Circuit Description
The engine control module (ECM) monitors the fuel rail pressure (FRP) via a FRP sensor. When the FRP is high, the signal voltage is high. When the FRP is low, the signal voltage is low. If the fuel rail pressure is above the upper limit for the sensor, DTC P0193 will set.
DTC Descriptor
This diagnostic supports the following DTC:
DTC P0193 Fuel Rail Pressure (FRP) Sensor Circuit High Voltage
Conditions for Running the DTC
| • | DTC P0642 or P0643 is not set. |
| • | The ignition is ON. |
| • | The system is not in Powerdown mode. |
Conditions for Setting the DTC
The ECM detects the signal circuit is more than 175 MPa.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. |
| • | The control module limits fuel injection and FRP. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | |
2 | Are DTCs P0642 or P0643 set? | -- | Go to Step 3 | |
3 |
Did the DTC fail this ignition? | Go to Step 4 | Go to Intermittent Conditions | |
4 |
Is the Actual Fuel Rail Pressure within the specified range? | 1.0-1.8 MPa | Go to Step 6 | Go to Step 5 |
5 |
Does the voltage measure near the specified value? | 5 V | Go to Step 7 | Go to Step 6 |
6 |
Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 |
7 |
Is the current more than the specified value? | 5 V | Go to Step 10 | Go to Step 8 |
8 |
Is the resistance less than the specified value? | 5 ohms | Go to Step 9 | Go to Step 12 |
9 |
Is the Actual FRP parameter at the specified value? | 0.0 MPa | Go to Step 13 | Go to Step 11 |
10 | Test for a short to voltage in the FRP sensor signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 16 |
11 | Test the signal circuit of the FRP sensor for a high resistance or an open. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you Find and correct the condition? | -- | Go to Step 17 | Go to Step 14 |
12 |
Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 |
13 | Test for an intermittent and for a poor connection at the FRP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 15 |
14 | Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 16 |
15 | Replace the FRP sensor. Refer to Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement . Did you complete the replacement? | -- | Go to Step 17 | -- |
16 | Replace the ECM. Refer to Engine Control Module Replacement . Did you complete the replacement? | -- | Go to Step 17 | -- |
17 |
Did the DTC fail this ignition? | -- | Go to Step 3 | Go to Step 18 |
18 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |
