LSEGHATCH

A buddy of mine just swapped in a d15b into his cx and is currently using the CX wiring harness. I've been looking up diagrams for him and am confused. Where do you run the wires to for the vtec, do they go to the grey plug by the passenger shock tower or do you have to run them straight to the ecu? There are three empty slots in the grey plug as shown but i'm not sure if it's for the extra 3 wires for the O2 or if two are for vtec.

We have the ecu (p28) but don't know which pins to tap for the vtec or how to wire it, if that is where it goes instead of the grey plug.

Here are the pics of the plug and what not.






Modified by LSEGHATCH at 5:49 PM 3/20/2006

turboxsi

I wired my b16 straight to the ecu with a 94 cx, the vtec pressure and solenoid, knock and 3 wires for the 4wire o2. In my car one of the 4 o2 wires besides the single wire ran for the cx o2 (which you use) was ran through the main harness (gray i believe) but not into the engine bay, so i pull out one of those black plugs (in your pic) and ran a wire to the o2 heater i believe is what it was, the other 2 i pinned right to the ecu as the 4th wire (o2 signal) in the single wire for the cx which is ran through the engine harness. There is no vtec wiring (soleniod and pressure) or knock or the 3 other o2 wires for that matter for the 4 wire o2 you will need to use. So run them thought the fire wall either at the main harness point under the battery or the coolant line for heater (that what did). With some loom and zip ties it will look fine.

LSEGHATCH

I think i know what your saying but I don't get what ports to wire these into. I need a diagram and also the d16b he got came with a single wire O2 so why would you have to change to 4 wire?

turboxsi

Well if you use the p28 it will look for a 4 wire o2 sensor. And if it doesn't see it you will get a cel for the o2 heater control. And the only wire you would use that is ran from the ecu through the main harness is the orange w/black stripe to the engine harness which is the heater control wire. The other 2 are for grounds.


Modified by turboxsi at 7:04 PM 3/20/2006

LSEGHATCH

Do you know of any diagrams that show which wire goes where for what? Also how do you wire into the ecu, or do you wire into the harness that meets the ecu?

turboxsi

There will be no wire going to the pinouts you need(exepct the orange w/black stripe i mentioned above), so you will have to either find unused pinouts from the ecu on your harness or find some off another cars main harness to the ecu plugs(junk yard is a great place to start). I don't have a diagram as I use a helms guide, that god of all honda manuals. Because you have no pinout to the areas you need all you need is the socket pinout that goes into the main harness plugs for the ecu and then run them to the proper sensor.

coneheadsracing

I know the 92 cx came pre wired for vtec. But you will need the right harness, one with the plugs for vtec in it.

LSEGHATCH

What harnesses are compatible with the d15b motors? Can you use any obd1 vtec harness wether it be from a d16z6 or a gsr motor?

flatblack-h22

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSEGHATCH &raquo;</TD></TR><TR><TD CLASS="quote">What harnesses are compatible with the d15b motors? Can you use any obd1 vtec harness wether it be from a d16z6 or a gsr motor?</TD></TR></TABLE>

the z6 can be used

LSEGHATCH

Are there any others?

coneheadsracing

not positive but i'm pretty sure that the b motors should be fine as well, minus say an additional knock sensor.

turboxsi

yeah the vx can be used too.

LSEGHATCH

any of the b-series harnesses?

VRD^sam

KEY:
(Wire color), (Function/Description (if need be)), (Voltage Value (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

OBD1
A1-INJ1 INJ1 Brown, Battery Voltage with KOEO
A2-INJ4 INJ4 Yellow, Battery Voltage with KOEO
A3-INJ2 INJ2 Red, Battery Voltage with KOEO
A4-VTS VTEC solenoid GRN/YEL, N/a
A5-INJ3 INJ3 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- This is EGR Control Solenoid Valve (if the ECU has) 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 ICM Yel/Grn, Ignition Control Module (ICM) Output signal, About 10V KOEO
A22- *per Sander* Ignitor 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 gound for o 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, Less than 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, About 5V with KOEO & A/C off; less than 1V KOER with A/C & blower on
B6-empty
B7- Light green, Park/Neutral switch (A/T), Less than 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 -P Orange, CYP sensor input, N/A
B12-CYP M CYP -M White, CYP sensor signal, N/A
B13-TDC P TDC -P Org/Blue, TDC sensor input, N/A
B14-TDC M TDC -M Wht/Blue, TDC sensor signal, N/A
B15-CKP P CKP -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, About 5V (M/T); About 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, About 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 TPS Signal Red/Blk, About 0.5V KOEO with throttle fully closed; About 4.5V KOEO with throttle fully open
D12- Wht/Blk, EGR Valve Lift sensor, About 1.2V KOEO
D13-ECT ECT sensor input Yel/Blu, About 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 IAT sensor Red/Yel, Intake Air Temperature signal, .05-4.5V KOEO(Varies with temperature)
D16-VREF VREF shows BLANK on my diagram
D17-MAP Map Signal Wht/Blu, About 3V KOEO (Varies with Temperature)
D18- Light Green/Blk, Transmission Control Module (A/T Only), N/A
D19 - Red/Wht, Reference Voltage, About 5V KOEO
D20 - Yel/Wht, Reference Voltage, About 5V KOEO
D21 - Blue/Wht, Sensor ground, Less than 1V
D22 - Green/Wht, Sensor ground, Less than 1V

LSEGHATCH

^^^^

Already veiwed that but says b-series motors only, doesn't state anything for d-series and since I'm not sure if they go hand in hand I didn't use the diagrams.

VRD^sam

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSEGHATCH &raquo;</TD></TR><TR><TD CLASS="quote">^^^^

Already veiwed that but says b-series motors only, doesn't state anything for d-series and since I'm not sure if they go hand in hand I didn't use the diagrams.</TD></TR></TABLE>

Same **** tyler...jsut like reusing your EX harness for a b16 swap