OBD Operation Summary for Fiesta - MotorCraftService.com

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Variable Cam Timing Slow ResponseThe response of the actual position on a target position change, which has to be big and quick enough, is evaluated. Theset point and camshaft position are saved at the beginning of a set point change. If this change over a time is big enough(gradient), the camshaft phasing change is evaluated. If the change after the diagnostic time is smaller than a threshold,a slow response is detected, and if the value is greater, then there is no malfunction. By detecting a malfunction, an antibouncecounter is incremented otherwise the counter will be decremented. If the counter exceeds an adjustable limit, theappropriate DTC will be stored.Example 1:Detection of target position changeSetpointOut ofdyn.windowIn dyn.windowTimeConst. time intervalWindowsize =functionof eng.speedExample 2:Set-pointCam. positionSetpoint~stable<strong>for</strong> certainDiagnosticMin.cam.pos.Min.setpointCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 70 OF 111
Variable Cam Timing Slow ResponseStartNOAll monitoringconditions true?YESNOSetpoint stable<strong>for</strong> certain time?YESNOSetpoint changebig enouhg?YESNOMinimum required CAMposition change achievedafter certain time?YESNOAnti bouncecounter incrementAnti bounce counterdecrementNOCounterexceeds lim.?FaultprocessingYESCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 71 OF 111
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OBD Operation Summary for Fiesta - MotorCraftService.com

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