HYBRID CONTROL SYSTEM, Diagnostic DTC:P253012

DTC Code DTC Name
P253012 IG2 Signal Circuit Short to Auxiliary Battery

DESCRIPTION

The hybrid vehicle control ECU compares the IG2 signal to the IG control status signal sent from the certification ECU (smart key ECU assembly) to detect a stuck on malfunction of the IG2 signal.

Tech Tips

If DTC P253012 is stored, the power switch will turn off (READY off).

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P253012 IG2 Signal Circuit Short to Auxiliary Battery

The IG2 signal of the hybrid vehicle control ECU and the IG control status signal sent from the certification ECU (smart key ECU assembly) do not match.

(1 trip detection logic)

  • Auxiliary battery

  • Certification ECU (smart key ECU assembly)

  • Hybrid vehicle control ECU

  • ECM

  • NO. 1 integration relay

  • Wire harness or connector

 Does not come on

Master Warning Light:

Comes on

CONFIRMATION DRIVING PATTERN

Tech Tips

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


  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 wait for 15 seconds or more.

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

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

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

  9. 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

A003KP6E04

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK AUXILIARY BATTERY VOLTAGE


    1. Turn the power switch off and turn on the high beam headlights for 30 seconds. This will remove the surface charge from the auxiliary battery.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Positive (+) auxiliary battery terminal - Negative (-) auxiliary battery terminal 20°C (68°F), Power switch off 11.0 V or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHARGE OR REPLACE AUXILIARY BATTERY Click here

    OK

  2. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Clear the DTCs.


      Powertrain > Hybrid Control > Clear DTCs

    5. Turn the power switch off.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Turn the power switch on (IG) and wait for 15 seconds or more.

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

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

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

    6. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      P253012 is output. A
      P253012 is not output. B

    7. Turn the power switch off.


    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  4. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      U011087, U012987, U014087, U015187, U016487 or U117087 is also output. A
      U011087, U012987, U014087, U015187, U016487 or U117087 is not output. B

    5. Turn the power switch off.


    B

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A

  5. CHECK HYBRID VEHICLE CONTROL ECU


    1. B006IBMC31
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      Disconnect the I2 hybrid vehicle control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I2-35 (IG2) - I2-12 (E01) Power switch off 9 V or higher

    3. Reconnect the I2 hybrid vehicle control ECU connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    OK

  6. CHECK ECM


    1. B006IBMC31
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      Disconnect the I2 hybrid vehicle control ECU connector.

    2. Disconnect the A31 and C31 ECM connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I2-35 (IG2) - I2-12 (E01) Power switch off 9 V or higher

    4. Reconnect the A31 and C31 ECM connectors.

    5. Reconnect the I2 hybrid vehicle control ECU connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

  7. INSPECT NO. 1 INTEGRATION RELAY (IG2 NO. 1 RELAY)

    Click here

    Result
    Proceed to
    OK
    NG

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 INTEGRATION RELAY)


    1. Disconnect the I2 hybrid vehicle control ECU connector.

    2. Remove the NO. 1 integration relay from the No. 1 engine room relay block and No. 1 junction block assembly.

    3. A003KGKC32
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I2-35 (IG2) - Body ground Power switch off 1 V or less

    4. Install the NO. 1 integration relay.

    5. Reconnect the I2 hybrid vehicle control ECU connector.

      Result
      Proceed to
      OK
      NG

    OK

    Check for intermittent problems. Click here Check the connection and terminal contact pressure of the connectors and wire harnesses between the hybrid vehicle control ECU and the No. 1 engine room relay block and No. 1 junction block assembly. When the power switch is on (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU and the No. 1 engine room relay block and No. 1 junction block assembly.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. CHARGE OR REPLACE AUXILIARY BATTERY


    1. Charge or replace the auxiliary battery.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 2 Click here