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Old 16-01-2018, 03:39 PM   #1
joltfreak
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Default Power but no spark

I've run into a roadblock and I need to bounce this off you guys for help,
I've installed my OBD1 JDM B18c motor in my mini with no issues and I picked the "plug and play" wiring harness from minitec. Its all wired up as it was stated in their instructions and I can't seem to get spark. I've checks to make sure I have power to the distributor and coil. I've replaced the plugs, wires and coil to rule it out. What else could it be?

I'm open to suggestions as working on computer controlled motors is new to me.
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Old 16-01-2018, 07:51 PM   #2
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I had a similar issue and it turned out to be the coil in the distributor, Make sure you have all the signals required from the VR sensors, theres a good video on youtube that might help, I'll have a look now.


Last edited by keitht; 16-01-2018 at 07:55 PM.
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Old 16-01-2018, 10:13 PM   #3
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Thanks for the video link!
I checked the ignitor with my test light and in the video, when cranking the test light would flash if the ignitor was working the coil was bad. The test light would turn off if the coil was good and the ignitor was bad.
When I checked mine, the light stayed on even when cranking. Would that mean the ignitor is good? If so, wher woild I go to next?
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Old 16-01-2018, 11:45 PM   #4
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If you were using a regular 12v bulb to test the Ignitor and not a 12V LED, the light will stay ON all the time. An incandescant bulb wont react fast enough to see a voltage pulse.
Should be tested in the following order.
Step 1. Ignitor flashes when testing..its good. Ignitor doesnt flash, problem with ignitor or wiring.
Step 2. With a GOOD ignitor, Check for Spark at coil. No spark coil is bad.
Even a good Coil wont work if the ignitor is bad.

Have you done a check engine test to see if you have any fault codes showing on the ECU?
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Old 17-01-2018, 02:00 AM   #5
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I also reached out to minitec to confirm that I have my wiring sorted correctly.

I currently have the stock ecu connected to the mini. I do have another ecu equipped with Hondata hardware which I will setup to connect my laptop to scan for errors.
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Old 17-01-2018, 02:01 AM   #6
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My test light is not an led.
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Old 17-01-2018, 03:41 AM   #7
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Thats why the light is always ON. Doesnt the minitec harness have a CEL light to check the faults on the ECU . You dont need a Hondata unit to read fault codes!
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Old 17-01-2018, 12:40 PM   #8
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The harness doesn't have a CEL light and I was planning on using the hondata hardware in this mini anyway.


Here is the Minitec wiring Instructions:
1) Red - to 12v power wire for instrument lights (connects to headlight switch)
2) Black - to chassis ground (for ECU)
3) Yellow/Black - to fuel pump (this is 12v power supply wire)
4) White/Blue - to constant / battery 12v power supply of ignition switch
5) Black/White - to start signal wire of ignition switch
6) Black/Yellow - to switched 12v source (coil/ignition wire on ignition switch)
7) Green/Red - To left turn signal power
Green/Blue - To right turn signal power
9) Green - to radiator fan relay. This is the ground for low voltage side of the relay (85 position of relay)
10) Yellow - to switched 12v with 2.5 amp inline fuse.
11) Green/Black - connect to reverse light
12) Blue/White - to power side of high beam switch
13) Blue - to fuel gauge sending unit

i am only using this harness for the engine as i already have the body wired up using a painless type body harness

This is what i have connected using the minitec kit :
1, 2, 4, 5, 6, 9 (to the power switch of relay), 10 (with 3amp inline fuse)
With the power and ignition on i tested #3 any there isn’t any power there (although i have my fuel pump wired separately).
Am i missing something? Please advise.
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Old 17-01-2018, 11:22 PM   #9
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Thatís messed up for the amount of money you paid minitec, I would expect them to provide a CEL.
You can always wire in a CEL yourself. Wire from pin A13 on the ECU to a light and from there to a 12 v ignition controlled source.

Did Minitec provide you with a proper wiring diagram for your harness so you can check the pin outs. It becomes very difficult to figure out if thereís a harness problem without one.

A couple of points I noted in your post. it may or may not be related to your problem of no spark, hard to say without a wiring diagram.

