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Home >> Saturn >> 2007 >> Aura Green Line >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.4L - DTC P0420 To DTC P2544 >> DTC P2172 >> Circuit/System Verification
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Circuit/System Verification

  1. If there are any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  2. Compare the desired engine idle speed to the actual engine idle speed with a scan tool. Actual engine idle speed should be no greater than or less than 100 RPM of desired.
  3. With a scan tool in output controls, increase the engine speed in 25 RPM increments while comparing the desired engine speed to the actual engine speed. The actual engine speed should stay within 25 RPM of the desired engine speed.
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