Code No. P0091: High Pressure Fuel Regulator Circuit Low
TROUBLE JUDGMENT
- Short circuit to earth
FAIL SAFE FUNCTION
- Injection shut-off, as if the driver was in overrun.
PROBABLE CAUSE
- Failed high pressure fuel regulator
- Failed electrical harness in high pressure fuel regulator circuit (Refer to Symptom Procedure - High
Pressure Fuel Regulator System
)