Somebody can confirm this, but I don't think the ECM can communicate with the TH400. There are no triggers or sensors built into the TH400.
Somebody can confirm this, but I don't think the ECM can communicate with the TH400. There are no triggers or sensors built into the TH400.
1986 ski centurion boat, 351W, gt40P heads, edelbrock performer rpm, 1227747 ecm, 72 lb/hr injectors (@18 PSI fuel pressure), .490/.490 lift, intake 278 duration, exhuast 282 duration, 112 lobe separation
1969 camaro, 355ci, performer RPM intake, camel hump heads, 1227747 ecm, 454 throttle body (@18 PSI fuel pressure),
2016 Chevy Cruz
2014 Chevy Silverado
The ECM grounds the kickdown relay to energize the solenoid in the valve body. I'm wondering if these settings are for that ground signal.
68 Cadillac, 472 & TH400 w/7.4L TBI and EBL **sold**
93 K1500 short step, 5.7 & NV4500 and EBL
68 C10 LQ4/TKO swapped
I think you are using an older .xdf file, V4 maybe? The most current .xdf can be downloaded here: http://www.gearhead-efi.com/Fuel-Inj...Information-42 I think the parameters you have posted are not listed the same in the latest version $42 .xdf file.
The 1227747 will operate a TH400 relay with a ground signal for the "Kick Down" or "3rd gear down shift into 2nd gear".
dave w
These are what I'm using, per EagleMark's links;
$42-1227747-V4T.xdf and $42-1227747-V3T.adx are advanced files with Data Tracing for TunerPro V5 RT. For Turbo 400 trans/3 speed bin files.
If I use the V5's I get TCC lockup options only
68 Cadillac, 472 & TH400 w/7.4L TBI and EBL **sold**
93 K1500 short step, 5.7 & NV4500 and EBL
68 C10 LQ4/TKO swapped
Ok, the above is correct.
The answer to your question, yes the ECM sends ground to the TH400 Kick Down Relay using Pin A7 of the 1227747 ECM. I have not figured out which parameters are involved in changing the TH400 Kick Down. Maybe the shift indicator inputs / outputs?
dave w
Last edited by dave w; 05-11-2014 at 08:17 PM.
Ok,that's how I have it hooked up. I have the GM wiring manual for 89, it's been very helpful.
I may play with some of those settings and see what happens. Pretty sure I'm not getting electrical kickdown as is, or at least not where I'm expecting it. It only seems to 3-2 downshift in ranges where the modulator is doing it.
Last edited by blue68deville; 05-11-2014 at 08:35 PM.
68 Cadillac, 472 & TH400 w/7.4L TBI and EBL **sold**
93 K1500 short step, 5.7 & NV4500 and EBL
68 C10 LQ4/TKO swapped
One option would be to use the old style TH400 kick down switch to apply ground to the relay. http://www.gearhead-efi.com/Fuel-Inj...7-Turbo-400-4F
As I understand it, the relay need to send 12 volt ignition power to the kick down switch in the transmission.
dave w
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