• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5 V Reference Voltage | P0193, P0642 | P0193 | P0193, P0643 | P0191 |
FRP Sensor Signal | P0192 | P0193 | P0193 | P0191 |
Low Reference | -- | P0193 | P0193, P0643 | P0191 |
The fuel rail pressure (FRP) sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5-volt reference voltage on the 5-volt reference circuit and ground on the reference ground circuit. The ECM receives a varying signal voltage on the signal circuit. The ECM monitors the voltage on the FRP sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure is low, the signal voltage is low.
• | The ignition is ON or the engine is running. |
• | The DTCs run continuously within the enabling conditions. |
The ECM detects that the signal circuit voltage is less than 0.3 volt for greater than 4 seconds.
The ECM detects that the signal circuit voltage is greater than 4.7 volts for greater than 4 seconds.
• | DTCs P0192 and P0193 are Type A DTCs. |
• | A message center or an indicator may display Reduced Engine Power. |
DTCs P0192 and P0193 are Type A DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699. |
Note: Testing for steps 3 through 7 is performed on the ECM side of the multi-way harness connector.
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified value, test the signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If the parameter does not transition from the maximum to minimum value, test the signal circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the ECM. |
Note: Testing for steps 11 through 15 are performed at the FRP sensor connector.
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified value, test the signal circuit terminal 2 for a short to ground. |
⇒ | If the parameter does not transition from the maximum to the minimum value, test the signal circuit for an open/high resistance or a short to voltage. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |
• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5-Volt Reference | P0641 | P0641, P06A6 | P0641 | P06A6 |
Fuel Rail Pressure (FRP) Sensor Signal | P0192 | P0191, P0192 | P0193 | P0191 |
Fuel Line Pressure Sensor Low Reference | -- | P0641, P06A6 | -- | P06A6 |
The fuel pressure sensor is mounted on the fuel line. Fuel pressure is measured by the fuel pressure sensor. The fuel pump flow control module (FPCM) monitors the voltage signal from the fuel pressure sensor and also supplies the voltage and the ground of the fuel pressure sensor.
The ignition is on.
The FPCM detects that the fuel rail pressure (FRP) sensor signal circuit is above 4.9V or below 0.1V.
DTCs P0192 and P0193 are Type A DTCs.
DTCs P0192 and P0193 are Type A DTCs.
Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the FPCM. |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FPCM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the FPCM. |
⇒ | If less than the specified range, test the signal circuit terminal 1 for a short to ground or an open/high resistance. If the circuit tests normal, replace the FPCM. |
⇒ | If greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the FPCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for FPCM replacement, setup, and programming |