Question about 2004 Chevrolet Silverado 2500HD
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Posted on Jan 02, 2017
Posted on Nov 05, 2008
Fuel Rail Pressure Low During Power Enrichment
The engine control module (ECM) uses the fuel rail pressure (FRP) sensor to determine fuel pressure to the fuel injectors. This is then compared to the calculated target fuel pressure as determined by the ECM. The ECM adjusts the FRP by modulating the duty cycle of the control driver of the fuel pressure regulator. Injector pulse duration is determined by the measured rail pressure and the target injection fuel into each cylinder. If a sensor circuit malfunction is detected, or the commanded fuel injection pump flow is not within the proper range for a given engine load and speed, DTCs will be set.
DTC U1000 and U1255 Circuit Description Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within about five seconds of beginning serial data communication, DTC U1000 or U1255 is set. When more than one critical parameter does not have an identification number associated with it, the DTC will only be reported once. The class 2 serial data line on this vehicle is a ring/star configuration. The following modules communicate on the class 2 serial data line:
• The body control module (BCM) • The digital radio reciever • The driver door module (DDM) • The electronic brake control module (EBCM) • The front passenger door module (FPDM) • The HVAC control module • The inflatable restraint sensing and diagnostic module (SDM) • The instrument panel cluster (IPC) • The memory seat module (MSM) • The powertrain control module (PCM) • The radio • The radio amplifier • The rear seat audio (RSA) controller • The rear seat entertainment (RSE) assembly w/U42 • The rear wheel steering control module • The remote playback device-CD player w/U1S • The transfer case shift control module • The transmission control module (TCM) w/Allison transmission • The theft deterrent control module • The vehicle communication interface module (VCIM) w/UE1
Posted on Dec 09, 2008
Have a friend, (or in-law) someone you're not too fond of, stand in front of the truck while you honk the horn and have them pinpoint it for you.
Posted on Dec 29, 2008
The requirement is 10 QTS. I use 10 and check it cause some times they hold 11 QTS. I hope this helps. If you have more questions reguarding this or other conserns please ask me. Please remember high ratings are very important to me.
Posted on Aug 28, 2009
Testimonial: "Thanks very much for that Regards Bryan McRae New Zealand"
This problem is directly related to the APP (Accelerator Pedal Position) Sensor and the associated Module located on the Firewall immediately to the Left side of the Power brake booster unit. Disconnect the Negative Battery Cable before doing anything else! The Gray Connector is the one closest to the Left Front Fender. All of the leads to this connector are associated with the Accelerator Pedal Position Sensors and many other circuits controlling the electronics which operate the Air Valve Butterfly located on the front of the Intake Plenum. Corrosion of the contacts in the Gray Connector is common. Carefully clean the contacts, re-assemble the connector, re-connect the Negative Battery Cable and start the engine. If the problem is gone you should be home free. Another cause is Squirrels or Chipmunks eating through the insulation of the wires inside the Plastic Wire Loom. In my case this was what happened and I had to splice 6 of the wires which had been eaten through and broken. There are numerous Factory Service Bulletins covering related problems including a Program Update of the ECM.
Posted on Apr 26, 2010
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