) Circuit Voltage Above Threshold

HINT:
·

P31B300 may be output as a result of the malfunction indicated by the DTCs above.

(a)

The chart above is listed in inspection order of priority.

(b)

Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)





e.

Turn the power switch off.



A

2.READ VALUE USING GTS (HYBRID/EV BATTERY VOLTAGE)

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>DIAGNOSTIC TROUBLE CODE CHART


C

GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM)

for 2WD:

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>MOTOR GENERATOR CONTROL SYSTEM (for 2WD with LITHIUM-ION BATTERY [Production date from 2021/08])>DIAGNOSTIC TROUBLE CODE CHART

for AWD:

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>MOTOR GENERATOR CONTROL SYSTEM (for AWD with LITHIUM-ION BATTERY)>DIAGNOSTIC TROUBLE CODE CHART


2.READ VALUE USING GTS (HYBRID/EV BATTERY VOLTAGE)
a.

Connect the GTS to the DLC3.


b.

Turn the power switch on (IG).


c.

Enter the following menus: Powertrain / HV battery / Data List / Hybrid/EV Battery Voltage


d.

Read the Data List.

Powertrain > HV Battery > Data List
Tester Display
Hybrid/EV Battery Voltage
50003 398 288
NOTICE:

Be sure not to measure when the power switch is on (READY).



e.

Make a note of the data list item "Hybrid/EV Battery Voltage".


f.

Turn the power switch off.


Result:
Proceed to
NEXT



NEXT

3.CHECK HV BATTERY
3.CHECK HV BATTERY
CAUTION:

Be sure to wear insulated gloves.


a.

Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.



b.

Remove the electric vehicle battery plug assembly.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>BATTERY PLUG (for LITHIUM-ION BATTERY [Production date from 2021/08])>REMOVAL


c.
C529591N01
2.052,0.583 2.427,0.833 0.375,0.25 1.458,1.604 1.833,1.875 0.375,0.271 2.104,0.604 2.417,0.802 0.313,0.198 10 true z30 1.51,1.646 1.813,1.844 0.302,0.198 10 true z21

Disconnect the z30 and z21 HV battery high voltage connectors.

NOTICE:

Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.



d.
A572941C01
0.479,1.135 0.854,1.396 0.375,0.26 0.042,3.24 0.417,3.5 0.375,0.26 0.573,1.177 0.885,1.375 0.313,0.198 10 false z30 0.125,3.292 0.438,3.49 0.313,0.198 10 false z21 0.417,0.313 0.729,0.469 0.313,0.156 10 false *a 0.313,2.448 0.625,2.604 0.313,0.156 10 false *b
*a No. 2 HV Supply Stack Sub-assembly Connector
(Hybrid Battery Terminal Block Side)
*b No. 1 HV Supply Stack Sub-assembly Connector
(HV Battery Junction Block Assembly Side)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition
z30-1 - z21-1 Power switch off


CAUTION:

Do not allow the probes of the electrical tester to contact each other during this inspection.



e.

Check the value in the data list "Hybrid/EV Battery Voltage" and the hybrid battery voltage value that was actually measured.

Result:
Result Proceed to
When the difference between "Hybrid/EV Battery Voltage" in the Data List and the measurement value of the HV battery voltage is 5 V or more. A
Other than above B



f.

Reconnect the z30 and z21 HV battery high voltage connectors.


g.

Install the electric vehicle battery plug assembly.



A

4.REPLACE BATTERY ECU ASSEMBLY

B

5.CHECK FREEZE FRAME DATA (HYBRID CONTROL)
5.CHECK FREEZE FRAME DATA (HYBRID CONTROL)
a.

Connect the GTS to the DLC3.


b.

Turn the power switch on (IG).


c.

Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.


d.

Read the freeze frame data of DTC P31B300.

Powertrain > Hybrid Control > Trouble Codes
50001 397
Result:
Result Proceed to
"Hybrid/EV Battery Voltage" is less than 292 V. A
Other than above B



e.

Turn the power switch off.



A

REPLACE INVERTER WITH CONVERTER ASSEMBLY

for 2WD:

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>INVERTER WITH CONVERTER (for 2WD)>REMOVAL

for AWD:

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>INVERTER WITH CONVERTER (for AWD)>REMOVAL


B

6.REPLACE BATTERY ECU ASSEMBLY