RM38T0EC _51 Engine / Hybrid System _144957 HYBRID / BATTERY CONTROL _0604232 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 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 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

·

HV battery


Comes on Master Warning Light:
Comes on 		SAE Code:
P31B3

MONITOR DESCRIPTION

The hybrid vehicle control ECU monitors the cell overcharge signal. If the hybrid vehicle control ECU detects an abnormality in the sensor signal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY

Related DTCs P31B3 (INF P31B300): Hybrid/EV Battery Voltage high
Required sensors/components Battery ECU assembly
Frequency of operation Continuous
Duration TMC's intellectual property
MIL operation 1 driving cycle
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored TMC's intellectual property
Other conditions belong to TMC's intellectual property -

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property -

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU P31B3 (INF P31B300) is not detected

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 ignition switch to ON and turn the GTS on.

3.

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

4.

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

5.

Turn the ignition switch to ON and turn the GTS on.

6.

Turn the ignition switch to 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


NOTICE:
·

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>BEFORE DISCONNECTING BATTERY

·

When disconnecting and reconnecting the auxiliary battery

HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>AUTOMATIC LEARNING CHART




HINT:
·

P31B300 may be output as a result of the malfunction indicated by the DTCs in table below.

(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.)



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


PROCEDURE

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

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 ignition switch is ON (READY).



b.

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


c.

Turn the ignition switch off.


Result:
Proceed to
NEXT



NEXT

2.CHECK HV BATTERY
2.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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.



b.
A517685N01
0.917,0.573 1.26,0.781 0.344,0.208 2.083,1.01 2.406,1.271 0.323,0.26 0.958,0.594 1.229,0.792 0.271,0.198 10 true z26 2.115,1.031 2.385,1.229 0.271,0.198 10 true z23

Disconnect the 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.



c.

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

Standard Voltage:
Tester Connection Condition
z26-1 (+) - z23-1 (-) Ignition switch off


CAUTION:

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



d.

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



e.

Reconnect the HV battery high voltage connectors.



A

3.REPLACE BATTERY ECU ASSEMBLY

B

4.CHECK FREEZE FRAME DATA (HYBRID/EV BATTERY VOLTAGE)
4.CHECK FREEZE FRAME DATA (HYBRID/EV BATTERY VOLTAGE)
a.

Read the freeze frame data of DTC P31B300.

Powertrain > Hybrid Control > DTC(P31B300) > Freeze Frame Data
Tester Display
Hybrid/EV Battery Voltage
50040 397 227 P31B300
Result:
Result Proceed to
"Hybrid/EV Battery Voltage" is less than 292 V. A
Other than above B



b.

Turn the ignition switch off.



A

REPLACE INVERTER WITH CONVERTER ASSEMBLY

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>INVERTER WITH CONVERTER>REMOVAL


B

5.REPLACE BATTERY ECU ASSEMBLY