SAFC DIAGRAM FOR B21 (obd1) 90-91 Prelude

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Rudeludenotmeanthough posted this up on preludepower, and im gonna put it up here for you OBD1 guys..

(From: http://www.preludepower.com/phpBB2/viewtopic.php?t=34977)

If you try to use the OBD0 diagram to wire in the SAFC on your OBD1 car... you will have probs. The obd0 and obd1 wirig are very diff.

Here is the diagram if you have a 90-91... prelude with the b21 (obd1)...
RPM -- BLUE wire on the ignition coil. The TOP plug with ONE blue wire on it.
MAP -- PIN D17 White/Blue
Ground -- PIN A23 or A24 both are black
Power.... Pin A25 yel/blk

SAFC diagram for OBD0 88-91 preludes (b20a5)
RPM -- BLUE wire on the iGnition coil. The TOP plug with ONE blue wire on it.
MAP -- PIN C11, White/Blue
Ground -- PIN A2, or A4 Both are BLACK
Power -- PIN A15, yellow Black.

MiSC.
A/F gauge/o2 sensor --
*obd1-- PIN B12 white
*obd0-- PIN C16 white

TPS Signal --
*obd1-- PIN D11 Red/Yellow
*obd0-- PIN C7 Red/Yellow

--------------------to install----------------------
1. Disconnect the batt
2. unplug the ECU
3. strip the casing back on the ORIG harness(car),
4. attatch the SAFC wiring to it accordingly, and solder in
5. wrap with tape on each wire....

BLAM built in harness.

~anthony