DTC B2271: Ignition Hold Monitor Malfunction: Procedure

1. Disconnect the D89 power management control ECU connector.
   Fig 1: Checking D89 Power Management Control ECU Connector

   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
   D89-2 (AM21) - Body ground	Always	9.5 to 14 V
   D89-1 (AM22) - Body ground

   TEXT IN ILLUSTRATION
   
   

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

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

OK: Go to next step 

1. Disconnect the D89 power management control ECU connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Checking D89 Power Management Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D89-6 (GND) - Body ground	Always	Below 1 Ω
   D89-5 (GND2) - Body ground

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Connect the power management control ECU connectors.
   Fig 3: Inspecting A35 & D89 Power Management Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Component with harness connected (Power Management Control ECU)

   -

   -

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A35-8 (IG2D) - Body ground	Engine switch off	1 V or less
   	Engine switch on (IG)*	9 V or higher
   D89-20 (IG1D) - Body ground	Engine switch off	1 V or less
   	Engine switch on (IG)*	9 V or higher

   • *: To turn the engine switch on (IG), carry the key and press the engine switch twice with the shift lever in P and the brake pedal released.

NG → See step   4 

OK → SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR)