DTC Advanced Diagnostics: P0034
DTC P0034:Turbocharger Bypass Control Solenoid Valve Circuit Low Voltage

General Description

The turbocharger bypass control solenoid valve is activated by the powertrain control module (PCM) to control the turbocharger bypass control solenoid valve timing to improve boost response during acceleration immediately after deceleration and boost pressure decrease during deceleration. The turbocharger bypass control solenoid valve is normally closed (negative pressure side). If the return signal is CLOSE for a specified duration when the PCM outputs an OPEN signal to the turbocharger bypass control solenoid valve, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
1 second or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
12 volt battery voltage [BATTERY]
10 V
–
State of the engine
Running
[ ]: HDS Parameter

Malfunction Threshold
The return signal is CLOSE for at least 1 second when the PCM outputs an OPEN signal to the turbocharger bypass control solenoid valve.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Turbocharger bypass control solenoid valve ABV line short to ground
PCM internal circuit failure

Confirmation Procedure
Operating Condition
Start the engine, and let it idle for at least 1 second.

With the HDS
Do the ABV TEST in the INSPECTION MENU with the HDS.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.