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Old 12-08-2009, 05:32 PM   #41 (permalink)
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HELP! I don't know where those ignition harness wires go. Do they go to the main relay? I'm having difficulty here. It seems simple but figuring out what should go where is twisting my mind. Think that pink wire went to power the srs. Its the only pnk wire I could find in any drawings. I'm also wondering why I didn't find any wire that leads to the hazard fuse. hmm?

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Old 12-08-2009, 05:42 PM   #42 (permalink)
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might not make the most sense to everyone but here are most of the wires I rung out:

a/c heating

6 WHT RED 10 HTR MoToR 40A fuse
23 BLK YEL HTR Motor Relay under dash fuse 7.5A pwr to several
7 BLU WHT 10 BLWR MOTOR RELAY to blower motor
8 WHT GRN 14 rear defog pwr fuse 50 to defogger relay
42 BLK RED Cooling fan relay to radiator fan pwr
43 BLU RED ECU connector C5 (AC sw signal) to a/c pressure sw
39 RED MG Clutch relay (A/C compressor clutch)
40 WHT Condensor fan relay to cond fan motor
44 BLU WHT Condensor fan relay to a/c thermostat and pressure sw
46 blk to connector on thermostat for a/c fan????

45 BRN to cutoff point
32 WHT BLK 16 To 1 pin connector


sensors

47 wht blu to altenator ICU and (gauges)
36 YEL GRN to 1 pin ect sending unit under distributor (gauges)
37 YEL RED to oil pressure sensor (gauges)
35 BLU to distributor (rpm output) (gauges)


ECU

5 GRN ORG A18 MIL ECU (gauges)
3 WHT RED A30 ECU to upshift light (gauges)
26 GRN WHT brake sw to ECU connector 'D' pin 5
30 BLU WHT To blu org Ecu connector'C' pin 6 (starter signal sw)
28 WHT BLU ECU connector 'C' pin 10 (voltage backup)
10 BLU WHT ECU connector 'C' pin 18 and VSS
38 BRN BLK to brn blk distribution connector, ecuA9,A22 Logic Ground
33 YEL BLK to yel blk distribution connector (to PGM-FI MAIN RELAY)
11 RED WHT Engine Coolant Temperature to ECU connector D2 and to ect sensor.


Electronic Load Detector

Note:GRN RED from ecu C16 to fuse blc ELD connector
BLK to ALL Blk connector from fuse block ELD connector
31 BLK WHT 22 (ELD) to blk yel tagged #34 (ign system)


Data Link Connector

16 BRN BLK to connector w/ lt blu & wht red (DLC)
24 WHT RED 2nto1 INT Lights fuse + connector w/ lt blu & brn blk (DLC)

Service check connector

brn to ecu 'c' 7


Exterior Lighting

27 GRN BLK backup sw on transmission to rear backup lights
48 YEL RED back up sw on transmission to under dash fuse
2 WHT BLU back up fuse (radio, heater ctrl, pcm pwr)
1 WHT GRN brake sw (coil side of relay) / horn relay fuse 52 to under dash horn relay
41 WHT GRN Horn Stop Fuse to horn relay under dash
9 WHT 14 headlight fuse to combo sw / headlight sw & ICU



ignition system

34 BLK YEL to blk yel distribution connector, two wires out. IGN coil and IGN CTRL MODULE alternator sp sensor fuse 15 7.5A and to blk wht eld wire.

4 WHT BLK 8 IGNITION SW PWR fuse 42

IGN HARNESS WIRES!?!
these are all smaller 16 or 18 gauge

17 YEL GRN 16 IGN connector Pin 1
18 YEL GRN 16 IGN connector Pin 2
19 YEL BLK IGN connector pin 3
22 WHT BLK IGN connector pin 4
GRN YEL pin 5 to ecu connector A16 fuel pump relay
20 BLU WHT IGN connector pin 6
21 BLK IGN connector pin 8
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Old 12-08-2009, 06:00 PM   #43 (permalink)
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Maybe I don't even need to worry about the ignition harness wires. I think I may be using my original wiring as much as possible. I think I'll leave the original under hood fuse box to handle lighting and chassis and add the new under hood fuse box in parallel to control the engine and ecu.

