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2015
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Optima LX
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Repair and Diagnosis (Single Page)
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Engine Performance
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System
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Engine Control System Diagnosis (1 Of 3) - 2.4L (Except HEV)
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DTC P0091: Fuel Pressure Regulator 1 Control Circuit Low
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Specification
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Signal Waveform & Data
Signal Waveform & Data
Fig 1: Scantool Data Of Fuel Pressure Regulator (Normal At Idle)
Courtesy of KIA MOTORS AMERICA, INC.
Normal idle state.
Fig 2: Scantool Data Of Fuel Pressure Regulator (Short To Ground)
Courtesy of KIA MOTORS AMERICA, INC.
When FPR circuit shorts to ground.