DTC    B2271    Ignition Hold Monitor Malfunction

for Preparation Click here


DESCRIPTION

This DTC is output when a problem such as an open in the AM2 NO. 2 fuse, an open or short in the wire harness between the fuse and power management control ECU*1 or power source control ECU*2, a short in the IG output circuit inside the power management control ECU*1 or power source control ECU*2, a short between the power management control ECU*1 or power source control ECU*2 and relay, and a short in the relay is detected.

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
B2271
The hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside power management control ECU*1 or power source control ECU*2 is open or short
  1. AM2 No. 2 fuse
  2. MAIN fuse
  3. Instrument panel junction block assembly (IG1 relay 1, 2)
  4. Integration relay (IG2 relay)
  5. Power management control ECU*1
  6. Power source control ECU*2
  7. Wire harness or connector
*1: for 1KR-FE and 1NR-FE
*2: for 1ND-TV

WIRING DIAGRAM


E191928E01


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 AND INTEGRATION RELAY (IG1 NO. 1 RELAY, IG1 NO. 2 RELAY AND IG2 RELAY)


  1. Disconnect the instrument panel junction block assembly connectors.


    B213269E01


    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 - 3C-36
    		When battery voltage absent
    		10 kΩ or higher
    3A-1 - 3B-1
    3A-1 - 3C-36
    		When battery voltage is applied to terminals 3C-23 and 3C-10
    		Below 1 Ω
    3A-1 - 3B-1



    B213270E01

  1. Remove the integration relay from the engine room relay block.

  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
      1A-1 - 1B-6
      		When battery voltage absent
      		10 kΩ or higher
      When battery voltage is applied to terminals 1D-11 and 1C-3
      		Below 1 Ω

      Text in Illustration 
      *1
      		Component without harness connected
      (Integration Relay)

    2. for 1ND-TV

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      1A-1 - 1D-1
      		When battery voltage absent
      		10 kΩ or higher
      When battery voltage is applied to terminals 1D-11 and 1C-3
      		Below 1 Ω

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


B
Go to step 7

C
Go to step 10
A


4.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU)
B213274E02

  1. Disconnect the instrument panel junction block assembly connectors.

  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
      D38-20 (IG1D) - 3C-23
      		Always
      		Below 1 Ω
      3C-10 - Body ground

      Text in Illustration 
      *A
      		for 1KR-FE and 1NR-FE
      *B
      		for 1ND-TV
      *1
      		Front view of wire harness connector
      (to Instrument Panel Junction Block Assembly)
      *2
      		Rear view of wire harness connector
      (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
      *3
      		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
      D73-20 (IG1D) - 3C-23
      		Always
      		Below 1 Ω
      3C-10 - Body ground

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



B
Go to step 7

C
Go to step 10
A


5.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECU)
B213272E02

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the D36 or D72 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
      D36-8 (IG2D) - 1D-11
      		Always
      		Below 1 Ω
      1C-3 - Body ground

      Text in Illustration 
      *A
      		for 1KR-FE and 1NR-FE
      *B
      		for 1ND-TV
      *1
      		Front view of wire harness connector
      (to Integration Relay)
      *2
      		Rear view of wire harness connector
      (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
      *3
      		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
      D72-8 (IG2D) - 1D-12
      		Always
      		Below 1 Ω
      1C-6 - Body ground

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



B
Go to step 9

C
Go to step 7

D
Go to step 10
A


6.INSPECT POWER MANAGEMENT CONTROL ECU
B211613E01

  1. Reconnect the D36 and D38 ECU connectors.

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

Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
D36-8 (IG2D) - Body ground
Engine switch off
Below 1 V
Engine switch on (IG)
Output voltage at terminal AM21 or AM22 is -2 V or more.
D38-20 (IG1D) - 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 

7.REPAIR OR REPLACE HARNESS, CONNECTOR, INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR INTEGRATION RELAY

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


NEXT


8.INSPECT POWER MANAGEMENT CONTROL ECU
B211613E01

  1. Reconnect the D36 and D38 ECU connectors.

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

Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
D36-8 (IG2D) - Body ground
Engine switch off
Below 1 V
Engine switch on (IG)
Output voltage at terminal AM21 or AM22 is -2 V or more.
D38-20 (IG1D) - 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 

9.INSPECT POWER SOURCE CONTROL ECU
B211613E03

  1. Reconnect the D72 and D73 ECU connectors.

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

Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
D72-8 (IG2D) - Body ground
Engine switch off
Below 1 V
Engine switch on (IG)
Output voltage at terminal AM21 or AM22 is -2 V or more.
D73-20 (IG1D) - 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 

10.REPAIR OR REPLACE HARNESS, CONNECTOR, INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR INTEGRATION RELAY

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


NEXT


11.INSPECT POWER SOURCE CONTROL ECU
B211613E03

  1. Reconnect the D72 and D73 ECU connectors.

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

Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
D72-8 (IG2D) - Body ground
Engine switch off
Below 1 V
Engine switch on (IG)
Output voltage at terminal AM21 or AM22 is -2 V or more.
D73-20 (IG1D) - 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