DTC    B2274    ACC Monitor Malfunction

for Preparation Click here


DESCRIPTION

This DTC is output 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*1 or power source control ECU*2 to the ACC relay.

HINT:
When the power management control ECU*1 or power source control ECU*2 is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.


DTC No.
DTC Detection Condition
Trouble Area
B2274
The ACC relay actuation circuit inside power management control ECU*1 or power source control ECU*2 or other related circuit is malfunctioning.
  1. AM2 No. 2 fuse
  2. MAIN fuse
  3. Instrument panel junction block assembly (ACC relay)
  4. Power management control ECU*1
  5. Power source control ECU*2
  6. Wire harness or connector
*1: for 1KR-FE and 1NR-FE
*2: for 1ND-TV

WIRING DIAGRAM


E191929E01


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK HARNESS AND CONNECTOR (POWER SOURCE)
C185500E33

  1. Disconnect the D38 or D73 ECU connector.

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

    1. for 1KR-FE and 1NR-FE

      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      D38-2 (AM21) - Body ground
      		Always
      		9.5 to 16 V
      D38-1 (AM22) - Body ground

      Text in Illustration 
      *A
      		for 1KR-FE and 1NR-FE
      *B
      		for 1ND-TV
      *1
      		Rear view of wire harness connector
      (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
      *2
      		Rear view of wire harness connector
      (to Power Source Control ECU) (for 1ND-TV)

    2. for 1ND-TV

      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      D73-2 (AM21) - Body ground
      		Always
      		9.5 to 16 V
      D73-1 (AM22) - Body ground



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (GROUND)
C185500E34

  1. Disconnect the D38 or D73 ECU connector.

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

    1. for 1KR-FE and 1NR-FE

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      D38-6 (GND) - Body ground
      		Always
      		Below 1 Ω
      D38-5 (GND2) - Body ground

      Text in Illustration 
      *A
      		for 1KR-FE and 1NR-FE
      *B
      		for 1ND-TV
      *1
      		Rear view of wire harness connector
      (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
      *2
      		Rear view of wire harness connector
      (to Power Source Control ECU) (for 1ND-TV)

    2. for 1ND-TV

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      D73-6 (GND) - Body ground
      		Always
      		Below 1 Ω
      D73-5 (GND2) - Body ground



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)

  1. Disconnect the instrument panel junction block assembly connectors.


B211627E01


Text in Illustration 
*1
Component without harness connected
(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
    3A-1 - 3B-11
    		When battery voltage absent
    		10 kΩ or higher
    When battery voltage is applied to terminals 3D-27 and 3C-10
    		Below 1 Ω



NG
Go to step 6
OK


4.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU)
B211631E02

  1. Disconnect the D38 or D73 ECU connector.

  1. Disconnect the instrument panel junction block assembly connectors.

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

    1. for 1KR-FE and 1NR-FE

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      D38-19 (ACCD) - 3D-27
      		Always
      		Below 1 Ω
      3C-10 - Body ground

      Text in Illustration 
      *A
      		for 1KR-FE and 1NR-FE
      *B
      		for 1ND-TV
      *1
      		Rear view of wire harness connector
      (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
      *2
      		Rear view of wire harness connector
      (to Power Source Control ECU) (for 1ND-TV)
      *3
      		Front view of wire harness connector
      (to Instrument Panel Junction Block)

    2. for 1ND-TV

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      D73-19 (ACCD) - 3D-27
      		Always
      		Below 1 Ω
      3C-10 - Body ground

      Result 
      Result
      		Proceed to
      OK (for 1KR-FE and 1NR-FE)
      		A
      NG (for 1KR-FE and 1NR-FE)
      		B
      OK (for 1ND-TV)
      		C
      NG (for 1ND-TV)
      		D



B
Go to step 6

C
Go to step 8

D
Go to step 9
A


5.INSPECT POWER MANAGEMENT CONTROL ECU
B211613E02

  1. Reconnect the power management control ECU connectors.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D38-19 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM21 or AM22 is -2 V or more.

    Text in Illustration 
    *1
    		Rear view of wire harness connector
    (to Power Management Control ECU)



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

END 

6.REPAIR OR REPLACE HARNESS, CONNECTOR OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  1. Replace with a new or normally functioning part. Repair or replace any damaged wire harness or connector.


NEXT


7.INSPECT POWER MANAGEMENT CONTROL ECU
B211613E02

  1. Reconnect the power management control ECU connectors.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D38-19 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM21 or AM22 is -2 V or more.

    Text in Illustration 
    *1
    		Rear view of wire harness connector
    (to Power Management Control ECU)



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

END 

8.INSPECT POWER SOURCE CONTROL ECU
B211613E04

  1. Reconnect the power source control ECU connectors.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D73-19 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM21 or AM22 is -2 V or more.

    Text in Illustration 
    *1
    		Rear view of wire harness connector
    (to Power Source Control ECU)



NG
REPLACE POWER SOURCE CONTROL ECU (Click here)
OK

END 

9.REPAIR OR REPLACE HARNESS, CONNECTOR OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  1. Replace with a new or normally functioning part. Repair or replace any damaged wire harness or connector.


NEXT


10.INSPECT POWER SOURCE CONTROL ECU
B211613E04

  1. Reconnect the power source control ECU connectors.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D73-19 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM21 or AM22 is -2 V or more.

    Text in Illustration 
    *1
    		Rear view of wire harness connector
    (to Power Source Control ECU)



NG
REPLACE POWER SOURCE CONTROL ECU (Click here)
OK

END