Question about 1998 Chevrolet Express
P0193 ON THIS CNG VAN(GAS)HAS BEEN SHOOTING OUT THIS CODE AFTER IT'S BEEN CLEARED,SO IT'S CONSTANT! ACORDING TO THE FLOW CHARTS OF ALL DATA! IT'S EITHER THE FRP SENSOR OR THE PCM! WELL! I REPLACED THEM BOTH ALL READY AND HAD THE PCM REFLASHED ALREADY,BUT THE CODE P0193 STILL KEEPS COMING UP CAUSING THE ENGING TO SERG,ANY HELP?
P0193 - Fuel injector supply Rail Pressure Sensor Circuit High Input
Possible causes- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel Pump
P0193 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.
Posted on Oct 26, 2012
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Posted on Jan 02, 2017
So is your ABS light on? Computer won't hold a code for the ABS light. There's 4 sensors one at the back of each wheel one of them is bad. As longs as your brakes are working normally you can at your time to fix it. ABS was made for panic stops only thats why the pedal pumps fast when you stop hard.
Posted on May 27, 2009
take about 20 minutes if you have to tools handy. You have 4 02 sensors so be sure to have the tech tell you which one.
Posted on Nov 26, 2009
could be two things, 1; the coil is going bad. 2; the electronic egr valve has a piece of carbon in it. the latter is probably the problem. to fix this , just remove the valve, push on the piston and while holding it in the open position, spray with carb cleaner and blow it out, release the piston and be sure the valve is closing all the way. if the gasket is damaged you can get a new one at the parts store.
Posted on Dec 18, 2009
SOURCE: I own a 2006 impala
I read over the p0481 code, and someone else had a problem with this circuit in a 2003 Impala.
OK, if replacing the relay and fan motors and checked fuses and replaced coolant temperature sensor, there isn't much left to check but the harness which means that a wire could be crossed or open to the circuit causing an immediate code to come back on after clearing it.
Maybe, if it's too hard to trace yourself ( wiring can be like tracing a break in spaghetti), then try to take it to an auto electric shop to have them chase the wire for you that is bad or crossed.
If the scanner communicates with the ECU/PCM then it's likely it's ok. But, I've seen some ECU/PCM units with partial functionality with fuel injectors, not firing, for instance.
Good luck on this repair.
Posted on Feb 03, 2011
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