P0234
P0234-TURBOCHARGER OVERBOOST CONDITIONWHEN MONITORED
While running.
SET CONDITION
The intake air pressure is above a calibrated value for a calibrated amount of time.
POSSIBLE CAUSES
- Other DTC's
- Wastegate stuck
- Turbocharger and/or wastegate damage
- Wastegate
- Turbocharger
- Wastegate control valve
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. OTHER DTC'S
With the scan tool, read DTCs.
Q: Do you have additional DTC's?
YES: Repair all other DTC's first. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Go To 2
2. TURBOCHARGER AND/OR WASTEGATE DAMAGE
Visually inspect the turbocharger assembly for signs of damage. Pay particular attention to the Wastegate area and linkage.
Q: Was any damage noticed?
YES: Repair or replace the Turbocharger or Wastegate. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Go To 3
3. WASTEGATE
Pressure the Intake air system per test INTAKE AIR SYSTEM PRESSURE TEST.
Pay particular attention to the Wastegate signal line and the Wastegate actuator canister area for leaks.
Q: Were any leaks detected?
YES: Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Go To 4
4. TURBOCHARGER
Disconnect the wiring connector at the Wastegate Control Valve.
Remove the Wastegate Control Valve from the turbo.
Inspect the O-rings and the valve for damage.
Replace any damaged O-rings or a damaged valve.
Using a pressure/vacuum hand pump, apply vacuum to the tip of the Wastegate Control Valve.
Use your fingers to cover and seal the two radial holes located between the two small O-rings on the tip of the valve.
The valve should hold vacuum.
Q: Does the Wastegate Control Valve hold vacuum?
YES: Repair or replace the Turbocharger. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Replace the Wastegate Control Valve. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1