DTC P0091: Notes
DTC P0091 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0091 |
Fuel pressure regulator control circuit low |
| 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, the PCM determines that the spill valve control solenoid valve control circuit has malfunction.
MONITORING CONDITIONS
- The following conditions are met:
- Engine speed is 3, 00 RPM or less.
- Battery voltage is 10 V or more.
Diagnostic support note
- This is a continuous monitor (CCM).
- The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.
- FREEZE FRAME DATA is available.
- DTCs are stored in the PCM memory.
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| POSSIBLE CAUSE |
- Spill valve control solenoid valve malfunction
- Open circuit in the wiring harness between high pressure fuel pump terminal A and PCM terminal 1A
- Open circuit in the wiring harness between high pressure fuel pump terminal B and PCM terminal 1B
- Short to ground in the wiring harness between high pressure fuel pump terminal A and PCM terminal 1A
- Short to ground in the wiring harness between high pressure fuel pump terminal B and PCM terminal 1B
- Connector or terminal malfunction
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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