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Turbocharger System: Notes

  1. Turn ignition off. Connect a scan tool to Data Link Connector (DLC). Start engine. Using scan tool check charge air adaptation percentage wile driving vehicle. Charge air adaptation is normally very slow. Maximum charge air adaptation pulse ratio is 100 percent and minimum is -100 percent. If charge air adaptation percentage pulse ratio is high and positive, check for faulty charge air bypass valve, internal leak in bypass valve, plugged air cleaner or a faulty turbo charger. If charge air adaptation percentage pulse ratio is high and negative, check for faulty charge air bypass valve or faulty turbo charger. Repair or replace as necessary. If charge air adaptation pulse ratio is okay, go to next step.
  2. Turn engine off. Backprobing, connect test light between positive battery terminal and negative side of charge air control valve connector (Blue wire). Start engine and allow it to idle. Test light should flash. Repair or replace as necessary. If test light flashes, using scan tool check charge air control valve pulse ratio percentage. Charge air control valve pulse ratio should be about 2 percent at idle. Repair or replace as necessary. If charge air control valve percentage is as specified, go to next step.
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