E48I - no spark

This section is dedicated to discussion of DTA engine control units such as the DTA E48 EXP, P8 Pro, DTA S40, S60, S80, and S100, as well as all things ECU related.
Hiro_c20xe
Posts: 6
Joined: Sun Jan 02, 2022 2:34 am
ECU Model: No ECU

E48I - no spark

Post by Hiro_c20xe »

Hi,
I am newbie here. Could anybody give me any advice?
I got kitcar-C20XE with E48I ignition(Weber carb) last December, but no spark when cranking.
At first, I replaced new lead, plug, coil and crank sensor, but still did not wake up.
So next I checked when ignition ON,
- voltage "0v-12v-0v" @3pin/coil
- voltage "5v" @3pin/TPS
"maybe" E48I is still alive, I think with above result.
(But I do not know whether "0v-12v-0v" situation is correct or trouble...)

So I did next step,
- when cranking, no voltage(no flashing) both side@3pin/coil

Now I am here and I do not have any idea what I should do next...
Any idea/checkpoint is helpful. Thank you!
katana
Posts: 455
Joined: Sun Jan 27, 2013 6:08 pm
ECU Model: S60 Pro
Firmware Version: 29

Re: E48I - no spark

Post by katana »

I assume by the 0v - 12v - 0v reference your ignition switch is providing 0v at 'off' position, 12v at 'run' position and 0v at cranking position? If so there is your problem! The DTA and the ignition system need to be live and stay live even if switch is in position 3 / cranking - that position should only energise the starter system (and a ballasted ignition system if fitted)
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: E48I - no spark

Post by stevieturbo »

So it's bought as a non-runner, or has it ever run ?

You should obviously have 12v somewhere at the coil during cranking. This is vehicle wiring, not ecu output wiring.
Hiro_c20xe
Posts: 6
Joined: Sun Jan 02, 2022 2:34 am
ECU Model: No ECU

Re: E48I - no spark

Post by Hiro_c20xe »

Hi guys, thank you for quick reply/suggestion.
Yes, I bought non-runner(pre-owner said "moved last year"...), so I thought she has something trouble, but,,,.

Anyway,
"0v-12v-0v" means 3pin wires from ECU(to coil) at coil plug, when ignition ON and without cranking.
center is 12v(during ignition ON) for coil power, and side wires(both 0v) are COIL1&2 trigger from ECU.
I do not know trigger wire (COIL1&2) which "12v or 0v" is correct when ignition ON(without cranking) at DTA system.
My opinion, without cranking, both trigger holding "12v" is correct.

Is this unit fault? and I should replace newer ignition system(T2i or S40i)???
Thank you!
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: E48I - no spark

Post by stevieturbo »

Buying without fully diagnosing....not so great.

However you're in an awkward spot, that it is a very old ecu and not sure whether the readily available software will connect to it ? Best to call Alex perhaps.

Although going forward, and for ease of use....a new modern unit would make some good sense.
Hiro_c20xe
Posts: 6
Joined: Sun Jan 02, 2022 2:34 am
ECU Model: No ECU

Re: E48I - no spark

Post by Hiro_c20xe »

Yes, me think so too.
Of course, newer ECU is better for me/car, so I will go if/when cannot fixed.
also will try to contact Alex how I can diagnose.

stevieturbo and katana, thank you for advise/suggestion!
philworsley2
Posts: 2
Joined: Wed Jan 05, 2022 10:37 am
ECU Model: P8 Pro
Distributor: DTAFAST

Re: E48I - no spark

Post by philworsley2 »

Hi there,

Just a thought - Check the wiring. If you've swapped the coil pack are the pinouts the same as the one fitted before? Also you've inherited a fault so worth checking end to end connectivity between the ECU and the coil. For example- My car was originally fitted with a Valeo coil pack and I think that's died so I'm fitting a Bosch one. When I was looking it up there seemed to be choices of coil pack and some had different wiring requirements than others. Also worth attaching a laptop if you haven't already.... that will give you a ton of information on what's going on and will allow you to confirm the health of the crank and throttle sensor too.
Hiro_c20xe
Posts: 6
Joined: Sun Jan 02, 2022 2:34 am
ECU Model: No ECU

Re: E48I - no spark

Post by Hiro_c20xe »

Hi Phil,
Thank you for your suggestion/advice.
I will check wiring connectivity this weekend. maybe new coil pack has same wiring order, but also will re-check this.
Yes, "laptop" is good solution, so I will arrange new pc in a near future.
Anyway, quick question about "coil trigger voltage", when "ignition ON" without cranking, which "12v or 0v" is correct?
Thank you!
Rob Stevens
Posts: 1247
Joined: Thu Jul 28, 2011 4:10 am
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)

Re: E48I - no spark

Post by Rob Stevens »

you should see 12v with 12v applied to the other connection of the coil, the ecu will only ground this whilst it sees the engine turning to start the dwell period.
Does the fuel pump work from the ecu ok?
Hiro_c20xe
Posts: 6
Joined: Sun Jan 02, 2022 2:34 am
ECU Model: No ECU

Re: E48I - no spark

Post by Hiro_c20xe »

Hi Rob,
thank you for your answer, means something trouble with my unit...
I did not check fuel pump output voltage, just checked 5v output for TPS.
I will check this too. Thank you!
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