DTC P0192 or P0193
Diagnostic Instructions
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
|
5V Reference
|
P0651 00
|
P0192 5A, P0192 12
|
P0651 00
|
-
|
Signal
|
P0192 5A, P0192 12
|
P0192 5A, P0192 12
|
P0193 11, P0193 5B
|
P0194 00
|
Low Reference
|
P0192 5A, P0192 12
|
P0192 5A, P0192 12
|
-
|
-
|
|
| |
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
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 11
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 P0192 12, P0192 5A, P0193 11, and P0193 5B are Type B
DTCs.
Conditions for Clearing the DTC
DTCs P0192 12, P0192 5A, P0193 11, and P0193 5B 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
| 1. |
Ignition On, observe the DTC
information with a scan tool. Verify that DTC P0651 is not
set. |
| ⇒ |
If the DTC is set, refer to
DTC P0651 for further diagnosis. |
| 2. |
Observe the scan tool Fuel
Rail Pressure Sensor voltage parameter. The reading should be
between 0.4-4.5 V. |
| 3. |
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
| 1. |
Ignition OFF, disconnect the
harness connector at the B47B Fuel Rail Pressure Sensor.
|
| 2. |
Ignition OFF, test for less
than 5 Ω between the low reference circuit terminal 1 and
earth. |
| ⇒ |
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. |
| 3. |
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. |
| 4. |
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. |
| 5. |
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. |
| ⇒ |
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. |
| 6. |
If all circuits test normal,
test or replace the B47B Fuel Rail Pressure Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
