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  1. R

    LML P0103 (MAF High Frequency)

    Good news!
  2. R

    LML P0103 (MAF High Frequency)

    If you have access to a scope, you could monitor the input and output of the MAF signal to see when it's happening and see if it is a spike or constant or ??? Backprobe the connector and test under running conditions. P103, at least for my 2008 LMM, says the output is: "The ECM detects that the...
  3. R

    LML P0103 (MAF High Frequency)

    1st thing to do is to make sure you have your 5V ref and low ref coming into the sensor. OEM sensors are the best, but others sometimes get the job done too. I take it the P0103 is the only code you have? If so, there are several possibilities for that one. These sheets pertain specifically to...
  4. R

    Lost the motor?

    You can buy a USB borescope camera to attach to a computer for $25 or less. Very handy for lots of things. Make sure you buy one that has a head small enough to fit into the glow plug hole opening.
  5. R

    ABS kicking in

    What codes are present on your truck? Any modules that you cannot communicate with, based on a scan tool plugged into the DLC (diagnostic link connector)?
  6. R

    Still having trouble, need recomendations

    I wondered why the 2003 and BYD wiring diagram from GMUPFITTER didn't have a separate diagram for the LBZs included. Sometimes you just don't know what you don't know. Thanks for the help.
  7. R

    Still having trouble, need recomendations

    I wouldn't be too quick to condemn the ECM as the source of the problems. The ECM pulls the signal voltage down at the FICM (same as EDU in the wiring diagrams) and the EDU connects to the injectors via the wiring harness. Since you have a good balance (good injector firing) while the engine...
  8. R

    Battery Not Charging

    I would not think of testing that wire/connector unless the output to the battery cable terminal was incorrect. Battery cable should be about 14V while at idle for a fully charged battery, sometimes more if the battery is depleted. And the battery should output the stated AMPS, or at least close...
  9. R

    Still having trouble, need recomendations

    And both of those are in the same group. Surprise, surprise.
  10. R

    Still having trouble, need recomendations

    See attached from my 2008 LMM
  11. R

    Noob to the duramax

    See here: https://www.dtcdecode.com/Chevrolet/P0201 Looks like there is a faulty connection to the injector for cyl #1. Try unplugging and then re-glugging the connector, use some DeOxit if you have that, or tuner cleaner, or electrical contact cleaner, etc.
  12. R

    ABS kicking in

    All electrical devices need sound circuits in order to function correctly. Make sure you check the circuit.
  13. R

    Clock spring replacement?

    From what you have said, it's not the clockspring. Change the brake switch and see if your problems are solved.
  14. R

    Battling P0101 on LMM

    Lots of possibilities on the attachment
  15. R

    Bad ECM?

    Post #5 is likely your solution. Some part of the circuit is open or grounded.
  16. R

    Bad ECM?

    See here: https://www.dtcdecode.com/Chevrolet/P0045
  17. R

    Bad ECM?

    Are you doing your testing with the engine running? Think about what the FRP actually does and what it would take to make it work that way. If it was supplied with the same voltage all the time, it would regulate to the same pressure all the time. So the voltage must be varied to regulate...
  18. R

    LMM: ECM P2510 ECM Relay code HELP!!

    Relays are pretty cheap, so you could 'fire the parts shotgun', replace the PWR/TRN relay, and maybe your problem will be fixed. If not the relay, you need to do the testing to see if the CIRCUT is bad or that the ECM is bad. Just reading from what I posted a few years back.
  19. R

    LMM stand alone fail

    Zip ties work. May need more than 1.
  20. R

    Coolant and fuel temp reading negative

    Concentrate on this solution.
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