I have weird problem with my CA18DET factory ECU, My engine came from factory with automatic gearbox but now I have manual gearbox and engine Ecu for manual gearbox. But I have tryed 3 different ECUs but all of them have weard problems.
All ECUs are 2371 39FF00
Ecu one: when RPMs are troping they are stopping on idle for a second, then dropping to 500 and up to ide again.
Ecu two: Same as ecu one but do not rise idle RPMs from 850, disconnect aac and reconnect, worked as ecu one.
Ecu three: worked fine until I tested spark plugs and now when I turn off the ignition switch nothing is happening, until I unplug ECU relay. I think I burned something in ecu.
I have deleted all things what can mess up idling except aac valve. I have cleaned and replaced aac valve many times.
It helps I can make video from 3 different ecu...
My question: Why is those CA18DET factory ecus so problematic when dropind to idling? Is there some components what are failind becaus they are quite old?
If all ecu are 23710-39F00 , its an MT ecu.
It is not those CA18DET factory ecus problematic, its usually bad wiring or sensor.
If all idle control device working, idle will drop smoothly.
Idle contrl device included : air regulator, proper adjusted throttle body with coolant flow thru, TPS sensor, AAC valve, proper parts no. AFM.
Is there any device on your CA missing ?
I tested all components from ECU socket, all readings except AFM was fine.
Air flow meter is reading little bit off:
Idle is 1.6V (ok)
2500 RPM is 1.9v
3400 RPM is 2.2V
Manual is saying that on 2500 RPM should be 2.2v
I have 90 degree elbow between turbo and MAF. I mounted honeycomb in front of MAF but no change.
I tested A/T engine ECU, no problem when engine is going to idle.
With M/T ECU bigger the boost bigger the problem!
I have tested all components many times as service manual are saying and set idling, replaced AAC valve, clean all connections.
I have no idea what to to/test next
Before the MAF (between the air box , pipe ID or air filter adaptor ID), it has to be 100% same size as the MAF inlet ID , you won't get correct readings if ID of the air box/air filter is not matching with the MAF.
After the MAF, use whatever you like.
One of my friend's S15, using a mushroom filter with a aluminium adapter which is 2 to 3 mm smaller than the MAF inlet ID, it read less air to the ecu and will have leaner AFR.
NISSAN factory air box have a velocity stack built in the box, which works very well for the MAF, it has exactlly same ID as the MAF inlet.
If you place your MAF right after the filter box like nissan factory does, sure it will work better than close to the turbo inlet .
it is better to use JDM S14 Zenki ecu (if you had not order CA18 nistune), only swap few pins to use, much better response and better throttle enrichment (CA18 ecu can't tune the throttle enrichment, its alpha N but no real effect)
Do I understand right that SR20 don't use throttle switch? So pin 54 and 57 are not used.
SR do not use throttle switch (Idle switch), but function are built in to the ecu, TPS voltages are "memory" and needs to reset if TPS voltage vs Throttle posistion has been changed .
ie : TPS sensor location and the throttle plate relation had been changed (fully closed posistion)
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