HYBRID CONTROL SYSTEM, Diagnostic DTC:P1CFA12

DTC Code DTC Name
P1CFA12 IGB Signal Circuit Short to Auxiliary Battery

DESCRIPTION

The hybrid vehicle control ECU assembly monitors the IGB signal received from the certification ECU (smart key ECU assembly). When an error is detected in the IGB signal, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P1CFA12 IGB Signal Circuit Short to Auxiliary Battery

An IGB signal from the hybrid vehicle control ECU assembly is on when the power switch is off.

(1 trip detection logic)

  • Wire harness or connector

  • Hybrid vehicle control ECU assembly

  • Certification ECU (smart key ECU assembly)

 Does not come on

Master Warning Light:

Comes on

CONFIRMATION DRIVING PATTERN

Tech Tips

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

Click here


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

  7. Check the DTC judgment result.

    Tech Tips


    • 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 or N/A, perform driving pattern again.

WIRING DIAGRAM

B000O39E42
*a Certification ECU (Smart Key ECU Assembly)
*b Hybrid Vehicle Control ECU Assembly

CAUTION / NOTICE / HINT

Note

Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR)

    Result
    Proceed to
    OK
    NG

    1. B004C0XC01
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the hybrid vehicle control ECU assembly connectors.

      Click here

      OK
      The connectors are connected securely and there are no contact pressure problems.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT SECURELY

    OK

  2. CHECK CONNECTOR CONNECTION CONDITION (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Check the connector connection condition of the certification ECU (smart key ECU assembly).

      OK
      The connector is connected securely and there are no contact problems.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT SECURELY

    OK

  3. CHECK HARNESS AND CONNECTOR (IGB TERMINAL VOLTAGE)


    1. Turn the power switch off.

    2. B004A95C88
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P65-4 (IGB) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

    NG

  4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the P66 certification ECU (smart key ECU assembly) connector.

    2. B004A95C88
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P65-4 (IGB) - Body ground Power switch off Below 1 V

    3. Reconnect the P66 certification ECU (smart key ECU assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR