Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test Dd: Fuel Rail Pressure Sensor: Testing
| Fault Code | KOEO | KOER | Continuous Memory |
|---|---|---|---|
| P0190 | DD11 | DD11 | DD16 |
| P0191 | DD17 | DD17 | DD17 |
| P0192 | DD1 | DD1 | DD16 |
| P0193 | DD7 | DD7 | DD16 |
| P1168 (Natural Gas Only) | DD17 | ||
| P1169 (Natural Gas Only) | DD17 |
- 1) For KOEO & KOER Only DTC P0192: Verify DTC With FRP PID
This DTC indicates FRP voltage fell below a minimum calibrated limit and a calibrated minimum amount of time during Comprehensive Component Monitor (CCM). Possible causes for this fault are:- FRP Signal Shorted To SIG RTN Or PWR GND
- FRP Signal Circuit Open (NGV Only)
- Low Fuel Pressure (NGV Only)
- Faulty FRP Sensor
- Faulty PCM
Ensure vehicle has fuel (natural gas vehicles). Turn ignition switch to ON position. Using scan tool, access FRP PID from PID/DATA MONITOR & RECORD menu. If FRP PID voltage is less than .2 volt, go to next step (natural gas vehicles), or step 3) (all others). If FRP PID voltage is .2 volt or more, concern is intermittent. Go to step 13).
- 2) Check Fuel Pressure (Natural Gas Vehicles)
Start engine. Access FRP PID and monitor fuel pressure. If fuel pressure reading is 80-120 psi (552-827 kPa), go to next step. If fuel pressure reading is not 80-120 psi (552-827 kPa), go to TEST HB, step 1) .NOTE: Fuel Rail Pressure (FRP) sensor may also be known as Injection Pressure (IP) sensor. - 3) Generate Opposite Signal
Turn ignition switch to OFF position. Disconnect FRP sensor connector. Connect a jumper wire between FRP SIGNAL and VREF circuits at FRP sensor harness connector. See Fig 1.NOTE: If a scan tool communication concern exists, remove jumper wire and go to step 24).Turn ignition switch to ON position. Using scan tool, access FRP V PID from PID/DATA MONITOR & RECORD menu. If FRP V PID voltage is more than 4.6 volts and vehicle is a no start, go to step 5). All others, replace FRP sensor. If FRP V PID voltage is 4.6 volts or less, disconnect jumper wire and go to next step.
- 4) Check VREF Voltage To FRP Sensor
Ensure FRP sensor is disconnected and ignition switch is turned to ON position. Using a DVOM, measure voltage between VREF and SIG RTN circuits at FRP sensor harness connector. See Fig 1 or Fig 2 . If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to TEST C, step 1). - 5) Check FRP Circuit For Open In Harness
Turn ignition switch to OFF position. Leave FRP sensor disconnected. Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance of FRP circuit between FRP sensor harness connector and PCM harness connector. See PCM CONNECTOR IDENTIFICATION and Fig 1 or Fig 2 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FRP circuit. - 6) Check FRP Circuit For Short To PWR GND Or SIG RTN
Using a DVOM, measure resistance between FRP and SIG RTN terminals at PCM harness connector. Also, measure resistance of FRP circuit between negative battery terminal and PCM harness connector terminal. See PCM CONNECTOR IDENTIFICATION and Fig 1 or Fig 2 . If both resistance measurements are more than 10 k/ohms on no starts, go to TEST HB step 19) . All others, replace PCM. If either resistance measurement is 10 k/ohms or less, repair short in affected circuit. - 7) For KOEO & KOER Only DTC P0193: Check FRP V PID Value
This DTC indicates FRP voltage fell below a minimum calibrated limit and a calibrated minimum amount of time during Comprehensive Component Monitor (CCM). Possible causes for this fault are:- FRP Signal Shorted To VREF Or VPWR
- FRP Signal Open (Gasoline Only)
- Low Fuel Pressure (NGV Only)
- Faulty FRP Sensor
- Faulty PCM
- High Fuel Pressure (Possible Faulty Fuel Pressure Regulator - NGV Only)
Turn ignition switch to ON position. Using scan tool, access FRP V PID from PID/DATA MONITOR & RECORD menu. FRP V PID voltage should be more than 4.5 volts on natural gas vehicles, and more than 4.8 volts on gasoline vehicles. If FRP V PID voltage is as specified, go to next step (gasoline vehicles), and step 9) (natural gas vehicles). If FRP V PID voltage is not as specified, fault may be intermittent. Go to step 14).
- 8) Check FRP Sensor For Fuel Leaks
Turn ignition switch to OFF position. Remove vacuum hose from FRP sensor. Inspect sensor and vacuum hose for fuel. If any fuel is present, replace FRP sensor. If no fuel is present, go to step 10). - 9) Check Fuel Pressure (Natural Gas Vehicles)
Start engine. Using scan tool, access FRP V PID from PID/DATA MONITOR & RECORD menu and monitor pressure. If fuel pressure is more than 150 psi (1034 kPa), go to TEST HB, step 1) . If fuel pressure is 150 psi (1034 kPa) or less, go to next step. - 10) Simulate Opposite FRP Signal To PCM
Turn ignition switch to OFF position. Disconnect FRP sensor connector. Connect jumper wire between FRP and SIG RTN terminals at FRP sensor harness connector. See Fig 1 or Fig 2 . Turn ignition switch to ON position. Using scan tool, access FRP V PID from PID/DATA MONITOR & RECORD menu.NOTE: If a scan tool communication concern exists, remove jumper wire and go to step 24).If FRP V PID voltage is less than .2 volt, replace FRP sensor. If FRP V PID voltage is .2 volt or more, go to step 12).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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