B2271

THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): B2271: Ignition Hold Monitor Malfunction
B2271 - Ignition Hold Monitor Malfunction

DESCRIPTION

This DTC is stored when a malfunction in the IG1 circuit, IG2 circuit or IG hold circuit in the certification ECU (smart key ECU assembly) is detected.

HINT
When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.





* *: Only detected while a malfunction is present and the engine switch is on (IG)

HINT
* The IG1 and IG2 circuits activate the IG1 and IG2 relays.
* After the IG1 and IG2 circuits turn on, even if the CPU operates incorrectly, the IG hold circuit maintains the power source mode in on (IG).

Vehicle Condition and Fail-safe Function when Malfunction Detected





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When using the Techstream with the engine 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 Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.
* The smart key system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting How To Proceed With Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
* Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Start Function) precaution Smart Key System (for Start Function).
* Inspect the fuses of circuits related to this system before performing the following inspection procedure.
* 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










PROCEDURE

1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)





(a) Disconnect the A43 connector from the certification ECU (smart key ECU assembly).

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

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (GROUND)





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the A43 certification ECU (smart key ECU assembly) connector.





Text in Illustration





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

Standard Voltage:





NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting