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Thread: Terminator X CTS & MAT Error

  1. #1

    Default Terminator X CTS & MAT Error

    We just finished putting a Terminator X Max on a car and having issues with a Holley 4BBL throttle body MAT sensor. Selected Holley 4BBL MAT in the tune and GM LSx CTS. Uploaded tune and both show Low ERR. Only way we can get them to read is to do a Custom MAT & Custom CTS. But using a GM resistance temperature chart, the readings are way off.

    CTS reads roughly 120 Ohms at ambient (90°F). I forgot the MAT Ohms at ambient. But it looks like a MAT from an F-body. We tried GM LSx MAT and get LowERR. Any ideas? Thought there was a list of suggested sensors, but we looked through the instructions & manuals with no luck. The CTS is a parts store special. We didn't have another one to test. Thanks!

  2. #2
    Join Date
    Dec 2009
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    Connecticut
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    This may be caused by a defective sensor (since some share +5V reference and all share a common ground). The CTS & MAT are thermistors, they only share the Sensor Ground. Since the TPS, MAP, Fuel & Oil sensors share the same +5V & Ground, I'd disconnect each sensor one at a time (laptop "Online" with ECU), and see if one unplugged sensor rectifies the fault. If so, then that's the culprit. I'd try troubleshooting these sensors key-on/engine-off.
    https://forums.holley.com/showthread...189#post214189 (Related Forum Thread)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3

    Default

    Thanks again Mr. Danny! Ordering the USB/CAN cable tomorrow to try and make this an easier troubleshoot.

  4. #4
    Join Date
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    Connecticut
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    You're welcome.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #5

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    So got new sensors and still the same LOW ERR on CTS & MAT. And now with the laptop plugged in, I see Trans line temp is LOW ERR as well. Unplugged all the sensors and nothing changed. What to do now? We have a extra ECU here we're going to try.

    So we took my buddy's whole Terminator X Max kit and hooked it to a battery we had in the shop. Went through the Wizard and sent tune to ECU. With the new ECU/harness we took the MAT & CTS out of the engine we thought were bad. Plugged them into the new harness and ECU. They reported correctly. So we removed the ECU from the car and plugged it tho the harness on the floor. Low ERR is all it showed. Thinking ECU issues now. Put the new ECU in the car and the sensors we had in the harness on the floor. They reported correctly in the car. So now we know harness and grounds are good. Still thinking bad ECU. Flash the car tune in the borrowed ECU to make sure a setting wasn't wrong.

    All sensors reported correctly. So after all that we are 99% sure we have a bad ECU. Waiting to hear back from Holley now. It takes forever to get anybody on the phone with Holley and we have an event we're trying to make it to in two weeks.

    UPDATE: Holley agreed it sounded like a bad ECU. We shipped it to them on a Friday and had the replacement ECU this Friday. The tech told us they haven't seen that issue before. So we got tune loaded in new ECU and it's running great now. Did some tuning and found out transmission won't shift into 1st gear. But 2nd gear starts pulled strong. Got fuel & spark dialed in. Waiting on transmission builder to come troubleshoot.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
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    Thanks for updating this thread.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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