DTC P0091-00: Fuel Pressure Regulator Control Circuit Low Input: Notes
DTC P0091:00 (PCM, SKYACTIV-G 2.5T) DETECTION CONDITION AND POSSIBLE CAUSE
| 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/Snapshot data is available.
- DTC is stored in the PCM memory.
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| FAIL-SAFE FUNCTION |
- Stops high pressure fuel pump control
- Limits intake air amount
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| 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
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 Courtesy of MAZDA MOTORS CORP.
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CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.