PINPOINT TEST DD: Fuel Pressure, Fuel Rail Pressure (FRP) and Fuel Rail Pressure Temperature (FRPT) Sensors: Introduction
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 TEST 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)
- fuel rail pressure temperature (FRPT) sensor (9G756)
- harness circuits: FLP, FRP and FRT
- powertrain control module (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 |
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 |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to REFERENCE VALUES article.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Edge, Explorer | 154 PIN | E18 | VREF SIGRTN |
| E34 | FRP SIGRTN | ||
| E9 | |||
| B21 | VREF FLP | ||
| B7 E7 | |||
| F-150 | 198 PIN | E35 | FRP |
| Focus | 154 PIN | E9 E34 | VREF SIGRTN |
| E40 | FRP SIGRTN | ||
| E35 | VREF FLP | ||
| E17 | |||
| E7 | |||
| All other vehicles | 190-PIN | E29 | FRP |