DTC P1CFA-12: IGB Signal Circuit Short to Auxiliary Battery [11/2015 -]: Procedure

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

   HINT: 

   Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [11/2015 -]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connectors are connected securely and there are no contact pressure problems.

   Result

   Proceed to
   OK
   NG

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 REMOVAL [11/2015 - 12/2018] , or refer to REMOVAL [12/2018 - 07/2020] , or refer to REMOVAL [07/2020 -]

   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

1. Turn the power switch off.
2. 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

   (F3)

   (F3)

   Tester Connection	Condition	Specified Condition
   F3-44 (IGB) - Body ground	Power switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

Result: 

NG 

See step  4

1. Disconnect the F1 certification ECU (smart key ECU assembly) connector.
2. 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

   (F3)

   (F3)

   Tester Connection	Condition	Specified Condition
   F3-44 (IGB) - Body ground	Power switch off	Below 1 V

3. Reconnect the F1 certification ECU (smart key ECU assembly) connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR