LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2015 >> 3 SV, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> On-Board Diagnostic - Engine Controls (1 Of 6) >> DTC P0091 00: Fuel Pressure Regulator Control Circuit Low Input >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0091 00: Fuel Pressure Regulator Control Circuit Low Input: Notes

DTC P0091:00 DETECTION CONDITIONS AND POSSIBLE CAUSES (SKYACTIV-G 2.0, SKYACTIV-G 2.5)

DTC P0091:00  Fuel pressure regulator control circuit low input 
DETECTION CONDITION 
  • When the PCM turns the spill valve control solenoid valve off but the spill valve control solenoid valve control circuit voltage is low for 5 s  , the PCM determines that the spill valve control solenoid valve control circuit has a malfunction.

    MONITORING CONDITIONS 

    • The following conditions are met:
      • Engine speed: 5, 700 rpm or less 
      • Battery voltage: 10.5 V or more 

Diagnostic support note 
  • This is a continuous monitor (CCM).
  • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
  • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION 
  • Stops high pressure fuel pump control
  • Limits intake air amount
POSSIBLE CAUSE 
  • High pressure fuel pump connector or terminals malfunction
  • PCM connector or terminals malfunction
  • Short to ground in wiring harness between high pressure fuel pump terminal B and PCM terminal 1EF
  • Open circuit in wiring harness between the following terminals:
    • High pressure fuel pump terminal A-PCM terminal 1EE
    • High pressure fuel pump terminal B-PCM terminal 1EF
  • Spill valve control solenoid valve (built-into high pressure fuel pump) malfunction
  • PCM malfunction
G09794644Courtesy of MAZDA MOTORS CORP.
CAUTION:
  • Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDS

Item (definition) Unit/Condition Definition Condition/Specification (Reference)
FUEL_PRES KPa {MPa}, mBar {Bar}, psi, in H20 Fuel pressure
  • Displays fuel pressure
V Fuel pressure sensor voltage
  • Fuel pressure is 3.0 MPa {31 kgf/cm2 , 435 psi}: Approx. 0.92 V
  • Fuel pressure is 4.8 MPa {49 kgf/cm2 , 696 psi}: Approx. 1.17 V
LOAD % Ratio of actual amount of intake air to the maximum air charging amount (mass volume) of cylinder
  • Idle (after warm up): Approx. 17.64%
  • Racing (engine speed is 2, 000 rpm): Approx. 14.51%
  • Racing (engine speed is 4, 000 rpm): Approx. 21.17%
RPM RPM Engine speed
  • Displays engine speed
scientia non olet · About LEMON Manuals