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  1. T

    Help Troubleshooting Fuel Trims

    Maybe so, but an hour of driving in one fuel trim cell is not what you are going to read at idle later in a different fuel trim cell. I think knowing what trim cells are higher and what trim cells are lower can sometimes help to narrow down the possibilities.
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    Help Troubleshooting Fuel Trims

    Are you able to read which long term fuel trim cells are at that 25%
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    Help blower motor

    @jamison2021 Look here at the upper right of schematic #2. The BLOWER fuse in the underhood fuse block is for fan speed 5 ONLY. Shows a 40 amp fuse. Make sure that's OK...
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    Are the locks the same?

    Mechanic friend of mine years ago said to put in something that doesn't kill the fuel pump until like 5 or 10 minutes later. This way the vehicle dies unexpectedly in the middle of the road somewhere and the theif is less inclined to hang around trying to get it to restart !!
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    Are the locks the same?

    Just for curiosity,, how is the Passlock system overcome? Guess it could be be not started and just dragged off?
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    TPMS Problems

    Seems unlikely that a radio would do it,,, at least I haven't heard of such a thing.
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    TPMS Problems

    Can you think of anything that may be causing radio frequency interference? I think I have read that some aftermarket LED lighting might do this... maybe?? I don't know myself.
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    TPMS Problems

    Hell, the sensor ID ##s can be read out (and written in) with a $15 Bluetooth OBD2 adapter!!
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    TPMS Problems

    All tire pressures are sent together in a single message from the PDM that the cluster receives. So it is not likely to be something like a wiring issue or all sensors would drop out together. The messages are sent quite frequently as seen here in a screenshot of a search of a logfile I have...
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    TPMS Problems

    at least for my own 2005 Yukon the TPMS system is in the PDM (passenger door module). That's also the module that receives the radio frequency signals from the key fobs.
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    Intermittent Serial Data Problem

    Well, feel free to give a shout out if you need. Here's a little look at the sort of stuff I do with a $15 OBD2 adapter.. This is what J1850VPW serial data actually looks like. Ever heard of SOH (state of health) messages? There's at least 10 or more of them here among the normal...
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    2006 Chevy Tahoe Z71 TPMS Problems

    Does the scantool read out battery levels and such for the sensors?
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    Intermittent Serial Data Problem

    Any chance you own one of those inexpensive Bluetooth (or WiFi) OBD2 adapters? You can actually do a crapload of useful stuff with those IF you know how or have some guidance. I have spent an absurd amount of time studying all sorts of SAE J1850 VPW serial data stuff. Mostly on my 02...
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    Spare Tire Pressure Sensor

    I have an 05 Yukon. I might try writing in a sensor number to see if that makes it toss a code or set the light on when nothing reports.
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    2004 yukon security light staying on

    Verify your grounds? Especially G103 which is the main ground for the PCM. https://charm.li/GMC/2004/Yukon%2FDenali%204WD%20V8-5.3L%20VIN%20T/Repair%20and%20Diagnosis/Power%20and%20Ground%20Distribution/Diagrams/Electrical%20Diagrams/Ground%20Distribution%20Diagrams/Grounds%20By%20Number/G103/...
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    2004 yukon security light staying on

    Are you able to read anything at all from the ECM/PCM with your scan tool?
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    2004 yukon security light staying on

    This right here sounds to me like there is no class 2 serial data from the PCM.
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    2004 yukon security light staying on

    Did you use your existing PCM or the PCM from the donor engine?
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    2000 GMC Yukon wire diagram

    Here are several... https://charm.li/GMC/2000/
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    TPMS and Torque app

    From what I can tell your GMT900 has no Class II data so that about eliminates me from being of any assistance.
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    TPMS and Torque app

    And here is another twist.... If your IPC uses the Class 2 J1850VPW bus, in Torque Pro you can ask for the data without even using a "true PID" in the usual sense. It is possible to use Class 2 communications as defined in SAE J2178. So there you can likely get the "range position" that is...
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    TPMS and Torque app

    I am fairly well versed in the older pre-CAN system(s). Don't know doodley-squat about CANBUS. I don't believe the "01" I add to PIDs applies to CANBUS ISO 15765-4 vehicles. But maybe GM uses the same PID ## for both? With the older Class 2 serial bus J1850VPW vehicles the common PID is 199A...
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    TPMS and Torque app

    Realize I am late to the question here. I have been away from the forum for a while. Anyway, try adding "01" to the end of the mode&pid you show. So the one you pictured becomes 22249101. An "01" seems to be required a lot of the times when a PID gets no response or a "7F...." response. If...
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    How do thieves circumvent the passlock theft deterrent?

    I agree, I don't spend a lot of time on the grade school level relays and switches these days. My current project is an Arduino that reads all messages on the serial data bus and I can choose any given message to trigger any given action that a Tech 2 could do in response, short of...
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    How do thieves circumvent the passlock theft deterrent?

    Getting back on topic, just in case anyone is interested. Circled here is the actual resistor on an actual passlock sensor circuit board that varies from vehicle to vehicle and produces the variable voltage drop that the BCM sees and evaluates. The component with the blue dot is the...

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