P0234

P0234-TURBOCHARGER OVERBOOST CONDITION

For complete wiring diagrams refer to Diagrams/Electrical.


- When Monitored:

While running.

- Set Condition:

The intake air pressure is above a calibrated value for a calibrated amount of time.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test


1. OTHER DTC'S

With the scan tool, read DTCs.

Do you have additional DTC's?

Yes

- Repair all other DTC's first.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

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.

Was any damage noticed?

Yes

- Repair or replace the Turbocharger or Wastegate.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

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.

Were any leaks detected?

Yes

- Repair as necessary.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

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.

Does the Wastegate Control Valve hold vacuum?

Yes

- Repair or replace the Turbocharger.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Replace the Wastegate Control Valve.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test