Need Help With Rb20det Wiring

[darkl0n]

hi all

i am trying to get a rb20det running in a vl, but i have an issue with the wiring, when i turn the IGN on, the fuel pump primes, the lights on the ecu are on, but it won't start so i pulled out the CAS and turned it around with the IGN on and started testing wires, the injectors are working, but i am getting no power to the ignitor pack from the ecu while spinning the CAS, i have tested the wires back to the ecu and they are fine. dose anyone have an ideas were i have gone wrong.

Cheers

Dan

[blind_elk]

ECU doesn't supply power directly to the ignitor - it switches a relay that powers the coils.

Edited June 23, 2006 by blind_elk

[darkl0n]

i can't see any relays in the wiring diagrams, as there are 6 wires comming from the ecu to the ignitor and then the other side of the ignitor goes to the 6 coils packs.

i am getting no signal to fire from the ecu, so if you could explaine were this relay is ment to be, that would be help full.

[predator]

it's down near the ecu.. there are two of them and they should be green (on r32).. the power source for the engine is switched through them. The ignitor gets it's power feed directly from one of the pins of the relay.

[darkl0n]

ok, i think i know were i have gone wrong, i will look in to it when i get home.

Cheers

[darkl0n]

ok, after looking over the diagrams again, i am still lost with what you gays are saying, the ignitor pack has 6 wires going in one side, and 7 the other side. on the side with 6 wires it shows them going to the ecu(pins 1, 2, 3, 11, 12, 13), then on the other side it shows 6 wires going to the coils and 1 wire going to earth.

the only thing i can see that is connected to one of the relays is the power going to the coils.

let me know if i have this all wrong

Dan

[BHDave]

I think they think you are confused.

The ignitor is connected directly to the ecu via 7 wires. 6 triggers and an earth.

The 6 outputs from the ignitor run to the coils. I think it's the E pin but i could be wrong there

What the guys are talking about is the ign relay which supplies power to the coils. This is the most likely culprit for your no spark issue.

In a nutshell, make sure that the ign and eccs relays are getting a 12V feed. The ign relay will be connected to the + pin on all the coils. The - pins are all common earthed.

Edited June 22, 2006 by BHDave

[darkl0n]

the 6 triggers from the ecu, are they - or + triggers

i'll check the eccs and the ign relay, but i am shore they have power.

cheers

Edited June 22, 2006 by darkl0n

[kiwi32]

The 6 triggers are negative switching

There is a latching plug close to the igniter which also goes to the coils this has the positive feed and earth as well as the timing link wire.

Check you have 12 volts and earth at the cas then check the 2 signals with a LED one will pulse 6 times per revolution of the cas the other 180 times per revolution which will look as though it is on all the time unless you turn it very slowly.

[darkl0n]

ok, i now have spark, IGN and ESSC relay are working, i have given 12v + to the aac valve and the 02 sensor heater, also the CAS is working,

but the motor still won't start, any idea's what else i am need to check.

cheers

Edited June 22, 2006 by darkl0n

[RRob]

In the engine bay wiring near the afm there is a rectangular plug(big pins) give the white and purple wire constant 12v..

[BHDave]

About the only thing left is to make sure that the ignition on signal that goes direct from the key to the ecu is still providing power when cranking. Afm could need power aswell. And you may also need to hook up the cranking signal to the ecu (but that isn't essencial and it should still fire without it) You know the injectors will fire when ignition is on, you know the fuel pump works and you know you have spark

And that the fuel hoses are connected the right way I've made this mistake myself once.

[blind_elk]

Is the CAS aligned correctly. It should only fit one way because of the half-moon keys in the CAS and the camshaft.

Often, the camshaft key snaps off, permitting the CAS to align only on the teeth.

[grigor]

Fuel goes in the bottom engine fuel pipe and returns to tank on the top engine fuel pipe.

Engine won't go the other way around.

[darkl0n]

thank everyone i got it running,

BHDave hit the nail on the head, it was the IGN wire from the switch not giving power when cranking.

Edited June 26, 2006 by darkl0n

[BHDave]

w00t!

I ran into this problem today coincidently, on a mates cef that I wired about 2 years ago. Even though it was hooked up it wasn't supplying enough power to switch on the power fc.

Took me ages to find another source that provided enough power while cranking but didn't set the relays clicking (in the same way as ryno's problem) when the ignition was turned on.