ty1295

Ok, getting ready to run a 16197427 ecm to control an 80e running $31 code. We have made now an XDF and ADS file so that is 95% done.

Working on which wires I need to tap into the stock ecm (749) to the 7427.

I am 99% sure it needs a spark signal, in order to sense rpm.

It seems GM has decided to name a few things differently though.

Here are the two ecm wiring diagrams for the distrubtor.

http://www.nwstp.com/chips/P4_docs/749sunbird2.jpg
www.nwstp.com/4l80e/16197427/95pcm4.jpg

What I am wondering is the F11 pin on 7427 is labeled IC Signal.

Is this the tach input in? and which one does it tap into on the syty?

HaulnA$$

You do not need an RPM input to the PCM for stand alone tranny control. All you need is power, ground, TPS and VSS from the tranny for which you will need a DRAC module which will alsu run an electronic speedo. HTH

ty1295

Thanks,

DRAC is no problem as we have those stock already on our app.

There are two wires I was assuming went to same drac output.

16197427 ECM Inputs
F12 Transmission output speed VSS
F13 Vehicle Speed Signal VSS


I have getting a signal from C6 Pin on the DRAC.

Look right?

HaulnA$$

Sorry, I was wrong. After looking at my notes, the RPM signal is required. Splice the ppl/wht wire from pin D8 of the '749 and connect it to A4 of the '7427. Splice the red/blk wire from pin D9 of the '749 to pin A5 of the '7427. This will take care of the RPM input. As for the DRAC, connect C11 from the DRAC to pin F13 of the '7427 and connect pin C13 of the DRAC to pin F12 of the '7427. See pic.

ty1295

A5 of 7427 being "IC Ref Low" ???


Many thanks, might have saved me a few hours or more of head scratching.

ty1295

This is what I have then.

7427 on left 749 on right

A1 Ground-------------------A12 SYSTEM GROUND BLACK/WHITE
A2 Ground-------------------A12 SYSTEM GROUND BLACK/WHITE
A4 IC Ref High-------------------D8 Spark Reference PURPLE/WHITE
A5 IC Ref Low-------------------D9 DISTRIBUTOR REFERENCE LOW BLACK/RED
A15 TPS Signal-------------------F13 TPS SIGNAL DARK BLUE
B3 Sensor Ground-------------------M Ground, TFT, ATF temp -
B4 Sensor Ground Map, EGR, Transmission-------------------A12 SYSTEM GROUND BLACK/WHITE
B5 TFT Signal Transmission-------------------L ATF temp +
E2 3-2 Control Solenoid Transmission-------------------S TCC PWM or 3-2 Down Sol.???
E4 Range Signal B Transmission-------------------R Range B
E5 Range Signal C Transmission-------------------P Range C
E6 MIL SES Light-------------------E7 CHECK ENGINE LAMP CONTROL GRA/WHITE
E8 2-3 Shift Solenoid Transmission-------------------B Shift Solenoid B (2-3)
E9 1-2 Shift Solenoid Transmission-------------------A Shift Solenoid A (1-2)

E10 TCC Solenoid Control Transmission-------------------T TCC ON/OFF -
E11 PWM Solenoid Control Transmission-------------------U TCC PWM
E15 Ignition-------------------A6 12 V IGNITION (FUSED) PINK/BLACK
E16 Battery-------------------B1 12V BATTERY (FUSED) ORANGE
F1 Range Signal A Transmission-------------------N Range A
F7 PCS Low Transmission-------------------C Line Pressure +
F9 Serial Data ALDL
F10 PCS High Transmission-------------------D Line Pressure -
F11 IC Signal Distributor
F12 Transmission output speed VSS-------------------C13 DRAC SIGNAL BROWN
F13 Vehicle Speed Signal VSS-------------------C11 DRAC SIGNAL
F14 TPS Reference-------------------B5 MAT AND TPS GROUND BLACK
F15 Ignition-------------------E 12Volt Source