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b18c4 manual

Discussion in 'ECU's, Electronics, and Tuning' started by Elvestas, Apr 3, 2009.

  1. Elvestas

    Elvestas New Member

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    Apr 3, 2009
    where i can find 5.5 gen b18c4 manual. i need wiring diagrams. thanks
  2. Luis998

    Luis998 Honda Enthusiast

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    Jan 14, 2008
    Orlando, Florida
    Are you talking about the ECU or the whole engine harness? If it's the ECU this thread may help...


    Or perhaps you are looking for this...

    OBD1 Honda ECU pinouts


    These are the pin designations for the OBD1 ECU as well as their wire color and voltage. I always have a hard time finding this information when I need it as I'm sure others do, so here it is

    (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
    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
    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
    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)
    D6-VTM VTEC pressure switch Light Blue, n/a
    D7-TXD/RXD (data link connector) Light Green/Red, n/a
    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

    If that is not what you are after then umm, I suck.Let us know which diagram you are looking for exactly. That is what I just found. Best of luck to you my friend. :thumbsup:
  3. Elvestas

    Elvestas New Member

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    Apr 3, 2009
    thanks for this ;) but i need whole engine harness...
  4. Luis998

    Luis998 Honda Enthusiast

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    Jan 14, 2008
    Orlando, Florida
    That may be a tall order. I'll see if I can't dig something up.
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