You should have power on # 3 for at least 2 seconds when first turning the ign ON. Again Iím presuming that Minitec put a relay in !
# 3 should be part of the PGM-FI relay and should be connected to your fuel pump. The relay operates the fuel pump for 2 seconds to prime the fuel rail when you switch the ignition on, then turns the pump OFF, it only runs the pump continuously when the engine is running. It shuts the pump off when you switch Ign off to stop the engine. This relay also send signals to the ECU and injectors and some grounding points.

Having your fuel pump wired independently is IMHO not a good idea at all.

Why did you put #9 to power side of relay, when it says ground ?
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Last edited by 250ptm; 18-01-2018 at 12:05 AM. Reason: last thought
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Old 18-01-2018, 01:28 PM   #10
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So I spent an hour on the phone with the tech support from the firm the sold me my new ecu and hondata hardware (great customer service!) and my multimeter as I was having some difficulty uploading my new basemap to the ecu. It seems that I'm not getting power to pin b1. This may be also the reason that the ignitor is also not firing.

I'm also a bit angry that minitec has not responded to my emails......
The reason I put up the funds to buy this harness is to avoid getting into what I'm doing now.....this should of been the simplest part of my build!
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Old 18-01-2018, 01:30 PM   #11
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The tech support guy also emailed me a wiring diagram to assist me as well!
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Old 18-01-2018, 01:42 PM   #12
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Quote:
Originally Posted by 250ptm View Post
Thatís messed up for the amount of money you paid minitec, I would expect them to provide a CEL.
You can always wire in a CEL yourself. Wire from pin A13 on the ECU to a light and from there to a 12 v ignition controlled source.

Did Minitec provide you with a proper wiring diagram for your harness so you can check the pin outs. It becomes very difficult to figure out if thereís a harness problem without one.

A couple of points I noted in your post. it may or may not be related to your problem of no spark, hard to say without a wiring diagram.

You should have power on # 3 for at least 2 seconds when first turning the ign ON. Again Iím presuming that Minitec put a relay in !
# 3 should be part of the PGM-FI relay and should be connected to your fuel pump. The relay operates the fuel pump for 2 seconds to prime the fuel rail when you switch the ignition on, then turns the pump OFF, it only runs the pump continuously when the engine is running. It shuts the pump off when you switch Ign off to stop the engine. This relay also send signals to the ECU and injectors and some grounding points.

Having your fuel pump wired independently is IMHO not a good idea at all.

Why did you put #9 to power side of relay, when it says ground ?
All I got from minitec was this list. No diagram.
There isn't a realay on #3 just the wire. This is also another reason i wired it separately with a proper relay.
I also reached out the the manufacturer of the harness, and their list defers from minitec as well..... I will confirm the fan switch once I get the motor to run.
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Old 18-01-2018, 11:20 PM   #13
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That’s not right.
The picture I see of the harness on their Web site has a Main Relay already fitted, it also says its pre-installed in their blurb. if you have none it just won't work at all!

If you have no power on the green wire, or power at pin B1 on the ECU then it either means the harness is wired up wrong or the relay is defective.

The relay has 7 pins and looks something like this.
https://norwalkkiwanis.org/images/ma...integra-wiring

You can easily check the relay for operation with a multimeter, just remove it and follow the instructions. this is an example there are many more on the web.
https://honda-tech.com/forums/honda-...-pics-2535047/

Oh and I found this little jem from Minitec which shows you how to connect a CEL light to their harness. Pretty funny!

http://www.superfastminis.com/MiniTe...ctions%202.pdf

Obviously they forgot to include it. Im not impressed!
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Last edited by 250ptm; 18-01-2018 at 11:33 PM.
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Old 19-01-2018, 11:46 AM   #14
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Quote:
Originally Posted by joltfreak View Post
The tech support guy also emailed me a wiring diagram to assist me as well!
What wiring diagram is it? Might be useful for the rest of us.
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Old 20-01-2018, 08:52 PM   #15
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Here is the link to the pinout
http://technet.ff-squad.com/wiring.obd1.htm
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