Discussion in 'ECU's, Electronics, and Tuning' started by civic_01, Jun 16, 2003.
hello guys im having trouble putting an ecu from 99-00 civic si into a 91 civic
There is no benefit to even attempt to wire OBD2 into a OBD0 car. In fact, it's a huge waste of time and money.
But, if you really want to do this, you'll need to buy a OBD2 (99-00) Civic Si HELMS manual, and a 88-91 (your car here) HELMS manual and match the wiring up.
I know for a fact, you'll need to add the following wire(s):
Extra 02 sensor wires (primary and secondary)
Vtec Pressure Switch
Crank Fluctuation Sensor
MIL (Check Engine Light on Dash)
OBD2 Diagnostic Port
OBD2 Self Diag port (2 wires)
Vehicle Speed Sensor
Good luck with your endevour
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