13. Boost Pressure Test

13. Boost Pressure Test

Purpose:

The purpose of this test is to determine if the engine can develop sufficient boost to obtain specific power.

Boost Pressure Test

Build Date On Or Before 9-29-03

^ Carefully inspect the intercooler tubes/connections turbocharger connections exhaust system and MAP hose for signs of damage or leaks.
^ Carry out the boost pressure test at 1200 RPM.
^ Monitor the EGR duty cycle MGP RPM and VGT duty cycle PIDS with the scan tool.
^ Control the engine speed to 1200 RPM and EGR duty cycle to 0% with the scan tool.
^ Control the VGT duty cycle to 0% and 85% with the scan tool.






Recommended Procedure:

Note: If the test fails GO to Pinpoint Test KA.

^ Key on engine running.
^ Access and monitor the MGP EGR RPM and VGTDC PIDS.
^ Control the RPM_DSD PID to 1200 RPM and EGRDC PID to 0%.
^ Decrease the VGTDC PID to 0% and record the MGP PID value.
^ Increase the VGTDC PID to 85% and record the MGP PID value.
^ Decrease the VGTDC PID to 0% and record the MGP PID value.

If the MGP PID values are within specifications go to the next step. If the MGP PID values are not within specifications GO to Pinpoint Test KA.

Possible Causes:

^ MAP hose pinched or open
^ Leaking intake hoses or fittings
^ Leaking exhaust system
^ Turbocharger
^ Base engine
^ Intercooler hoses leaking
^ Intercooler
^ EGRsticking

Tools Required

Diagnostic tool

Purpose:

The purpose of this test is to determine if the engine can develop sufficient boost to obtain specific power.

Turbo Boost Test

Build Date On 9-30-03 Or Later:

^ Carefully inspect the intercooler tubes/connections, turbocharger connections, exhaust system and MAP hose for signs of damage or leaks.
^ Carry out the Powertrain Air Management Turbo Boost Test using the scan tool.






Recommended Procedure:

Note: If a sensor fails the turbo boost test, the test will abort. Refer to the appropriate sensor pin point test to continue diagnosis.

Note: Refer to the scan tool information menu for examples of turbo boost test results.

^ Key on, engine running.
^ Carry out the Powertrain Air Management Turbo Boost Test using the scan tool.

If the test fails, GO to Pinpoint Test KA

Possible Causes:

^ MAP hose pinched or open
^ Leaking intake, hoses or fittings
^ Leaking exhaust system
^ Turbocharger
^ Base engine
^ CAC hoses leaking
^ CAC
^ EGR sticking

Tools Required

Scan tool

Tool, vane position sensor cable kit 418-626 or equivalent