Advanced Diagnostics

Advanced Diagnostics

DTC P2261: Turbocharger Bypass Control Valve Stuck Closed
















General Description
When the throttle is closed at an engine boost condition, the powertrain control module (PCM) opens the turbocharger bypass control solenoid valve and releases the pressure between the intercooler and the throttle body upstream of the turbocharger compressor.
When the valve does not open at deceleration due to a turbocharger bypass control solenoid valve operation failure, the pressure change occurs at the turbocharger boost sensor output due to compressor surge.
The turbocharger bypass control solenoid valve operation failure is judged by detecting this pressure wave with the filter.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
The pulse method of releasing pressure accumulation from the turbocharger bypass control solenoid valve is 350 or more for at least 2.5 seconds.

Driving Pattern
The throttle valve fully closed deceleration from fully open acceleration at 4,500 rpm or more for at least 2.5 seconds.

- From the amount of intake air to flow through the turbocharger 120 L/min (126.9 US qt/min, 105.6 Imp qt/min) at 4,000 rpm fully open acceleration (Endurance requirement).
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the PCM memory. If the malfunction recurs during the next (second) drive cycle, the MIL comes on and the DTC and the freeze frame data are stored.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.
The MIL, the DTC, the Temporary DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.