TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics
TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics
TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics
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ECT Advance<br />
-256 2<br />
86 3<br />
120 0<br />
200 0<br />
236 -2<br />
246 -4<br />
254 -4<br />
Table 33: WOT Spark Advance vs. ECT<br />
Eectch98-Part2.fm<br />
The WOT Spark Advance vs. ECT Function is located at 7532 hex in the A9L <strong>EEC</strong>. An<br />
interleaved table of 7 one-byte signed X-Y values, the “X” values (ECT) are multiplied<br />
by 2 and the “Y” values (advance inn degrees BTDC) are divided by 4 to convert<br />
them.<br />
ACT Advance<br />
-256 0<br />
-256 0<br />
-256 0<br />
150 0<br />
240 -6<br />
254 -6<br />
Table 34: WOT Spark Advance vs. ACT<br />
The WOT Spark Advance vs. ACT Function is located at 7540 hex in the A9L in a<br />
signed, one-byte format for both the X and the Y interleaved values. The “X” value<br />
(ACT) is multiplied by 2 and the “Y” value (Advance in degrees BTDC) is divided by<br />
4.<br />
TP<br />
(A/D counts)<br />
Enrichment<br />
Multiplier<br />
0 1<br />
200 0.953125<br />
452 0.296875<br />
852 0<br />
1020 0<br />
Table 35: Accelerator Enrichment Multiplier vs TP<br />
The Accelerator Enrichment Multiplier vs. TP Function, located at 71C1 in the A9L,<br />
is a table of interleaved X-Y values each unsigned and one byte in length. To convert<br />
them to decimal, the “X” values (TP sensor in A-D counts) must be multiplied by<br />
4 and the “Y” values (the fuel enrichment multiplier) must be divided by 128.<br />
RPM Multiplier<br />
0 1<br />
1600 0.90625<br />
2400 0.96875<br />
3200 0.9453125<br />
3800 0.9765625<br />
4400 0.953125<br />
6000 0.9453125<br />
<strong>EEC</strong>-<strong>IV</strong> Technical Notes: Software 33 last edited: 9/29/98
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