DTC    B2271    Ignition Hold Monitor Malfunction

for Preparation Click here


DESCRIPTION

This DTC is stored when a malfunction in the IG1 drive circuit, IG2 drive circuit or IG hold circuit in the power management control ECU is detected.

HINT:
  1. When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) auxiliary battery terminal, the power source mode changes to on (IG).
  2. When the auxiliary battery cable is disconnected and reconnected, the power source returns to the mode it was in before the auxiliary battery cable was disconnected.


DTC Code
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2271
Either condition is met (1-trip detection logic*):
  1. The IG1 or IG2 drive circuit in the power management control ECU is malfunctioning.
  2. The IG hold circuit in the power management control ECU is malfunctioning.
  1. AM2 fuse
  2. IG1 relays (Instrument panel junction block assembly)
  3. IG2 relay (No. 2 integration relay)
  4. Power management control ECU
  5. Wire harness or connector
Turn the power switch on (IG).

HINT:
To turn the power switch on (IG), carry the key and press the power switch twice with park (P) selected and the brake pedal released.

  1. *: Only output while a malfunction is present and the power switch is on (IG)

HINT:
  1. The IG1 and IG2 drive circuits activate the IG1 and IG2 relays.
  2. After the IG1 and IG2 drive circuits turn on, even if the power management control ECU operates incorrectly, the IG hold circuit maintains the power switch on (IG) state.


Vehicle Condition and Fail-safe Function when Malfunction Detected 
Vehicle Condition when Malfunction Detected
Fail-safe Function when Malfunction Detected
The power source mode is not allowed to change to on (IG) (the hybrid control system cannot be started).
The power source mode cannot be changed to on (IG).

WIRING DIAGRAM


B273642E01


INSPECTION PROCEDURE

NOTICE:
  1. When using the intelligent tester with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle, select the vehicle type under manual mode, and then enter the following menus:
    for Power Source Control: Body / Power Source Control / DTC.
    for Entry&Start: Body / Entry&Start / DTC.
  2. The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting (Click here).
  3. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  4. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.


HINT:

Related Data List and Active Test Items 
DTC
Data List Item
Active Test Item
B2271
Power Source Control
  1. IG1 Relay Monitor (Inside)
  2. IG2 Relay Monitor (Inside)
  3. Latch Circuit
-

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

  1. Disconnect the H3 and H4 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
    H3-1 (AM22) - Body ground
    		Always
    		9.5 to 16 V
    H4-7 (AM21) - Body ground
    		Always
    		9.5 to 16 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
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
    H3-5 (E01) - Body ground
    		Always
    		Below 1 Ω
    H3-6 (E1) - Body ground
    		Always
    		Below 1 Ω
    H4-4 (E12) - Body ground
    		Always
    		Below 1 Ω
    H4-5 (E02) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT NO. 2 INTEGRATION RELAY (IG2 RELAY)


    A172755E37

  1. Remove the No.2 integration relay. (Click here)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1A-2 - 1A-3
    		20°C (68°F)
    		130 to 230 Ω

    Text in Illustration 
    *a
    		Component without harness connected
    (No.2 Integration Relay)



NG
REPLACE NO. 2 INTEGRATION RELAY (Click here)
OK


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


    B231373E14

  1. Remove the instrument panel junction block assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2B-25 - 2B-4
    		20°C (68°F)
    		52.32 to 79.32 Ω
    2B-25 - 2B-6
    		20°C (68°F)
    		52.32 to 79.32 Ω
    2B-4 - 2B-6
    		Always
    		Below 1 Ω

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



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


5.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL JUNCTION BLOCK)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H4-2 (IG1D) - 2B-25
    		Always
    		Below 1 Ω
    H4-2 (IG1D) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

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


7.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 2 INTEGRATION RELAY)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A20-2 (IG2D) - 1A-2
    		Always
    		Below 1 Ω
    A20-2 (IG2D) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BODY GROUND)

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

    Standard Resistance:
    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


    B229525E10

  1. Install the instrument panel junction block assembly (Click here).

  1. Install the No. 2 integration relay.

  1. Reconnect the A20 and H4 connectors.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A20-2 (IG2D) - Body ground
    		Power switch on (IG)
    		Output voltage at terminal AM21 or AM22 is -2.5 V or more
    H4-2 (IG1D) - Body ground
    		Power switch on (IG)
    		Output voltage at terminal AM21 or AM22 is -2.5 V or more

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



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)