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Thread: Transmission Temperature ECU Input

  1. #1
    Join Date
    Dec 2009
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    Default Transmission Temperature ECU Input

    Those of you with the Holley Avenger, HP or Dominator EFI system may be interested in this. I added a transmission fluid temperature sensor Input to my ECU. A coolant temperature sensor is too big & bulky, and 3/8-18 NPT threads are too coarse for sealing in thin wall aluminum castings. So I contacted Auto Meter's Tech Department and had a nice discussion about what I was doing. He recommended their #2259 temperature sending unit (1/8-27 NPT) because it's very compact and will fit in shallow depth ports. He said it's their newer model sending unit (for coolant/cylinder head temperature, transmission fluid, engine oil, gear oil, etc.) and more accurate than their older ones. It's also self-grounding, so it's an easy one wire hookup. Best of all, it's only $16. I installed it in my transmission's main line pressure test port. No gauge required because I'm monitoring it on the ECU Data Monitor, Datalogger, TSLCD/Digital Dash. It works very well and I'm happy with the easy installation. Here's the 16 thermistor calibration data points I acquired to enter into our ECU "Custom Thermistor" Input.

    Auto Meter 2259 Thermistor Specifications
    Temperature = Ohms (Holley EFI 16 Cell Calibration Table):
    100F = 1123Ω 102Ω (Right)
    120F = 708Ω 59Ω
    140F = 460Ω 35Ω
    150F = 374Ω 27Ω
    170F = 253Ω 17Ω
    190F = 175Ω 10Ω
    200F = 149Ω 8Ω (I mathematically averaged this in, for 16 data points.)
    210F = 123Ω 7Ω
    212F = 119Ω 6Ω
    220F = 105Ω 5Ω
    230F = 89Ω 5Ω
    250F = 65Ω 4Ω
    280F = 42Ω 3Ω
    300F = 32Ω 2Ω
    320F = 25Ω 2Ω
    340F = 20Ω 1Ω (Left)
    http://www.autometer.com/shallow-dep...d-340-deg.html (1/8-27 NPT)
    http://www.summitracing.com/parts/ATM-2259/ ($16)


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    Auto Meter 2253 Thermistor Specifications
    Temperature = Ohms (Holley EFI 16 Cell Calibration Table):
    60F = 1200Ω (Right)
    80F = 827Ω
    100F = 453Ω
    130F = 292Ω
    160F = 130Ω
    175F = 103Ω
    190F = 76Ω
    198F = 69Ω
    205F = 62Ω
    213F = 55Ω
    220F = 47Ω
    230F = 41Ω
    240F = 34Ω
    260F = 27Ω
    280F = 19Ω
    315F = 14Ω (Left)
    https://www.autometer.com/sender-for...d-340-deg.html (1/8-27 NPT)
    https://www.summitracing.com/parts/atm-2253 ($16)


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    I also acquired information on the only other popular temperature sending unit
    Auto Meter recommends - #2252 ($27). It's a two wire thermistor (1/8-27 NPT).
    Delphi Metri-Pack mating connector ~ 12047662 & TPA lock ~ 12047664
    Delphi Metri-Pack terminals ~ 12047767 .039"-.031" & 12064971 .020"-.014"
    It's actually a Delphi 12160855 sensor and I included the calibration data below.

    Select a 31 data point field, not 32. 32 would leave one off the scale.
    16 cell values + an additional value in between each pair of cells = 31.
    The scale should be configured from 302F (189Ω) to 32F (37499Ω).
    The temperature scale is linear, but the Ohms resistance scale is not.

    Auto Meter 2252 (Delphi 12160855) Thermistor Specifications
    Temperature = Ohms (Holley EFI 16 Cell Calibration Table):
    32F = 37499Ω (Right)
    50F = 22572Ω
    68F = 14007Ω
    86F = 8935Ω
    104F = 5844Ω
    122F = 3911Ω
    140F = 2676Ω
    158F = 1870Ω
    176F = 1331Ω
    194F = 965Ω
    212F = 710Ω
    230F = 531Ω
    248F = 403Ω
    266F = 309Ω
    284F = 241Ω
    302F = 189Ω (Left)
    http://www.autometer.com/temperature...mp-gauges.html (1/8-27 NPT)
    http://www.summitracing.com/parts/ATM-2252/ ($27)


