PINPOINT TEST DD: Fuel Rail Pressure (FRP) and Fuel Rail Pressure Temperature (FRPT) Sensors: Introduction
WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
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 rail pressure (FRP) sensor (6B288)
- fuel rail pressure temperature (FRPT) sensor (9G756)
- harness circuits: FRP and FRT
- powertrain control module (PCM) (12A650)
FRP AND FRPT SENSOR VOLTAGE AND PRESSURE SPECIFICATIONS
| Voltage | Pressure (kPa) | Pressure (psi) |
|---|---|---|
| 4.5 | 482 | 70 |
| 3.9 | 413 | 60 |
| 3.4 | 344 | 50 |
| 2.8 | 275 | 40 |
| 2.2 | 207 | 30 |
| 1.6 | 138 | 20 |
| 1.1 | 69 | 10 |
| 0.5 | 0 | 0 |
FRPT SENSOR TEMPERATURE, VOLTAGE, AND RESISTANCE SPECIFICATIONS
| Temperature | Sensor | ||
|---|---|---|---|
| °C | °F | Volts | K Ohms |
| 100 | 212 | 0.47 | 2.073 |
| 95 | 203 | 0.54 | 2.405 |
| 90 | 194 | 0.61 | 2.800 |
| 85 | 185 | 0.70 | 3.273 |
| 80 | 176 | 0.80 | 3.840 |
| 75 | 167 | 0.92 | 4.524 |
| 70 | 158 | 1.06 | 5.351 |
| 65 | 149 | 1.21 | 6.356 |
| 60 | 140 | 1.38 | 7.584 |
| 55 | 131 | 1.56 | 9.091 |
| 50 | 122 | 1.77 | 10.949 |
| 45 | 113 | 1.99 | 13.252 |
| 40 | 104 | 2.23 | 16.123 |
| 35 | 95 | 2.48 | 19.720 |
| 30 | 86 | 2.74 | 24.253 |
| 25 | 77 | 3.00 | 30.000 |
| 20 | 68 | 3.26 | 37.332 |
| 15 | 59 | 3.50 | 46.745 |
| 10 | 50 | 3.73 | 58.911 |
| 5 | 41 | 3.95 | 74.745 |
| 0 | 32 | 4.13 | 95.501 |
| Pin | Circuit |
|---|---|
| 3 | FRP (Fuel Rail Pressure) |
| 2 | SIGRTN (Signal Return) |
| 1 | VREF (Reference Voltage) |
| Pin | Circuit |
|---|---|
| 3 | FRT (Fuel Rail Temperature) |
| 1 | FRP (Fuel Rail Pressure) |
| 4 | SIGRTN (Signal Return) |
| 2 | VREF (Reference Voltage) |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to the REFERENCE VALUES article.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Escape, Mariner |
150 (50-50-50) Pin | E28 E40 E41 E37 |
FRT VREF SIGRTN FRP |
| F-150, Mark LT |
190 Pin | E19 E57 E58 E32 |
FRT VREF SIGRTN FRP |
| Five Hundred, Freestyle, Montego |
150 (50-50-50) Pin | E36 E40 E41 E37 |
FRT VREF SIGRTN FRP |
| Focus | 150 (50-50-50) Pin | E31 E40 E41 E37 |
FRT VREF SIGRTN FRP |
| Taurus | 104 Pin | 90 91 63 |
VREF SIGRTN FRP |
| All other vehicles | 170 Pin | E19 E57 E58 E32 |
FRT VREF SIGRTN FRP |