Originally Posted by Honda-Tech

6. I’m done swapping the heads, now how do I make my VTEC work?
The P28 ECU plugs right in, you all you’ll need to do is wire the VTEC up. First, you’ll need to get an engine plug from a junkyard for the VTEC solenoid oil pressure.

You can see mine here, it’s big and yellow:


Here is what the back of your ECU plugs look like:


You’ll need to run the blue wire (or whichever color is from the plug) to pin D6, and then run the black ground wire from the plug to anywhere on the motor. You then need to run the green wire from the VTEC solenoid to pin A4.

THAT’S IT! YOU’RE FINISHED! Make sure you’re not throwing any CEL’s, if you are, go back and check your work.

My mini-me, fully complete:

Originally Posted by Superhonda

KEY:
(voltage values measured in DC Volts unless otherwise specified)
V = Volts
Wht = White
Blk = Black
Grn = Green
Yel = Yellow
Brn = Brown
Blu = Blue
Org = Orange

KOEO = Key On Engine Off
KOER = Key On Engine Running

A, B, D= Slot. Numbers are read up and down from left to right, not straight across (see diagram at end).

A1-INJ1 INJECTOR#1 Brown, Battery Voltage with KOEO
A2-INJ4 INJECTOR#4 Yellow, Battery Voltage with KOEO
A3-INJ2 INJECTOR#2 Red, Battery Voltage with KOEO
A4-VTS VTEC solenoid GRN/YEL, n/a
A5-INJ3 INJECTOR#3 Blue, Battery Voltage with KOEO
A6-PO2SHTC O2 sensor heating element Org/Wht, Battery Voltage with KOEO
A7-FLR1 fuel pump Grn/BLK, Battery Voltage with KOEO
A8-empty A7 and A8 have the same circurt, so they can be the same
A9-IACV IAC valve Blk/Blu, About 10v KOEO on Warm engine
A10-empty
A11-EGR Control Solenoid Valve (if the ECU has it) Red, n/a
A12-FANC engine coolant temp switch Blu/red, n/a
A13-MIL MIL (check engine light) Blu/wht, n/a
A14-empty
A15-ACC (a/c compressor clutch) Red/Blu, n/a
A16-ALT C alternator Wht/Grn, n/a
A17-IAB IAB Solenoid Pink, n/a
A18-Org/Red, Transmission Control Module (A/T), n/a
A19-White, Intake control solenoid, Battery Voltage with KOEO
A20-PCS EVAP purge control solenoid Red/Grn, n/a
A21-ICM Yel/Grn, Ignition Control Module output signal, About 10V KOEO
A22-Igniter, same as A21
A23-PG1 ground Black, Power ground, less than 1V
A24-PG2 ground same as A23
A25-IGP2 to main relay and to ground Yel/blk, Battery positive from Main relay, Battery Voltage with KOEO
A26-LG1 gound Blk/red, less than 1V

B1-IGP2 to pin A25 Yel/Blk, Battery positive from Main relay, Battery Voltage with KOEO
B2-LG2 ground to shields for CYP & TDC Brown/Blk, <1V
B3-Orange, upshift/downshift comparative input, n/a
B4-Pink, upshift/downshift comparative input, n/a
B5-ACS a/c switch Blu/Blk, a/c input, ~5V with KOEO & A/C off; <1V KOER with A/C & blower on
B6-empty
B7-Light green, Park/Neutral switch (A/T), <1V in Park or Neutral with KOEO; 5V in Park or neutral with KOER; Battery voltage in all other positions
B8-PSPSW PSP switch Red/Green, Power steering oil pressure switch, 0V KOEO; Battery Voltage KOER While slowly turning steering wheel
B9-STARTER SIGNAL starter signal Blue/red, Battery Voltage in the START position (clutch depressed on M/T models)
B10-VSS vehicle speed sensor Orange, Pulses 0-12V while turning the left front wheel
B11-CYP P CYP(#1 piston position) -P Orange, CYP sensor input, n/a
B12-CYP M CYP -M White, CYP sensor signal, n/a
B13-TDC P TDC(top dead ceter) -P Org/Blue, TDC sensor input, n/a
B14-TDC M TDC -M Wht/Blue, TDC sensor signal, n/a
B15-CKP P CKP(crank position) -P Blu/Green, CKP Sensor input, n/a
B16-CKP M CKP -M Blu/yel, CKP Sensor signal, n/a

D1-VBU Back Up Power Wht/Yel, Battery positive From battery through Fuse Box, Battery Voltage at ALL times
D2-BKSW brake switch Grn/wht, Battery voltage at all times
D3-KS Knock Sensor Red/Blue, n/a
D4-SCS service check connector Brown/Wht, ~5V (M/T); ~11V (A/T)
D5-empty
D6-VTM VTEC pressure switch Light Blue, n/a
D7-TXD/RXD (data link connector) Light Green/Red, n/a
D8-empty
D9-ALT F alternator Wht/Red, Alternator Charging Signal, ~4.5V KOEO; Decreases under Electrical load (Headlights & rear defogger on) At warm idle
D10-ELD electric load detector input Grn/Blk, n/a
D11-TPS (throttle position sensor) Signal Red/Blk, ~0.5V KOEO with throttle fully closed; ~4.5V KOEO with throttle fully open
D12-Wht/Blk, EGR Valve Lift sensor, ~1.2V KOEO
D13-ECT (engine coolant temp) sensor input Yel/Blu, ~5V KOEO (varies with temperature)
D14-PHO2S O2 sensor White, heated 02 sensor Signal, 0.4-0.5V when ignition is turned on; drops to less than 0.1V within 2 minutes
D15-IAT Intake Air Temperature sensor signal Red/Yel, .05-4.5V KOEO(Varies with temperature)
D16-VREF (no info)
D17-MAP Map Signal Wht/Blu, ~3V KOEO (Varies with Temperature)
D18-Light Green/Blk, Transmission Control Module (A/T Only), n/a
D19-Red/Wht, Reference Voltage, ~5V KOEO
D20-Yel/Wht, Reference Voltage, ~5V KOEO
D21-Blue/Wht, Sensor ground, <1V
D22-Green/Wht, Sensor ground, <1V