DTC B2271-11: IG Circuit Short to Ground [10/2022 - ]: Procedure

Pre-procedure1

• Disconnect the C51 certification ECU (smart key ECU assembly) connector.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C51-6 (+B) - Body ground	Ignition switch off	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

Result: 

OK 

See step  2

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   C51-29 (E) - Body ground	Always	Below 1 Ω	Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Pre-procedure1

• Disconnect the A7 certification ECU (smart key ECU assembly) connector.
• Disconnect the C89 and C90 power distribution box assembly connectors.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  C90-17 - A7-24 (IGPD)	Always	Below 1 Ω	Ω
  C89-10 - A7-11 (IGRD)	Always	Below 1 Ω	Ω
  C90-17 or A7-24 (IGPD) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
  C89-10 or A7-11 (IGRD) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Pre-procedure1

• Disconnect the A72 power distribution box assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  C90-17 - A72-14	Always	Below 1 Ω	Ω
  C90-17 or A72-14 - Other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

Result: 

OK 

See step  5

Pre-procedure1

• Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A72-14 - IGP NO. 1 relay terminal 1	Always	Below 1 Ω	Ω
  A72-14 or IGP NO. 1 relay terminal 1 - Other terminals and body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω	Ω
   3 - 5	Auxiliary battery voltage not applied between terminals 1 and 2	10 kΩ or higher	kΩ

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	IGP NO. 1 Relay

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE IGP RELAY 

Result: 

OK 

See step  7

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   C89-10 - C89-36	Always	20 Ω or higher	Ω
   C89-10 - C90-41	Always	20 Ω or higher	Ω
   C89-10 or C89-36 - Other terminals	Always	10 kΩ or higher	kΩ
   C89-10 or C90-41 - Other terminals	Always	10 kΩ or higher	kΩ

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

Result: 

NG 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ]