DTC B2271: Ignition Hold Monitor Malfunction: Procedure

1. Disconnect the D43 connector from the power management control ECU.
   Fig 1: Inspecting Power Management Control ECU Connector Terminals

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D43-1 (AM22) - Body ground	Always	9.5 to 16 V
   D43-2 (AM21) - Body ground	Always	9.5 to 16 V

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU) 

OK: Go to next step 

1. Disconnect the D43 connector from the power management control ECU.
   Fig 2: Inspecting D43 Power Management Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D43-5 (GND2) - Body ground	Always	Below 1 Ω
   D43-6 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND) 

OK: Go to next step 

1. Disconnect the 2G connector from the main body ECU (driver side junction block assembly).
   Fig 3: Checking Power Management Control ECU And Driver Side Junction Block Connector Terminals

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D43-20 (IG1D) - 2G-29	Always	Below 1 Ω
   D43-20 (IG1D) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1

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

   *2

   Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK) 

OK: Go to next step 

1. Disconnect the 2F connector from the main body ECU (driver side junction block assembly).
   Fig 4: Checking Main Body ECU (Driver Side Junction Block Assembly) Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2F-16 - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the IG1 relay from the main body ECU (driver side junction block assembly).
   Fig 5: Inspecting ACC Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Always	93.8 to 136.4 Ω
   3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE IG1 RELAY 

OK: Go to next step 

1. Remove the main body ECU (driver side junction block assembly).
   Fig 6: Inspecting Driver Side Junction Block Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2G-29 - IG1 relay terminal 2	Always	Below 1 Ω
   2G-29 - Body ground	Always	10 kΩ or higher
   2F-16 - IG1 relay terminal 1	Always	Below 1 Ω
   2F-16 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Components without harness connected (Main Body ECU (Driver Side Junction Block Assembly))	*3	Component without relay connected (IG1 relay terminal)
   *2	Components without harness connected (Main Body ECU (Driver Side Junction Block Assembly))	*4	-

NG → See step   10 

OK: Go to next step 

1. Disconnect the D42 connector from the power management control ECU.
   Fig 7: Inspecting Power Management Control ECU And IG2 Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the IG2 relay from the engine room relay block.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D42-8 (IG2D) - IG2 relay terminal 1	Always	Below 1 Ω
   D42-8 (IG2D) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1

   Front view of wire harness connected (to Power Management Control ECU)

   *2

   Component without relay connected (IG2 relay terminal)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 8: Identifying IG2 Relay Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   IG2 relay terminal 2 - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without relay connected (IG2 Relay Terminal)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BODY GROUND) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 9: Identifying Relay Test Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Always	93.8 to 136.4 Ω
   3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE IG2 RELAY 

OK → See step   11