W/Harness Inspection

Engine Control
P0091 Fuel Pressure Regulator 1 Control Circuit Low - Inspection/Repair:_:W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Control Circuit Inspection

Check Open or Short in FPR circuit
1. IG KEY "OFF".
2. Disconnect FPR connector.
3. IG KEY "ON" & ENG "OFF".
4. Measure the voltage between FPR open, FPR close terminal of FPR harness connector and chassis ground.

Specification :
FPR open Terminal : Approx. 0 - 0.6V
FPR close Terminal : Approx. 0.6V




5. Is the measured voltage within specification?