DTC P1CFA-12: IGB Signal Circuit Short to Auxiliary Battery [08/2023 - ]: Procedure

Refer to PROCEDURE - Step 1

Result

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  2

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

   HINT: 

   Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2022 - ]

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  3

Pre-procedure1

• Turn the ignition switch off.

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component with harness connected (Hybrid Vehicle Control ECU)

  -

  -

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C59-5 (IGB) - Body ground	Ignition switch off	Below 1 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

See step  4

Pre-procedure1

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

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component with harness connected (Hybrid Vehicle Control ECU)

  -

  -

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C59-5 (IGB) - Body ground	Ignition switch off	Below 1 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

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

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR