Dtc B2271 Ignition Hold Monitor Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

INSPECT NO. 1 INTEGRATION RELAY (IG2 RELAY)

INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2 AND IG1 NO. 3 RELAYS)

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

CHECK POWER MANAGEMENT CONTROL ECU

DTC B2271 Ignition Hold Monitor Malfunction


DESCRIPTION

This DTC is stored when a problem, such as an open in the AM2 fuse, an open or short in the wire harness between the fuse and power management control ECU, a short in the IG output circuit inside the power management control ECU, a short between the power management control ECU and relay, or a short in the relay, is detected.
HINT:
When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC Code
DTC Detection Condition
Trouble Area
B2271
The hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside the power management control ECU is open or shorted.
  1. AM2 fuse
  2. Main body ECU (Driver side junction block assembly) (IG1 relays)
  3. No. 1 integration relay (IG2 relay)
  4. Power management control ECU
  5. Harness or connector

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2271 Ignition Hold Monitor Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
  2. Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.
  3. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2271 Ignition Hold Monitor Malfunction

  1. Disconnect the G51 power management control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G51-2 (AM21) - Body ground
    		Always
    		9.5 to 14 V
    G51-1 (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
OK


2.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

  1. Disconnect the G51 power management control ECU connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2271 Ignition Hold Monitor Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G51-6 (GND) - Body ground
    		Always
    		Below 1 Ω
    G51-5 (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


3.INSPECT NO. 1 INTEGRATION RELAY (IG2 RELAY)

  1. Remove the No. 1 integration relay.



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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2271 Ignition Hold Monitor Malfunction


    Text in Illustration
    *A
    		for 1GD-FTV (w/ Urea SCR System)
    		*B
    		except 1GD-FTV (w/ Urea SCR System)
    *a
    		Component without harness connected
    (No. 1 Integration Relay)
    		-
    		-

    Standard Resistance:
    for 1GD-FTV (w/ Urea SCR System):
    Tester Connection
    		Condition
    		Specified Condition
    1J-6 - 1J-3
    		20°C (68°F)
    		500 to 750Ω
    except 1GD-FTV (w/ Urea SCR System):
    Tester Connection
    		Condition
    		Specified Condition
    1A-1 - 1A-3
    		20°C (68°F)
    		255 to 387 Ω


NG
REPLACE NO. 1 INTEGRATION RELAY
OK


4.INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2 AND IG1 NO. 3 RELAYS)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2271 Ignition Hold Monitor Malfunction

  1. Remove the driver side junction block assembly.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2A-52 - 2D-4
    		20°C (68°F)
    		101.25 to 123.75 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (Driver Side Junction Block Assembly)


NG
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
OK


5.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

  1. Disconnect the G51 power management control ECU connector.

  1. Disconnect the 2A driver side junction block assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G51-20 (IG1D) - 2A-52
    		Always
    		Below 1 Ω
    G51-20 (IG1D) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BODY GROUND)

  1. Disconnect the 2D driver side junction block assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2D-4 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)

  1. Disconnect the G50 power management control ECU connector.

  1. Disconnect the 1J*1 or 1A*2 No. 1 integration relay connector.

    1. *1: for 1GD-FTV (w/ Urea SCR System)
    2. *2: except 1GD-FTV (w/ Urea SCR System)

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

    Standard Resistance:
    for 1GD-FTV (w/ Urea SCR System):
    Tester Connection
    		Condition
    		Specified Condition
    G50-8 (IG2D) - 1J-6
    		Always
    		Below 1 Ω
    G50-8 (IG2D) - Body ground
    		Always
    		10 kΩ or higher
    except 1GD-FTV (w/ Urea SCR System):
    Tester Connection
    		Condition
    		Specified Condition
    G50-8 (IG2D) - 1A-1
    		Always
    		Below 1 Ω
    G50-8 (IG2D) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

  1. Disconnect the 1J*1 or 1A*2 No. 1 integration relay connector.

    1. *1: for 1GD-FTV (w/ Urea SCR System)
    2. *2: except 1GD-FTV (w/ Urea SCR System)

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

    Standard Resistance:
    for 1GD-FTV (w/ Urea SCR System):
    Tester Connection
    		Condition
    		Specified Condition
    1J-3 - Body ground
    		Always
    		Below 1 Ω
    except 1GD-FTV (w/ Urea SCR System):
    Tester Connection
    		Condition
    		Specified Condition
    1A-3 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK POWER MANAGEMENT CONTROL ECU

  1. Install the No. 1 integration relay.

  1. Install the driver side junction block assembly.



  1. Connect the power management control ECU connectors.


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2271 Ignition Hold Monitor Malfunction


    Text in Illustration
    *a
    		Component with harness connected
    (Power Management Control ECU)
    		-
    		-

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

    Standard Voltage:

    Tester Connection
    		Switch Condition
    		Specified Condition
    G50-8 (IG2D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
    G51-20 (IG1D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher


NG
REPLACE POWER MANAGEMENT CONTROL ECU (LandCruiser RM0000039R5026X.html)
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)