Dtc B2274 Acc 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 DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC RELAY)

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 POWER MANAGEMENT CONTROL ECU

DTC B2274 ACC Monitor Malfunction


DESCRIPTION

This DTC is stored when there is a problem in the ACC output circuit, which is from the ACC output terminal of the power management control ECU to the ACC relay.
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
B2274
The ACC relay actuation circuit inside the power management control ECU or other related circuit is malfunctioning.
  1. AM2 fuse
  2. Main body ECU (Driver side junction block assembly) (ACC relay)
  3. Power management control ECU
  4. 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 B2274 Acc 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 B2274 Acc 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 B2274 Acc 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 DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC RELAY)


    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 B2274 Acc 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-48 - 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


4.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
    G51-19 (ACCD) - 2A-48
    		Always
    		Below 1 Ω
    G51-19 (ACCD) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.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


6.CHECK POWER MANAGEMENT CONTROL ECU


  1. Connect the 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 B2274 Acc 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
    G51-19 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (ACC)
    		((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)