AutoCodes - Isuzu - P0191 ISUZU

P0191 ISUZU Code - Fuel Rail Pressure Sensor Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|P0191 ISUZU code possible causes

  • High fuel pressure
  • Low fuel pressure
  • Damaged FRP sensor
  • Excessive resistance in the circuit
  • Low or no fuel
  • Wiring harness connector of the fuel pressure sensor
  • Fuel Rail Pressure Sensor
  • Vacuum leaks
  • Fuel

|How do I fix the P0191 ISUZU code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Cost of diagnosing the P0191 ISUZU code

Labor: 1.0

The cost of diagnosing the P0191 ISUZU code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0191 ISUZU code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine will not start

|P0191 ISUZU code description

The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.
Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.
OBDII Code P0191 Isuzu - Fuel Rail Pressure Sensor Performance - AutoCodes.com

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|P0191 ISUZU code comments

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Repair Importance Level: 3
 
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