Rb20det stand alone factory unit

[kevyc]

Hi guys,

sorry I know parts of this have been covered and it has been a massive help!! Although I have an issue:

i have an rb20det in my s13, there are no looms in the car apart from the engine loom & fuel pump wires. 

All plugged in and I have 3 power wires into the ecu & 6 ground wires out of the ecu; the car turns over and has injectors tick and fuel spray when fuel relay activated but I have NO SPARK.

i have power, earth and signal continuity from the ecu going to all the coils, cas and injectors; ami missing something from the ecu to tell coils to spark?

i swapped the igniter for a working one(same issue), should I try swapping cas and ecu?

 

thank you guys and sorry if I can’t find the info.

regards,

kev ?

[GTSBoy]

Entirely possible the ECU's ignition outputs have been fried.  Try putting a test light from power to an ignition line from the ECU (at the ignitor would be convenient and see if you even get a flicker of light when the ECU should be switching the output to ground.  Pulsewidth might not be enough to get a glow, but if you do get a glow, at least you can assume that that ECU output is working.

[kevyc]

Thank you mate, I’ll try that now and see how it goes, would it be best to mock up a led test light due to low voltage?

32 minutes ago, GTSBoy said:

Entirely possible the ECU's ignition outputs have been fried.  Try putting a test light from power to an ignition line from the ECU (at the ignitor would be convenient and see if you even get a flicker of light when the ECU should be switching the output to ground.  Pulsewidth might not be enough to get a glow, but if you do get a glow, at least you can assume that that ECU output is working.

 

[GTSBoy]

Try with a globe test light first.  If you see nothing, you might try the LED.

[kevyc]

Just tried both mate and no light up. Also tried to get the ecu into diagnostics mode but the led just says lit. Maybe I’ll try a new ecu and cas?

[GTSBoy]

If you know anyone with a portable LCD CRO or are willing to buy a cheap USB one for your phone, you could test the waveform more thoroughly.  Otherwise, you may be into the realm of swaptronics.

Actually, if you have or can borrow an analogue multimeter, you might see something on that.  It should sit at 12V (if you probe the ignitor connection from the ECU with the other side of the meter on earth).  If the ECU pulls the ignitor down to earth, even briefly, it might be enough to make the needle flicker down from 12V.

[kevyc]

Thank you bro. Seen a heap of people on here with no spark issue on the rb20det. But no conclusions to the end result haha. Even crossed my mind to get an aftermarket ecu and run it through that way?

[GTSBoy]

Best to test shit first.  ECU might be good.  Wiring might be duff.  New ECU wouldn't help that!

[kevyc]

Hey guys, update on the thread- now I have spark (ignition switch wire at the ecu needed relay power to it?)

now I don’t have an injector pulse haha. Injectors have power at each side however it’s not being switched via the ecu; would this happen if the timing was180 degrees out? I ran a new relay to feed the constant injector line, but still no good. Ecu is earthed at pin 107,108 and 116. Also 50 &60

 

have I missed something or do I ha e a dodgy cas or ecu?