Pinpoint Test DD: Fuel Pressure And Fuel Rail Pressure (FRP) Sensors: Introduction: Notes
WARNING:
VEHICLE FUEL SYSTEMS ARE PRESSURIZED EVEN WHEN THE ENGINE IS NOT RUNNING. TO AVOID FIRE OR PERSONAL INJURY, DISABLE THE FUEL DELIVERY SYSTEM AND RELIEVE FUEL SYSTEM PRESSURE BEFORE REMOVING ANY FUEL SYSTEM COMPONENT. REFER TO THE FUEL SYSTEM INFORMATION AT THE BEGINNING OF PINPOINT HC. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
NOTE:
With the engine running, the FRP PID value may be 48-70 kPa (7-10 psi) higher than a fuel pressure reading taken with a mechanical gauge.
This pinpoint test is intended to diagnose the following:
- fuel pressure sensor (9F972)
- fuel rail pressure (FRP) sensor (6B288)
- harness circuits: FLP and FRP
- PCM (12A650)
Tables and Graphs
FRP SENSOR VOLTAGE AND PRESSURE SPECIFICATIONS
| Voltage | Pressure, MPa (gauge) | Pressure, psi (gauge) |
|---|---|---|
| 4.80 | 27.95 | 4054 |
| 4.50 | 26 | 3771 |
| 3.50 | 19.5 | 2828 |
| 2.50 | 13.0 | 1885 |
| 1.50 | 6.5 | 943 |
| 0.50 | 0 | 0 |
| 0.20 | -1.95 | -283 |
| Pin | Circuit |
|---|---|
| 1 | FLP (Fuel Low Pressure) |
| 2 | SIGRTN (Signal Return) |
| 3 | VREF (Reference Voltage) |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Edge 2.7L, Expedition, F-150, Focus GDI 2.0L, Navigator, Transit |
A | 2 3 1 |
FRP SIGRTN VREF |
| Edge 2.0L, MKC 2.3L, Mustang |
B | 4 3 5 |
FRP SIGRTN VREF |
| Fusion 1.5L | C | 3 2 1 |
FRP SIGRTN VREF |
| All other vehicles | C | 2 1 3 |
FRP SIGRTN VREF |