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DTC    B2274    ACC Monitor Malfunction

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DESCRIPTION

This DTC is stored when there is a problem in the ACC output circuit. The ACC circuit is the circuit that goes from inside the power management control ECU to the ACC relay.

DTC No.
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. ACC relay
  3. Power management control ECU
  4. Instrument panel junction block assembly
  5. Wire harness or connector

WIRING DIAGRAM


B231374E01


INSPECTION PROCEDURE

NOTICE:
  1. When the power management control ECU is replaced with a new one and the cable from the negative (-) auxiliary battery terminal is connected, the power source mode becomes on (IG) mode. When the auxiliary battery is removed and reinstalled, the power source mode that was selected when the auxiliary battery was removed is restored.
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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

  1. Disconnect the L5 and L6 connectors from the power management control ECU.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L5-1 (AM22) - Body ground
    		Always
    		9.5 to 16 V
    L6-7 (AM21) - Body ground
    		Always
    		9.5 to 16 V



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


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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		 Specified Condition
    L5-5 (E01) - Body ground
    		Always
    		Below 1 Ω
    L5-6 (E1) - Body ground
    		Always
    		Below 1 Ω
    L6-4 (E12) - Body ground
    		Always
    		Below 1 Ω
    L6-5 (E02) - Body ground
    		Always
    		Below 1 Ω



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


3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    B231373E03

  1. Remove the instrument panel junction block assembly.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2A-43 - 2B-4
    		20°C (68°F)
    		81.49 to 118.98 Ω
    2A-43 - 2B-6
    		20°C (68°F)
    		81.49 to 118.98 Ω
    2B-4 - 2B-6
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL J/B)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L6-1 (ACCD) - 2A-43
    		Always
    		Below 1 Ω
    L6-1 (ACCD) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2B-4 - Body ground
    		Always
    		Below 1 Ω
    2B-6 - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)
OK


6.INSPECT POWER MANAGEMENT CONTROL ECU


    B229525E04

  1. Reinstall the instrument panel junction block assembly.

  1. Reconnect the L5 and L6 connectors.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L6-1 (ACCD) - Body ground
    		Power switch on (ACC)
    		Output voltage at terminal AM21 or AM22 is -2.5 V or more

    Text in Illustration 
    *1
    		Component with harness connected
    (Power Management Control ECU)



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)