How does fuel timing work in an ECM?
Fuel timing can be advanced by as much as 25° BTDC (before top dead center), when measured from the crankshaft. The ECM uses fuel pressure readings to modulate fuel pressure, via the fuel pressure regulator, as well as to monitor the function of the fuel pump itself.
What does the p0087 code on the fuel rail mean?
A sensor on the fuel rail measures fuel pressure. It will warn the PCM if the pressure falls below the level expected of the fuel pump driver module or fuel pump assembly’s current activity. In response, the PCM may log the P0087 code.
How is fuel pump timing related to engine speed?
This type of fuel pump is very compact, including both low- and high-pressure pumps and fuel pressure regulating device. Injection pump timing and pressure is directly related to engine speed because it is driven by the timing chain, so there must be a way to advance injection timing.
What does the sensor on the fuel rail do?
The purpose of this sensor is to keep track of the fuel pressure within the fuel rail. As the sensor detects this information, the data gets transmitted to the engine control unit.
Why was the fuel rail pressure sensor developed?
1) The only reason why the Fuel Rail Pressure Sensor was developed was to make the Fuel-Pump last longer. 2) Before the Fuel Rail Pressure Sensor was developed, the fuel pump was always woking at 100% load. 3) Using the Fuel Rail Pressure Sensor, the fuel pump module regulates the pump’s rotational speed, according to engine load.
What are the OBD codes for Duramax trucks?
07 duramax cab & chassis, throwing codes; po087,po128, po672,po673,po676,po671…the main concern is the po087 code.trouble diagnosing the problem. w/o scan tool narrowed down to cp3 fuel pump/ or small outside chance of the rail pressure sensor faulty.truck has 135,200miles…
How does a returnless fuel rail system work?
Some vehicles are equipped with a returnless fuel supply, this means that the fuel pump is pulse width modulated and can vary in pump speed to deliver fuel to the rail at a variable rate instead of constantly running the fuel pump and regulating the pressure with a pressure regulator, returning fuel back to the tank.
What is the diagnostic code for OBDII engine?
This generic powertrain/engine diagnostic trouble code typically applies to all OBDII equipped vehicles.