    Auto Meter 2252 (Delphi 12160855) Thermistor Specifications
    Temperature = Ohms:
    -40F = 402392Ω 1.8C
    -31F = 288981Ω 1.8C
    -22F = 209817Ω 1.8C
    -13F = 153922Ω 1.8C
    -4F = 114026Ω 1.8C
    .5F = 85256Ω 1.8C
    14F = 64306Ω 1.8C
    23F = 48910Ω 1.7C
    32F = 37499Ω 1.7C
    41F = 28977Ω 1.7C
    50F = 22572Ω 1.7C
    59F = 17717Ω 1.7C
    68F = 14007Ω 1.7C
    77F = 11150Ω 1.7C
    86F = 8935Ω 1.6C
    95F = 7204Ω 1.6C
    104F = 5844Ω 1.6C
    113F = 4768Ω 1.6C
    122F = 3911Ω 1.6C
    131F = 3226Ω 1.5C
    140F = 2676Ω 1.5C
    149F = 2232Ω 1.5C
    158F = 1870Ω 1.5C
    167F = 1574Ω 1.4C
    176F = 1331Ω 1.4C
    185F = 1131Ω 1.4C
    194F = 964.7Ω 1.3C
    203F = 826.2Ω 1.3C
    212F = 710.2Ω 1.3C
    221F = 612.9Ω 1.2C
    230F = 530.9Ω 1.2C
    239F = 461.5Ω 1.2C
    248F = 402.6Ω 1.1C
    257F = 352.3Ω 1.1C
    266F = 309.3Ω 1.1C
    275F = 272.4Ω 1.1C
    284F = 240.6Ω 1.1C
    293F = 213.2Ω 1.1C
    302F = 189.3Ω 1.1C

    Recap:
    Correct data entry for the Auto Meter #2259 & #2252 Input:
    1) Create the "Thermistor" Input; name & enable it.
    2) Configure as "Custom Therm", Units "F" & Format "1".
    3) Adjust the displayed gauge Min & Max values 100F-340F (#2259), 60F-315F (2253), or 32F-302F (#2252).
    4) At top of Calibration Table, enter temperature scale 340F-100F (#2259), 315F-60F (#2253), or 302F-32F (#2252) from left to right.
    5) At bottom of Calibration Table, enter Sensor Resistance-Ohms 20Ω-1123Ω (#2259), 14Ω-1200Ω (#2253), or 189Ω-37499Ω (#2252) from left to right.
    6) Then "Pin Map" the new Input to an available ECU connector input pin.
    That's it. The #2259 sensor is inexpensive, compact & self grounding, so it's an easy one wire connection.

    Notes:
    1) I really like the Auto Meter 2259 sending unit. It's very active; as opposed to some lazy sending units I've dealt with in the past. (Of course, ensure your
    transmission case is well grounded.) It's small enough to fit anywhere and at $16, it's affordable to monitor/datalog the temperature of multiple components.

    2) UPDATE: The Sensor Resistance (Ohms) scale issue was fixed in a recent V2 software update. 999,999 is now the highest Ohms value allowed.

    3) If the I/O menu icon (ICF) isn't already uploaded (added) to the top Toolbar, follow these instructions:
    (This same procedure applies to all the various Individual Configuration menu icons/items.)
    The "I/O" function is an "Individual Configuration" of the Holley EFI software.
    At top of screen, Click "Toolbox" and "Add Individual Config".
    At top of new window, select "Individual Configuration Library".
    At bottom of new window, select "Holley EFI Inputs/Outputs Config".
    Select "I/O" and open "Base Config - Blank.io".
    The "I/O" icon will then be present at top of screen.
    http://forums.holley.com/showthread....8389#post58389 (How To Create A Custom Input/Output)

    4) To connect up to 4 Inputs & Outputs to the EFI Main Harness, use I/O Auxiliary Harness 558-400.
    Eight Wire I/O Auxiliary Harness Connector Pin-Out (also in the Holley EFI Wiring Manual - LINK):
    Pin A...A12...White/Blue (Input #1) F,5,2,T,H,G
    Pin B...A3....White/Red (Input #2) F,5,2,T,H,G
    Pin C...A13...White/Black (Input #3) F,5,G
    Pin D...A4....White/Green (Input #4) F,5,G
    Pin E...B12...Gray/Yellow (Output #1) H,P+
    Pin F...B11...Gray/Red (Output #2) H,P+
    Pin G...B10...Gray/Black (Output #3) G,P−
    Pin H...B3....Gray/Green (Output #4) G,P−
    http://documents.holley.com/199r10516.pdf (Holley 558-400 I/O Auxiliary Harness Instructions)
    The 558-400 I/O Auxiliary Harness is 20 feet long, and it's "plug & play" into the EFI main harness.
    Attached Files Attached Files
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  2. #2
    Join Date
    Mar 2013
    Location
    Alton IL
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    Danny, is there a way to have one thermistor, signal both the Holley ECU & an Auto Meter gauge?
    I input all the data into Holley & it works great, but when I hook the Auto Meter back up also, it works & Holley doesn't. Any ideas?

    UPDATE: I had them both sharing one input from the thermistor; guess I'll try running 2 wires.
    Ran another wire, so each has its own all the way to the thermistor. Still doing the same thing.
    The Auto Meter gauge works and Holley only shows the minimum, unless I unplug the Auto Meter wire.

