Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: DC/DC Converter Temperature Sensor "B" Circuit Voltage Out of Range (P0C3D1C)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Motor Generator Control System / DC/DC Converter Temperature Sensor "B" Circuit Voltage Out of Range (P0C3D1C)

DTC SUMMARY

MALFUNCTION DESCRIPTION

These DTCs indicate that the boost converter temperature sensor (lower) value is abnormal. The cause of this malfunction may be one of the following:

Internal inverter malfunction
  • Inverter with converter assembly internal circuit malfunction
Hybrid cooling system malfunction
  • Coolant circulation abnormal (frozen or leaking, etc.)
Inverter low-voltage circuit malfunction
  • The connectors are not connected properly

DESCRIPTION

The motor generator control ECU, which is built into in the inverter with converter assembly, detects the temperature of the boost converter using a temperature sensor built into the boost converter. If necessary, the motor generator control ECU will limit inverter output to help prevent the boost converter from overheating. The motor generator control ECU also detects malfunctions in the sensor based on the temperature sensor values.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0C3D1C

DC/DC Converter Temperature Sensor "B" Circuit Voltage Out of Range

The actual boost converter temperature (lower) high and the difference between the estimated boost converter temperature (lower) and the actual temperature exceeds a threshold for 10 seconds, or after a long soak, the boost converter temperature (lower) sensor value differs from the values of other sensors.

(1 trip detection logic)
  • Inverter cooling system
  • Cooling fan system
  • Inverter with converter assembly
  • Wire harness or connector

Comes on

Master Warning:

Comes on

SAE Code:

P0C3E

MONITOR DESCRIPTION

If the motor generator control ECU detects a malfunction of the DC/DC Converter Temperature Sensor "B", it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0C3E (INF P0C3D1C): DC/DC converter temperature sensor "B" malfunction (deviation)

Required sensors/components

Inverter, boost converter

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

Motor generator control ECU

DTC P0C3E (INF P0C3D1C) 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 here

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

    Click here

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Turn the ignition switch to ON (READY). [*1]
  4. Drive the vehicle for approximately 10 minutes with the value of Data List item "Inverter Coolant Temperature" 25°C (77°F) or more. [*2]

    HINT:

    [*1] to [*2]: Normal judgment procedure.

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

  5. Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.
  6. 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.

WIRING DIAGRAM

Refer to the wiring diagram for the Cooling System.

Click here

CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click here

NOTICE:

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

    Click here

  • 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 here

HINT:

  • P0C3D1C may be output as a result of the malfunction indicated by the DTCs in table below.
    1. The chart above is listed in inspection order of priority.
    2. 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.)
Table 1

Malfunction Content

Relevant DTC

Insulation malfunction

P1C7C49

Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure

P1C7D49

Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure

P1C7E49

Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure

P1C7F49

Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure

P1C8049

Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure
Table 2

Malfunction Content

Relevant DTC

Sensor and actuator circuit malfunction

P0C7396

Motor Electronics Coolant Pump "A" Component Internal Failure

P314A31

Motor Electronics Coolant Pump "A" No Signal

System malfunction

P0A9300

Inverter "A" Cooling System Performance

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

Click here

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

2.

CHECK COOLING SYSTEM

Click here

HINT:

If the "Cooling System" inspection results are normal, perform the next step.

NEXT

REPLACE INVERTER WITH CONVERTER ASSEMBLY

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