Hi,
Below is a list of the polarity settings I have tried for the option word bits 0,1 and 2.
The closest I can get is the Bin#1 below with bit 0 and 1 checked and 2 un-checked. everything display's correctly in the WUD [B]except[B] for 3rd gear is show in WUD as 1/2 gear.

I only can think of 8 combinations of the flag settings to try. Does anyone see something that I am missing???
Thanks
Dave


EBL P-4 Trans switch chart 1988 Chevrolet IROC-Z 5.7 700R4 trans code "YMM" no 3rd gear switch on the valve body.

Bin # P/N 3rd Gear 4th Gear How the gear selection shows in the Whats up display EBL-P4
0 Checked Checked Checked Park and Neutral display as P/N. Reverse, 1st, 2nd, 3rd show as O.D. 4th shows as 1/2
1 Checked Checked Un-Checked Park and Neutral display as P/N. Reverse, 1st,2nd & 3rd show as 1/2. 4th shows as O.D.
2 Checked Un-Checked Checked Park and Neutral display as P/N. Reverse, 1st,2nd & 3rd show as O.D. 4th shows as 3rd
3 Un-Checked Checked Checked Park and Neutral display as P/N. Reverse, 1st,2nd & 3rd show as 3rd. 4th shows as O.D.
4 Checked Un-Checked Un-Checked Park and Neutral display as 1/2. Reverse, 1st, 2nd, 3rd and 4th show as P/N.
5 Un-Checked Checked Un-Checked Park and Neutral display as O.D., Reverse, 1st, 2nd, 3rd and 4th show as P/N.
6 Un-Checked Un-Checked Checked Park and Neutral display as 3rd. Reverse, 1st, 2nd, 3rd and 4th show as P/N
7 Un-Checked Un-Checked Un-Checked Park and Neutral display as 3rd. Reverse, 1st, 2nd, 3rd and 4th show as P/N

 

Just want to confirm, are you running the EBL-P4 or EBL Flash with your '88 Iroc?

 

The P4 Also it's re-pined per the sheet that RBob sent with the ECM (had a '165 prior).
Only changes to the re-pin are...
1) Both the AIR injection leads (B2&F4) along with the EGR (E9)are disconnected and insulated at the engine side of the harness.
2) My wide band is pinned to B2 and the G force sensor Y axis is pin E1 X axis is E2.

This car uses the optical speed sensor. One note but I don't think it would have an effect is my speedo needle bounces 2-3 mph. So I need to find time to pull out the cable and clean & re lube it
It's a 1 owner car with 49k on the clock.

 

Without the 3rd gear switch in the transmission the WUD won't show 3rd gear. It will show P/N, 1/2, or OD (4th).

RBob.

 

thanks!!!