Component Inspection
- Check PCV
- IG "OFF". Remove PCV valve from rocker cover.
- Insert a thin tool into the PCV valve from the threaded side and verify that the plunger is moving.
- Is the PCV valve moving correctly?
YES
- Go to " 2Check PCSV" as follows.
NO
- Substitute with a known - good PCV and check for proper operation.
If the problem is corrected, replace PCV and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Check PCSV
- IG "OFF". Disconnect PCSV and Vacuum Hose.
- Apply vacuum on PCSV with Hand Vacuum Gauge.
- Is the PCSV keeping the Vacuum?
YES
- Go to " 3Check injector" as follows.
NO
- Substitute with a known - good PCSV and check for proper operation.
If the problem is corrected, replace PCSV and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Check injector for normal operation
- Start engine.
- Check that RPM decrease when performing the injector's actuation test.
- Is there any cylinder with no change in RPM or only a small change in RPM?
YES
- Substitute with a known-good Injector and check for proper operation. If the problem is corrected, replace Injector and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Go to " 4Check sensors related to Fuel Trim" as below.
- Check Sensors related to Fuel Trim
- Check the Input Voltage of Sensors related to Fuel Trim (MAPS, TPS, ECTS, PCSV, Injector, and etc.) - Refer to ENGINE CONTROL SYSTEM - 2.4L - SONATA .
- Are the sensors related to Fuel Trim O.K?
YES
- Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.