ca18det wiring

[A.Dutsov]

http://www.diyautotune.com/images/carte ... -relay.gif
is this true for emu also?
any special instructions with this engine wiring, compared to sr20? for example there are 2 tps plugs, can i remove the idle switch(second plug with 2 wires)? Also few idle control valves here, one under intake we will use, can i remove the big one on the intake? No knock sensor on this engine?
Do we need diode on the idle like on the sr20?

[pric]

Yeah you can connect it like that, but there is probably a simpler way. But I'm not familiar with Nissan.
There is no need for an Idle Switch. Idle is on if the tps is under a certain percentage.
You can run the engine whitout an iac-valve. I don't know if the small one is enough for your needs. If it has a big coil i would place a flyback diode.

Greetings

[A.Dutsov]

Ok, one question ... original ecu is powered by permanent 12v power without ignition switch, do we use this power source, or better use the ignition on wire? Now its wired like original, but maybe nissan engineers are not genius in wiring ... also the ground dont look good, original its only on intake ... or at least its in this s13 car here ... so maybe its a good thing to ground the intake to chassis?

[A.Dutsov]

Also fuel pump is working too long time when on ignition ... is it ok for this car, or its some relay problem? Or maybe problem is we powered emu with permanent 12v?

[pric]

So your ECU is permanently on?
Pump should be started by the ECU, you can set how long it primes.

[PSI-Motor]

Don't use permanent 12v when instructions clearly says switched.

[A.Dutsov]

We used it because it was originally like that, but will change it tomorrow to switched. And one mystery here, will investigate it tomorrow ... IAT sensor issue, when plug it, car shut down. When unplug it, car works fine. When put another IAT sensor, again brand new ... car shut down. Changed the signal cable ... same thing. Put the plug from the IAT sensor, to the CLT sensor ... car works, IAT shows water temp ... tomorrow will try to change firmware, and also will try both cables to be new to the sensor ... strange is we have also one sr20det engine, and both sensors work there, also when car is not running, both sensors show real IAT, on cold engine about 23-24 deg, on little bit warmed up engine ... like 38-40 deg ... but car just dont like to work with IAT connected. The other strange thing is, when we connect the CLT sensor car works ... so maybe not wiring problem?

[A.Dutsov]

So your ECU is permanently on?
Pump should be started by the ECU, you can set how long it primes.

Pump starts by the ecu, because ecu is permanent powered, but main relay is not, so when you turn key on ignition, main relay is powered, then the pump relay is powered ... but anyways ... we will change it tomorrow to switched power.

[pric]

Maybe your calibration for the iat is complete bananas?
So that the car goes so lean/rich that it shuts down.

It runs when no sensor is connected because of the entered fail safe value. (e.g. 25°C)
Also look at the iat correction table in Fueling.

What type of sensor does the CA18 have?
Make sure none of the poles is directly grounded by the sensor!

greetings

[A.Dutsov]

IAT sensor is from ECU master, its the one from citroen/peugeot, with 12x1,5 thread ... I tried 2 of them. Calibration is automatic, 039 bosch sensor, it reads perfect when car not working, read ambiend temp right, read when car is warmed ... i changed firmware, nothing improved. IAT correction in fueling, does not matter i think. it was all 0, then i entered some values inside ... same thing. Problem is strange. When i connect the plug to the water temp sensor, it show the water temp instead of iat, and car runs. When i connect IAT plug to the IAT sensor, car start for 1 second, then shut down, and this can last forever ... something is not right, but i cant find what. I think when i connect CLT sensor, and car works, this mean wiring and emu input are fine ... but also i changed 2 brand new IAT sensors, and its all the same. Today i will try VW iat sensor, just to see how it is.

[Jadzwin]

Did you tried to upgrade to 1.174 ?