DTC B2271: Ignition Hold Monitor Malfunction [08/2019 - ]: Procedure
WARNING: This page is about a different car, the 2022 Toyota Sequoia, 2021 Toyota Sequoia, and 2020 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
- Measure the voltage according to the value(s) in the table below.
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly))Standard Voltage
Tester Connection Switch Condition Specified Condition H197-3 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher Result
Proceed to OK NG
Result:
OK
END (TEMPORARY CONNECTION FAILURE IS SUSPECTED). Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [08/2019 - ]
- Measure the voltage according to the value(s) in the table below.