Purpose
To determine if intake, exhaust, VGT, and EGR systems are working correctly
NOTE: Before doing this test, make sure tests 1 through 12 were completed. Problems with other systems (injectors, fuel supply, etc.) can affect air management test results.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
Procedure
NOTE: The KOEO Injector Test can only be done with the EST using MasterDiagnostics® software.
1. Open D_KOER_AirManagement.ssn to monitor engine operation.
2. Select Diagnostics from menu bar.
3. Select Key-On Engine-Running Tests from the drop down menu.
NOTE: When using the EST to do KOEO or KOER diagnostic tests, Standard Test is always selected and run first. If the ignition switch is not cycled, the Standard Test does not have to be run again.
4. From the KOER Diagnostics menu, select Air Management test and select Run to start the test.
The ECM will start the Air Management Test and command the engine to accelerate to a predetermined rpm.
The ECM will monitor the effects of the VGT and EGR control valve movement using feedback signals from the EBP
sensor.
• If a problem is detected the ECM will cancel the test, set a DTC, and restore normal engine operation.
5. Record DTCs on Diagnostic Form. See “Diagnostic Trouble Codes” – Appendix C (page 643) for DTCs.
6. Correct problems causing active DTCs. To help do Test 14 VGT Test.
7. Clear DTCs.
Possible Causes
• Exhaust leaks
• Intake leaks
• Intake and exhaust restrictions
• Plugged EBP tube assembly
• Biased MAP or EBP sensor
• Failed VGT actuator
• Failed turbocharger
• Failed EGR control valve
