Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: IGB Signal Circuit Short to Auxiliary Battery (P1CFA12)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / IGB Signal Circuit Short to Auxiliary Battery (P1CFA12)

DESCRIPTION

The hybrid vehicle control ECU 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

Note

P1CFA12

IGB Signal Circuit Short to Auxiliary Battery

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

(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
  • Certification ECU (smart key ECU assembly)

Does not come on

Master Warning:

Comes on

SAE Code:

P1CFC

CONFIRMATION DRIVING PATTERN

HINT:

After repair has 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 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. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  7. 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 driving pattern again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

Click here

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

NG

CONNECT SECURELY
OK

2.

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

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

Click here

OK:

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

NG

CONNECT SECURELY
OK

3.

CHECK HARNESS AND CONNECTOR (IGB TERMINAL VOLTAGE)

(a) Turn the ignition switch off.

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

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

I249-5 (IGB) - Body ground

Ignition switch off

Below 1 V
OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

4.

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

(a) Disconnect the certification ECU (smart key ECU assembly) connector.

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

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

I249-5 (IGB) - Body ground

Ignition switch off

Below 1 V

(c) Reconnect the certification ECU (smart key ECU assembly) connector.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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