Dtc B2273 Ignition 2 Monitor Malfunction

Vehicle Interior. Corolla. Zre142 Aze141
Theft Deterrent Keyless Entry. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

CHECK FRO DTC

CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - MAIN BODY ECU AND BODY GROUND)

INSPECT ENGINE ROOM JUNCTION BLOCK (IG2 RELAY)

DTC B2273 Ignition 2 Monitor Malfunction


DESCRIPTION

This DTC is output when there is a problem in the IG2D output circuit, which is from the inside of the main body ECU (instrument panel junction block) to the IG2 relay.
HINT:
When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, 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.
After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobiliser system (COROLLA_ZRE142 RM000000QYF05AX.html).

DTC No.
DTC Detection Condition
Trouble Area
B2273
IG2 relay actuation circuit inside main body ECU (instrument panel junction block) or other related circuit is malfunctioning
  1. Main body ECU (instrument panel junction block)
  2. IG2 relay
  3. Wire harness or connector

WIRING DIAGRAM


Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B2273 Ignition 2 Monitor Malfunction


INSPECTION PROCEDURE

1.READ VALUE USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the engine switch on (IG) and turn the Techstream on.

  1. Read the Data List according to the displays on the Techstream.

    HINT:
    When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts.

    Main Body
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    IG2 Relay Monitor (Outside)
    		Status of IG2 relay monitor (outer) / ON or OFF
    		ON: Engine switch on (IG) (IG2 relay is ON)
    OFF: Engine switch off (IG2 relay is OFF)
    		-
    OK:
    "ON" (Engine switch on (IG)) appears on the screen.


NG
Go to step 3
OK


2.CHECK FRO DTC

  1. Clear the DTC (COROLLA_ZRE142 RM000000YEH0CGX.html).

  1. Turn the engine switch on (IG).

  1. After 10 seconds have elapsed, check if the trouble occurs again.

    OK:
    DTC B2273 is not output.


NG
REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
OK

USE SIMULATION METHOD TO CHECK (COROLLA_ZRE142 RM000000UZ108OX.html)

3.CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - MAIN BODY ECU AND BODY GROUND)


  1. Disconnect the 1A connector from the engine room junction block.


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B2273 Ignition 2 Monitor Malfunction

  1. Disconnect the E51 ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1A-2 - E51-5 (IG2D)
    		Always
    		Below 1 Ω
    1A-2 - Body ground
    		Always
    		10 kΩ or higher
    1A-3 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM JUNCTION BLOCK - MAIN BODY ECU AND BODY GROUND)
OK


4.INSPECT ENGINE ROOM JUNCTION BLOCK (IG2 RELAY)


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B2273 Ignition 2 Monitor Malfunction

  1. Disconnect the 1E connector from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1A-4 - 1E-1
    		When battery voltage is not applied to terminals 1A-3 and 1A-2
    		10 kΩ or higher
    1A-4 - 1E-1
    		When battery voltage is applied to terminals 1A-3 and 1A-2
    		Below 1 Ω


NG
REPLACE ENGINE ROOM JUNCTION BLOCK
OK

REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)