2010 Cadillac Truck SRX FWD V6-3.0L Page 1254
瀚慖f greater than the specified value, test the signal circuit for a short to voltage.
16. Connect a 3 A fused jumper wire between the signal circuit terminal B and the 5 V reference circuit terminal A. Verify the scan tool Fuel
Rail Pressure Sensor voltage parameter is greater than 4.96 V.
瀚慖f less than the specified value, test the signal circuit for an open/high resistance or a short to ground.
17. If all circuits test normal, replace the B47 fuel rail fuel pressure sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pressure
Sensor/Switch/Service and Repair/Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0192
DTC P0192 or P0193 (LF1)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0192
- Fuel Rail Pressure Sensor Circuit Low Voltage
DTC P0193
- Fuel Rail Pressure Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The fuel rail fuel pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on
the 5 V 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 fuel rail fuel pressure sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure
is low, the signal voltage is low.
Conditions for Running the DTC
* The engine is running.
* The ignition voltage is between 11-18 V.
* The DTCs run continuously within the enabling conditions.
Conditions for Setting the DTC
P0192
The ECM detects that the fuel rail fuel pressure sensor signal voltage is low.
