It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter jrbaldwin Start date Apr 22, Nov 5, 19 Washington. No starter signal at starter relay but when jump relay will turn over but not start. No check engine light. When leave key in on position for a while security lights come on Dash lights, head light, heater, radio, turn signal, windows, wipers and everthing seems to work.
Normal code reader cannot comunicate with or read codes. Snap-On scanner can read codes but only recognizes 10 systems and 8 codes with cleared and return. Snap-On scanner can run run function test of lights, windows, power down, ect in Bode Control Module. All fuses in both fuse boxes look good. Reconized Modules 1. Anti-lock Brakes - 0 codes 2.
Door Module - Drive - 0 codes 5. Instrument Panel Cluster - 0 codes 7. Lift Gate - 0codes 8. Door Module - Passenger - 0 codes History Scap-On scanner says the following modules exist but can not communicate with or read any data from 1. Engine 2. Radio - Aftermarket 3. Seat module - driver 4. Theft Deterrent 5. Transmission Past History Has a occasional starting issue where would not start unless disconnected battery for 10 minutes then would start properly again for a week or two.
No codes found with normal code reader. Talked to Chevy Dealer who said needed to be towed in while in no start condition to read codes and diagnosis. Had spare BCM and had dealer program to car. Need a step by step test to identify the electrical serial buss issue causes or eliminate possible causes.
Searched but not much information found other than disconnect modules one at a time to check if one is going bad and corrupting the serial bus. Thinking first step is to test all fuses with multi-meter. Then inspecting all wiring in engine compartment for mouse damage. Had a mouse build nest under air cleaner and chew thru some injection wiring last year. Thanks, Jim. Last edited: Apr 22, Chickenhawk Hobbyist. Dec 6, Have you replaced your ignition switch yet?
Yes changed about months ago. Carry a spare so will change to eliminate as a possible issue. Jun 16, 1, kanata. Your best bet would be to check all fuses with a meter as opposed to your eyes Also pulled and looked at fuse elements which looked good.
Going to check each fuse with multi-meter. Can check voltages with fuses in place as have small test pads on top. Can check both sides on the fuses for voltages. Want to do things in an step by step manner keeping a check list of completed items. Sorry out getting lag bolts to secure the wifes new green house. Yes no "check engine light" with the key turned on but comes on during the "all lights test" at the start of "key on" sequence.
But will check again to confirm all lights test. Yes all instrument cluster warning lights on during "all lights test" at the start of "key on" sequence. DocBrown Hobbyist. Dec 8, First thing, start with the basics. Test your battery. After sitting for at least 10 minutes, it should be showing Any less and you probably need a new battery. Also check the voltage at the starter.
And make sure the cables are on tight. I did that over the winter, my Sierra wouldn't start and I started troubleshooting everything else. The cause was a slightly loose negative battery cable.
Cleaned it, tightened it, and all is well. Click to expand So makes sense to start with the PCM as it is one of the 4 modules the scanner can not communicate with.
A couple of months ago found a mouse nest almost on top of the PCM. Note that code U on Nissan applications is a Class 2 communication malfunction, and therefore may or may not be accompanied by other generic or Nissan specific codes that identify at least the area in the CAN system where the fault occurred. All modern vehicles are equipped with a CAN Controller Area Network serial communication system that interconnects all the control modules on the vehicle.
All CAN bus systems consist of two interdependent circuits, one being the Can High circuit, and the other being the Can Low circuit, which allows not only for increased communication efficiencies, but also for increased fault detection capability.
However, and as a practical matter, while all control modules on a CAN bus system can transmit and receive data some types of data carry a higher priority than other types of data. This is so because some faults are more serious than other faults, which means that data is exchanged between control modules on a strictly maintained priority basis, with higher priority data always enjoying priority over data with a lower priority.
However, the trouble with this code is that it is not always accompanied by other codes that identify the area or system in which the communication failure had occurred, which can make it very difficult to isolate the communication failure.
In practice though, if there are no additional codes present, there are often also no symptoms present, apart from a stored trouble code. However, if other codes are present, the symptoms are often related to the codes, although some symptoms that might be present are often nebulous, in the sense that there is often no clearly discernible connection between the symptoms and the additional codes. Typical examples of this might be a hard, or no start condition, frequent, and unpredictable engine stalling, fluctuating idling speed, and varying degrees of power loss, when no codes that are directly indicative of these issues are present.
I would recommend having an expert, such as one from YourMechanic come to What is cause of yaw sensor malfunction I'll agree with the shop on this one. It has a Fuel regulator 0 psi. If the motor is running, there can't be 0 psi. I'm not sure how you are reading fuel pressure from the regulator. This is not a normal diagnostic procedure.
Maybe you are referring to a fuel pressure gauge. And again, How to display outside tempeture on doc of tahoe Hi Bryan. Thanks for writing in tonight. You should have been provided with an owner manual when purchasing your new Tahoe. The instructions for completing this task should be listed in the manual.
If you don't have a manual for Problem with RPM What you are describing sounds like a dirty or failing idle air control valve.
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