Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: DC/DC Converter Internal Electronic Failure (P1CCC49)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / DC/DC Converter Internal Electronic Failure (P1CCC49)

DESCRIPTION

The DC/DC converter converts the voltage from the HV battery to supply power to the vehicle lights, audio system and various ECUs, etc.

At the same time, it performs charging of the auxiliary battery, controlling the output voltage to maintain a specific voltage at the auxiliary battery terminal.

Via CAN communication, the hybrid vehicle control ECU sends stop commands to the DC/DC converter, and receives DC/DC converter Normal/Malfunction status signals.

When the DC/DC converter is stopped due to a circuit malfunction and the auxiliary battery voltage becomes 11 V or less during READY ON, this DTC is stored.

This DTC may also be stored if a high-voltage insulation malfunction occurs.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P1CCC49

DC/DC Converter Internal Electronic Failure

Any of the following conditions are met:

  • DC/DC converter is malfunction, and auxiliary battery voltage is 11 V or less*
  • DC/DC converter is malfunction for 5 seconds or more

(1 trip detection logic)
  • Hybrid vehicle control ECU
  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Wire harness or connector
  • DC/DC fuse
  • PCU NO. 2 fuse

Does not come on

Master Warning:

Comes on

SAE Code:

P1CCC

HINT:

*: If the DC/DC converter is malfunctioning, its operation and charging will be stopped and the auxiliary battery voltage will drop.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P19E100.

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 auxiliary negative (-) 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:

  • After repair, clear the DTCs, turn the ignition switch off and wait for 30 seconds or more and perform the following procedure to confirm that the auxiliary battery low voltage indicated by this DTC has been repaired.
    1. Wait for 2 minutes with the shift lever in P, the ignition switch ON (READY) and the following conditions met, then confirm that Data List item "BATT Voltage (Hybrid control system)" is between 13.0 and 15.0 V.

      (If charging is not performed and the electrical load increases, +B voltage may not be steady and will gradually drop.)

      1. Headlight switch is in the HI position.
      2. A/C blower fan switch is in the HI position.
      3. Window defogger switch is turned on.
  • By performing the following procedure, the DC/DC converter function can be checked.
    1. Connect the AC/DC 400 A probe to the positive (+) auxiliary battery cable.
      1. Turn the ignition switch to ON (READY) and leave the vehicle as is until the electric current flowing to the auxiliary battery becomes 10 A or less.
      2. Turn the ignition switch to ON (READY) and turn the headlight switch and A/C blower fan switch to the HI position and the window defogger on.
      3. Confirm that the current drawn from the auxiliary battery is 0 A or lower and the auxiliary battery voltage is between 13.0 and 15.0 V.
  • This DTC may be also stored when a part other than the DC/DC converter is malfunctioning or depending on user operation.
  • If this vehicle is used to jump start another vehicle with a discharged battery, a fuse may blow due to overcurrent or the DC/DC converter self-protection may be activated. Also, if this vehicle is jump started by a vehicle with a 24 V battery, the same malfunction may occur and this DTC may be stored. (The suspended DC/DC converter control will return to normal by clearing the DTCs and turning the ignition switch off.)
  • Check whether high electrical load equipment such as a high-capacitance audio device or electric kettle is used in the vehicle. (A fuse of the auxiliary battery may be blown due to overcurrent.)
  • If the DC/DC converter is malfunctioning, the auxiliary battery cannot be charged. Therefore, once the ignition switch is turned off, it may be impossible to turn it to ON (READY) again if the auxiliary battery is completely discharged. In this case, charge the auxiliary battery. Be careful as charging is not performed during the inspection.
  • If the ignition switch turns off immediately after it is turned to ON (READY), the auxiliary battery voltage may be low. Charge the auxiliary battery.
  • P1CCC49 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.)

      Malfunction Content

      System

      Relevant DTC

      Insulation Malfunction

      Hybrid control system

      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

      High Voltage Circuit Malfunction

      Hybrid control system

      P0AA649

      Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure

      P0AD911

      Hybrid/EV Battery Positive Contactor Circuit Short to Ground

      P0ADD11

      Hybrid/EV Battery Negative Contactor Circuit Short to Ground

      P1C8449

      High Voltage Power Resource Circuit Short during Ready ON

      P300449

      High Voltage Power Resource Circuit Short during Pre-Charge

      System malfunction

      Hybrid control system

      U01BD87

      Lost Communication with DC/DC Converter Control Module "C"

PROCEDURE

1.

CHECK FUSE (DC/DC)

Click here

NG

GO TO STEP 15

OK

2.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

NG

CONNECT SECURELY
OK

3.

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

4.

CHECK FUSE (PUC NO. 2)

Click here

NG

REPLACE FUSE (PUC NO. 2)
OK

5.

CHECK HARNESS AND CONNECTOR (DC/DC CONVERTER POWER SOURCE CIRCUIT)

Click here

NG

REPLACE MALFUNCTIONING PARTS
OK

6.

CHECK AMD TERMINAL VOLTAGE

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK AMD TERMINAL CONNECTION CONDITION

Click here

Result

Proceed to

There are no arc marks.

The terminal is connected securely and there are no contact problems.

A

There are no arc marks.

The terminal is not connected securely and there is a contact problem.

B

There are arc marks.

-

C
B

CONNECT SECURELY
C

REPLACE MALFUNCTIONING PARTS
A

8.

CHECK GROUND WIRE CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY)

Click here

OK:

The ground wire is securely installed.

NG

CONNECT SECURELY
OK

9.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

INSPECT HYBRID VEHICLE CONTROL ECU

Click here

NG

REPLACE HYBRID VEHICLE CONTROL ECU

OK

11.

CHECK DC/DC CONVERTER FUNCTION

Click here

OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY

NG

12.

CHECK HIGH VOLTAGE INSULATION

Click here

OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY

NG

13.

CHECK GENERATOR HIGH-VOLTAGE CIRCUIT

Click here

NEXT

14.

CHECK MOTOR HIGH-VOLTAGE CIRCUIT

Click here

HINT:

If the "Motor High-voltage Circuit" inspection results are normal, perform the next step.

NEXT

REPLACE INVERTER WITH CONVERTER ASSEMBLY

15.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)

Click here

NG

GO TO STEP 18

OK

16.

CHECK INVERTER WITH CONVERTER ASSEMBLY (AMD TERMINAL)

Click here

OK

REPLACE FUSE (DC/DC)
NG

17.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

Click here

NEXT

REPLACE FUSE (DC/DC)

18.

REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT

REPLACE FUSE (DC/DC)

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