Last edited by 88hf; 12-08-2009 at 06:25 PM..
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Old 12-08-2009, 06:24 PM   #44 (permalink)
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Normally, when swapping in a new engine, you're better off to use your existing harness and add/modify where necessary.

For a good example of why, look into swapping a 4th gen SI engine into a DX. The wiring harnesses are completely incompatible, unless you plan on putting the entire chassis harness into the car as well. You'd spend less time and effort (in that case) just adding in the 4 wires necessary and moving a few around to support the new engine.

In your case, there would be more moving/addition, but OBD2 subharnesses can be bought cheaply, and they plug right into your existing harness to move the wires to the points they need to be for the OBD2 ECU. After that, it's a matter of adding in the wires you need for the sensors into the existing plugs from your chassis. I have a feeling if you'd gone this route, you'd be done with wiring already.
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Old 12-08-2009, 07:40 PM   #45 (permalink)
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I haven't started wiring yet... just figuring out what all these cut wires are on the engine harness. It should not be difficult to wire it in with the fuse boxes in parallel from the battery. obd0 to obd2 is pretty different than what most people do, or to the swap you are referring. If you have a link to where someone has done this "simply" I'd like to see it. Not kidding, I would. I'm an electrician by trade, I like wiring to be tidy.
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Old 12-08-2009, 07:44 PM   #46 (permalink)
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You'd have to check out TempleofVtec.org and HondaTech.com (warning, HondaTech is full of both good information and bad... sort accordingly.)

I believe HaSPORT makes the conversion harness, as well.

I'm aware that OBD2 is much different from non-OBD cars, but most of the sensors have been there for the whole time, from FI's inception to now. The ones that were never there before can be added to the wiring harness easily enough.

I'm not an electrician, but I have done plenty of wiring on cars and the like.
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Old 12-08-2009, 07:50 PM   #47 (permalink)
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Here ya go:

OBD0-2aJ

and

Swap Accessories
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Old 12-08-2009, 08:19 PM   #48 (permalink)
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I'm pretty sure I'm not going that route, but I certainly appreciate the input.
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Old 12-08-2009, 08:20 PM   #49 (permalink)
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No problem. If you want to make your own adapter like that, I've got a junk ECU I could pull the plug ends from if you want... prolly be like $10 for my time.
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Old 12-09-2009, 12:05 PM   #50 (permalink)
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Quote:
Originally Posted by 88hf View Post
I don't think there is a secondary O2 sensor. No wiring for it connector wise and the ecu connector isn't pinned for it.
It might be that particular engine/ECU doesn't use a secondary O2. I seem to recall something said on H-T about JDM ECUs not needing a secondary O2 (it's just to check Catalytic converter efficiency anyways)
Quote:
Originally Posted by 88hf View Post
Also, confused about why the pin for ecu ECT comes into the cabin. I thought that would have been straight from the thermostat to the ecu. Why does it appear there are three temperature sensors? Reference: Part Detail
#11 is the single wire sensor that goes to the Temp Gauge in the cluster
#13 is the two wire temp sensor that the ECU uses
#12 is the two wire coolant fan switch
Quote:
Originally Posted by 88hf View Post
Should have it completely figured out soon
Cool!

Quote:
Originally Posted by 88hf View Post
HELP! I don't know where those ignition harness wires go. Do they go to the main relay? I'm having difficulty here. It seems simple but figuring out what should go where is twisting my mind.
The harness that is attached to your key cylinder runs just above your under dash fuse box and then plugs into that ignition harness you had in your hand, if I'm remembering correctly here. it attaches to the top of the fuse panel but is not part of it. You should see something extremely similar on your current fuse panel in your CRX.
Quote:
Originally Posted by 88hf View Post
Think that pink wire went to power the srs. Its the only pnk wire I could find in any drawings.
I agree with the Pink wire being the power source for the SRS system as that was the only pink wire I could find in any of my diagrams as well.

Quote:
Originally Posted by 88hf View Post
I'm also wondering why I didn't find any wire that leads to the hazard fuse. hmm?
look for a wire labeled as "backup" that tends to share the same wiring as the Hazard fuse.

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Last edited by TomO; 12-09-2009 at 12:11 PM..
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