DTC B2271: Ignition Hold Monitor Malfunction [08/2019 - ]: Description
WARNING: This page is about a different car, the 2021 Toyota Tundra and 2020 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is stored when a malfunction in the IG circuit or IG hold circuit of the certification ECU (smart key ECU assembly) is detected.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| B2271 | Ignition Hold Monitor Malfunction | When either of the following conditions is met (1-trip detection logic*1):
|
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DTC Output Confirmation Operation:
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- *1: Only detected while a malfunction is present.
- *2: The IG circuit and IG hold circuit activate the IG relay.
- *3: After the IG circuit turns on, even if the certification ECU (smart key ECU assembly) malfunctions, the IG hold circuit will maintain the power source mode in on (IG).
VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED
| Vehicle Condition when Malfunction Detected | Fail-safe Function when Malfunction Detected |
|---|---|
| The engine switch cannot be turned on (IG) (the engine cannot be started). | The power source mode cannot be changed to on (IG). |
RELATED DATA LIST AND ACTIVE TEST ITEMS
| DTC No. | Data List and Active Test |
|---|---|
| B2271 | Power Source Control
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