  3. #3
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    Dec 2009
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    Quote Originally Posted by Samdogmx View Post
    Danny, is there a way to have one thermistor, signal both the Holley ECU & an Auto Meter gauge?
    Thermistor (2-wire) type sensors send a variable resistance measured in Ohms. This signal can not be shared by two devices. Conversely, RPM & 0-5V signals (3-wire) can be split to two devices.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  4. #4

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    Hi Danny, I installed one of the Auto Meter 2259 sensors into my transmission pan and added the custom thermistor settings into my ECU. I Pin Mapped it to input number two. I also have a LCD Touchscreen installed. I am doing something wrong, because I can't get the transmission temp to show up on the LCD Touchscreen. I have downloaded the tune from my laptop to the ECU. I did check the voltage at the sensor with a voltmeter. The temp in my garage is around 55 degrees and the voltage on the meter showed 4.25 volts. I checked it from the sensor to the transmission pan and from the sensor to the car frame. Both readings were the same. Thanks for any help and let me know if you need any more information.

  5. #5
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    Quote Originally Posted by Doug A View Post
    I am doing something wrong, because I can't get the transmission temp to show up on the LCD Touchscreen.
    The 5.7" TSLCD will only display the numerical reading (Data Monitor), not on a "gauge".
    The TSLCD Data Monitor must be configured by the user. Tap on a channel for options.
    Read top of the last page (Data Monitor Channel Selection) of the Touchscreen LCD Manual:
    http://documents.holley.com/199r10524rev4.pdf (TSLCD Manual)

    If you're using the new V2 software/firmware, have you updated the TSLCD?
    The TSLCD needs to be updated separately. Click here for the three files:
    https://www.holley.com/support/resou...Fuel_Injection (Holley V2 5.7" Touchscreen LCD Updates)
    http://documents.holley.com/techlibr...een_update.pdf (How To Update Touchscreen LCD)
    The CAN Bus wiring should look exactly like figure 3, on page 3 of the Touchscreen LCD Manual.
    Some HC (High Capacity) SD cards can also cause problems with the TSLCD.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  6. #6

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    Thanks Danny. I will update the touch screen tomorrow and give it a try.

  7. #7

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    Quote Originally Posted by Danny Cabral View Post
    Thermistor (2-wire) type sensors send a variable resistance measured in Ohms. This signal can not be shared by two devices. Conversely, RPM & 0-5V signals (3-wire) can be split to two devices.
    Hi Danny, two questions.
    Question 1) Would I be correct in assuming the OEM GM LSx sensors are the 0-5V signals, and thus can be split between the gauges and the ECU?
    Question 2) The sensors I have indicate about 140F at room temperature (on the computer in online mode) and close to 300 at normal operating temperature. This is incorrect, and does not match an accurate gauge. Looking at the CTS sensor calibration curve, I cannot make sense of the x-axis resistance values (0-16). Is this only representative, and must these values be changed to actual resistance/temperature values (e.g. 180 = 125 ohms) in 16 increments of progression.

    It just seems odd that 1) the graph is reversed in that the highest resistance for my sensors is at the lower temperature end, and 2) the default program is such a misrepresentation of actual values used. I was hoping to be able to see these values under the GM LSx CTS option, but no graph is supplied for that for me to reference, and instead my only option for looking at any graph is in Custom type. Thanks, Terry.
    Last edited by blueovalz; 03-13-2014 at 09:48 PM.

  8. #8
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    GM 2-wire sensors are thermistors that cannot be split.
    GM 3-Wire sensors are 0-5V sensors and have no issues with splitting the signal wire.
    (You only need to split the signal wire, leave the ground wire alone and the 5V reference signal wire alone.)

    If you need a thermistor type sensor to go to two spots, you will have to buy a sensor for each device,
    (I.E. One sensor to go to a gauge, and an identical 2nd sensor to go to your datalogger.)
    You can use a Y block, or a T, or just put the 2nd sensor in a completely different location as necessary.

    ALL SENSORS ARE DIFFERENT
    Some will read low Ohms = high temp/high Ohms = low temp.
    And others will read low Ohms = low temp/high Ohms = high temp.
    There is NO INDUSTRY STANDARD for values of a temperature sensor.

    And correct, if you use a predefined sensor, it will not show a table.
    Conversely, you cannot really use that table to come up with a value for another sensor.

    The best approach, is to contact the sensor manufacturer and get them to send you a data sheet for it.
    It will either be linear, or it will come with a value = Ohms chart with multiple points.

    If you cannot get one from the manufacturer, your best bet is to purchase a good digital thermometer, and place the sensor in stable temperature environments to make your own table with data you collect. (Get cold temps from the freezer/fridge, get some middle temps from the ambient air temp in a well shaded spot, get hot temps from a pot of boiling water, or from other hot liquids...measure Ohms and write down values as you go).
    Last edited by S2H; 03-13-2014 at 11:34 PM.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  9. #9

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    Thanks Scott. I'll go forward then with the scaling on the sensor graph (received a scaling table from the sensor manufacturer yesterday).

  10. #10

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    Danny, thanks for the suggestion on using the 2259 over the 2252. I gave up trying to figure out loading the 2252, and was able to use your post to setup the 2259 in just a few minutes, for a few inputs. (Now what to do with the five 2252 senders and plugs.)

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