Dtc B2271 Ignition Hold Monitor Malfunction

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - BATTERY)

DTC B2271 Ignition Hold Monitor Malfunction


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 main body ECU (instrument panel junction block), a short in the IG output circuit inside the main body ECU (instrument panel junction block), a short between the main body ECU (instrument panel junction block) and relay, and a short in the relay is detected.
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
B2271
Hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside main body ECU (instrument panel junction block) is open or shorted
  1. AM2 NO. 2 fuse
  2. Main body ECU (instrument panel junction block)
  3. Wire harness or connector

WIRING DIAGRAM


Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B2271 Ignition Hold Monitor Malfunction


INSPECTION PROCEDURE

1.CHECK FOR DTC

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

  1. After all DTCs are cleared, check if the trouble occurs again 6 seconds after the engine switch is turned on (IG).

  1. Check for DTCs again.

    OK:
    DTC is not output.


NG
Go to step 2
OK

USE SYMPTOM METHOD TO CHECK (COROLLA_ZRE142 RM000000UZ108OX.html)

2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - BATTERY)


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B2271 Ignition Hold Monitor Malfunction

  1. Disconnect the E50 and E51 ECU connectors.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E51-1 (AM1) - Body ground
    		Always
    		11 to 14 V
    E50-6 (AM2) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR, OR FUSE
OK

REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)