DTC P0191, P0192, or P0193 - LPL or LPV
Diagnostic Instructions
DTC Descriptors
DTC P0191 00: Fuel Rail Pressure Sensor
Performance
DTC P0192 00: Fuel Rail Pressure Sensor
Circuit Low Voltage
DTC P0193 00: Fuel Rail Pressure Sensor
Circuit High Voltage
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
5V Reference
|
P0652 00
|
P0192 00
|
P0653 00
|
-
|
Signal
|
P0192 00
|
P0192 00
|
P0193 00
|
P0191 00
|
Low Reference
|
P0192 00
|
P0192 00
|
-
|
-
|
Typical Scan Tool Data
Fuel Rail Pressure Sensor
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: Engine
running
Parameter Normal Range:
0.5-4.8 V
|
5V Reference
|
5 V
|
5 V
|
-
|
Signal
|
0 V
|
5 V
|
5 V
|
Low Reference
|
-
|
5 V
|
-
|
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
• |
The DTCs run continuously when the above
conditions are met. |
Conditions for Setting the DTC
P0191 00
The ECM detects that the fuel pressure sensor signal is not
plausible.
P0192 00
The ECM detects that the fuel pressure sensor voltage is less
than 0.254 V for 0.5 s.
P0193 00
The ECM detects that the fuel pressure sensor voltage is greater
than 4.7 V for 0.5 s.
Action Taken When the DTC Sets
DTCs P0191 00, P0192 00, and P0193 00 are
Type B DTCs.
Conditions for Clearing the DTC
DTCs P0191 00, P0192 00, and P0193 00 are
Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition On, observe the DTC information with a scan
tool. Verify that DTC P0651 is not set.
- Observe the scan tool Fuel Rail Pressure Sensor
voltage parameter. The reading should be between
0.4-4.5 V.
- 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.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the
B47 Fuel Pressure Sensor.
- Ignition OFF, test for less than 5 Ω between the
low reference circuit terminal 1 and ground.
⇒ |
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. |
- Ignition ON, test for 4.8-5.2 V between the
5 V reference circuit terminal 3 and ground.
⇒ |
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. |
⇒ |
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. |
- Verify the scan tool Fuel Rail Pressure Sensor voltage
parameter is greater than 4.8 V.
⇒ |
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. |
- Install a 3A 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.
⇒ |
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. |
- If all circuits test normal, test or replace the
B47 Fuel Pressure Sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|