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

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

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.