DTC P0091; Pcm Fuel Pressure Regulator Control Circuit Low Input: Notes
WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & 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 (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
- Fuel injector relay malfunction
- Open or short to ground in wiring harness between fuel injector relay and PCM
- PCM malfunction
|
|
|
CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.