Does the CA have a MAP sensor?

[Spectre23]

Does it use a MAP for measuring boost? I just remember the boost line feeding into something for the boost control system, but does this feed back to the ECU? Sorry, I know I used to know all this. Just been so long.

[boost_boy]

NO!

[float_6969]

Nope. No MAP sensor of any kind on the CA.

[Spectre23]

So all boost is compensated for in the map based on rpm and throttle position and of course MAF and O2 sensor readings?

[float_6969]

Fuel and ignition timing are based primarily on the input from the MAFS and CAS. Any other sensors are used to make adjustments from there. The ECU HAS to have those 2 signals to run. Throttle position is used for fuel enrichment (accelerator pump) and to activate idle fuel and timing maps. O2 sensor is for closed loop only and the input is ignored outside of closed loop parameters.

The stock ECU uses the CAS to tell RPM and and to sync the crank/cam position so it knows when to fire the injectors. The ECU runs in sequential injection mode until certain limits are met, then it converts to batch injection.

The MAFS is used to tell load by giving a reading of the actual mass of air entering the engine. From there the ECU references the fuel and timing tables vs. RPM and injects the specified amount of fuel and fires the coils at the appropriate time.

If you want a more specific understanding, the FSM has everything you would want to know.

[themadscientist]

Mine had a MAP sensor, but it was for the VPC, not Nissan original. I hate MAFs.