PRE-RELEASE
DTC P0192 or P0193
| DTC P0192 or P0193 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0192 12
Fuel Rail Pressure Sensor Circuit Low Voltage
DTC P0192 5A
Fuel Rail Pressure Sensor Circuit Low Voltage
DTC P0193 11
Fuel Rail Pressure Sensor Circuit High Voltage
DTC P0193 5B
Fuel Rail Pressure Sensor Circuit High Voltage
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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5V Reference
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P0651 00
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P0192 5A, P0192 12
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P0651 00
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-
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Signal
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P0192 5A, P0192 12
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P0192 5A, P0192 12
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P0193 11, P0193 5B
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P0194 00
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Low Reference
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P0192 5A, P0192 12
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P0192 5A, P0192 12
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-
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| Typical Scan Tool Data |
Fuel Rail Pressure Sensor
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine Running
Parameter Normal Range: 0.5-4.8 V |
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5V Reference
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5 V
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5 V
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-
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Signal
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0 V
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5 V
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5 V
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Low Reference
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-
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5 V
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-
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| Circuit/System Description |
The fuel rail pressure sensor measures the fuel pressure within the fuel rail. The engine control module (ECM) monitors the voltage on the fuel rail pressure sensor circuits. When the fuel pressure is low, the signal voltage is low. When the fuel pressure is high, the signal voltage is high. The ECM supplies 5 V to the 5 V reference circuit and a ground to the low reference circuit. The fuel rail pressure sensor provides a signal voltage to the ECM, relative to the pressure changes within the fuel rail, on the fuel rail pressure sensor signal circuit.
| Conditions for Running the DTC |
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The engine is running.
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The DTCs run continuously when the above conditions are met.
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| Conditions for Setting the DTC |
P0192 5A or P0192 12
The ECM detects that the fuel pressure sensor voltage is less than 0.254 V for 0.5 s.P0193 5B or P0193 121
The ECM detects that the fuel pressure sensor voltage is greater than 4.7 V for 0.5 s.P0194 00
The ECM detects that the fuel pressure sensor signal is not plausible.| Action Taken When the DTC Sets |
DTCs P0192 11, P0192 5A, P0193 11, P0193 5B, and P0194 are Type B DTCs.
| Conditions for Clearing the DTC |
DTCs P0192 11, P0192 5A, P0193 11, P0193 5B, and P0194 are Type B DTCs.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel System Description
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
| Circuit/System Verification |
| 1. |
Ignition On, observe the DTC information with a scan tool. Verify that DTCs P0651 is not set.
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| 2. |
If the DTC is set, refer to
DTC P0651
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| 3. |
Observe the scan tool Fuel Rail Pressure Sensor voltage parameter. The reading should be between 0.4-4.5 V.
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| 4. |
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the B47 Fuel Pressure Sensor.
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| 2. |
Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 1 and ground.
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| 3. |
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 4. |
Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
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| 5. |
If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 6. |
If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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| 7. |
Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.8 V.
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| 8. |
If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
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| 9. |
Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.3 V.
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| 10. |
If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 11. |
If all circuits test normal, test or replace the B47 Fuel Pressure Sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement
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Control Module References
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