DTC B2271-11: IG Circuit Short to Ground [11/2023 - ]: Procedure

Pre-procedure1

1. Disconnect the H138 certification ECU (smart key ECU assembly) connector.

   Procedure1

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H138-6 (+B) - Body ground	Ignition switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. 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
   H138-29 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Pre-procedure1

1. Disconnect the A88 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 8B and 8C power distribution box assembly connectors.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   8C-17 - A88-24 (IGPD)	Always	Below 1 Ω
   8B-11 - A88-11 (IGRD)	Always	Below 1 Ω
   8C-17 or A88-24 (IGPD) - Other terminals and body ground	Always	10 kΩ or higher
   8B-11 or A88-11 (IGRD) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Pre-procedure1

1. Disconnect the 8E power distribution box assembly connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   8C-17 - 8E-13	Always	Below 1 Ω
   8C-17 or 8E-13 - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. None

Result: 

NG 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

Result: 

OK 

See step  5

Pre-procedure1

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

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   8E-13 - IGP NO. 1 relay terminal 1	Always	Below 1 Ω
   8E-13 or IGP NO. 1 relay terminal 1 - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. 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
   3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω
   3 - 5	Auxiliary battery voltage not applied between terminals 1 and 2	10 kΩ or higher

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	IGP NO. 1 Relay

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE IGP NO. 1 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
   8B-11 - 8B-36	Always	20 Ω or higher
   8B-11 - 8C-41	Always	20 Ω or higher
   8B-11 or 8B-36 - Other terminals	Always	10 kΩ or higher
   8B-11 or 8C-41 - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ]