DTC B2271: Ignition Hold Monitor Malfunction [10/2015 - ]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the connector from the power management control ECU.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N91-1 (AM22) - Body ground	Power switch off	11 to 14 V
   N92-7 (AM21) - Body ground	Power switch off	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Management Control ECU)

Result:  NG

NG 

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

Result:  OK

OK 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N91-5 (E01) - Body ground	Always	Below 1 Ω
   N91-6 (E1) - Body ground	Always	Below 1 Ω
   N92-4 (E12) - Body ground	Always	Below 1 Ω
   N92-5 (E02) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Management Control ECU)

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  3

1. Reconnect the power management control ECU connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A36-2 (IG2D) - Body ground	Power switch on (ACC) → Power switch on (IG)	1 V or less → 9 V or higher
   N92-2 (IG1D) - Body ground	Power switch on (ACC) → Power switch on (IG)	1 V or less → 9 V or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

Result:  OK

OK 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

Result:  NG

NG 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to REMOVAL [09/2014 - ] )