TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics

min]:0.00341796875,0.0029296875,0.001953125,0.007080078125,0.044921875,0.0625,0.0625
"end
(Bill Lawrance wrote)
A9L Table Format Explanation
Eectch98-Part2.fm
I’m putting this note in front of Gary Anderson’s recent post on tables for the A9L. I hope it helps in
understanding them. Gary has done a great piece of work here. He deserves real credit for digging this
out. Everything I’ve added here I got from studying his post.
This note describes how the tables displayed in the post are represented in the EPROM. I got this from
reading the program. This is only useful or interesting if you want to see how this is done. Nothing in
the original post or in this note tells how these tables are actually used, although their titles are
descriptive. Neither are there any units on the axes of the tables, although their titles are also
descriptive.
There are 2 types of tables displayed.
---------------
1) Two dimension Tables
---------------
The first of the two kinds of tables is identified in the output with ’table’ in the third line of
output for a table. For example, the first table listed is:
"Accel Enrichment Fuel [lb/min]
"Throttle Rate [Deg/sec] vs. ECT
"table:29131,8,7,1,d4,0
:1.5,1.5,2,3,4.5,8,12,18
:1.5,1.5,2,3,4.5,8,12,20
:2,2,3,4.5,8,12.5,18,29
:4,5,6,8,12.5,17,25.5,34
:5,8,10,12,16.5,21,27,45
:12,14,16,18,26,30,38,55
:21,23,26,28,31,34,39,56
"end
--The first line is the title of the table
--The second line is "X-axis label vs. Y-axis label"
--The third line is decoded as follows:
table -- identifies this as a 2 dimension table
29131 -- the decimal location of the table in the PROM (or 71CB hex )
8 -- the number of columns (X-axis) in the table
7 -- the number of rows (Y-axis) in the table
1 -- number of bytes for each value in the table
d4 -- the scale of the value, in this case divide by 4 to get lb/min of fuel that each entry represents.
’m’ is used in other tables to specify ’multiply each entry’.
From the binary:
0 -- each entry is unsigned
0071C0 - 54 5C 68 70 7C
0071D0 88 9C E0 30 38 40 48 68-78 98 DC 14 20 28 30 42
0071E0 54 6C B4 10 14 18 20 32-44 66 88 08 08 0C 12 20
0071F0 32 48 74 06 06 08 0C 12-20 30 50 06 06 08 0C 12
007200 20 30 48
Grouping into rows of 8 columns:
54 5C 68 70 7C 88 9C E0
30 38 40 48 68 78 98 DC
14 20 28 30 42 54 6C B4
10 14 18 20 32 44 66 88
08 08 0C 12 20 32 48 74
06 06 08 0C 12 20 30 50
06 06 08 0C 12 20 30 48
EEC-IV Technical Notes: Software 43 last edited: 9/29/98