K12 engine closed-loop control sensors?

[MC Bodge]

What are the sensor inputs for the K12 1.2 tickover?

I've been told that there's no MAF, but it can't be completely open-loop, so there must be some sensors.

Presumably there are:
Throttle position sensor
Exhaust Oxygen
Intake temperature
Coolant temperature

Anything else?

Which have most effect on tickover/idle/stalling?

Cheers

 

[frank]

mc bodge

there ought to be some means of metering the volume of air flowing eh ?

 

[MC Bodge]

http://www.bba-reman.com/content.aspx?content=nissan_dtc_p0107_0108_map_sensor
DTC P0107, P0108 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR



Component Description

A sensitive silicon diaphragm in the sensor responds to change in pressure.

It is a corrector; it detects intake manifold pressure and sends the voltage signals to the ECM, which in turn computes intake air volume. The voltage rises with the pressure.

The ECM will enter fail-safe mode and the MI will light up whenever a malfunction is detected.



Is this relevant to the Micra then? There must be an air flow detector

 

[frank]

MC bodge

and i take it your fault light is not showing ?

 

[MC Bodge]

MC bodge

and i take it your fault light is not showing ?

No. It's also been plugged into a diagnostics reader and shown no codes...

It's possible that the throttle position provides the air flow measure, but that may not be accurate enough.

 

[Ed]

You have not described what the problem even is. (other than implied) It could be mechanical as well as electronic.

 

[MC Bodge]

I had posted another thread about it.

The problem is a rough idle and intermittent stalling on closed throttle.

From experience of other cars, I'd assumed a sensor could be responding with a slight delay. I'd intended to clean the air mass meter.

Cheers

 

[Ed]

Check everything is clean for a start. The car probably has two lambda sensors, but even with them being slightly off it should idle ok. Check the filters are ok and give it a service if it has not had one. It could be a sticky idle control valve too although its probably a bosch steppermotor type.

 

[MC Bodge]

It could be a sticky idle control valve too although its probably a bosch steppermotor type.

Cheers. Where is the idle control valve situated? I'm assuming that the idle is controlled by a second motor feathering the throttle to maintain engine speed?

The car had a service last weekend, where it showed no faults on the diagnostics.

ps. I removed and re-fitted the Hitachi throttle body last night and cleaned the IAT sensor. It apparently didn't stall this morning, but did idle badly.

 

[Fordy]

age of car and i'll give you a list of what it could be at fault

take out the crank sensor bell housing under air filter, green connector 1 10mm bolt holding the sensor in with rubber seal on sensor, get a picture of the end that goes face into the flywheel then i'll tell you what to do from there

then

take off the rocker cover and get a picture of the overall engine so i can see everything cams and chain etc