Author Topic: Probably dumb question about MAF sensor location  (Read 868 times)

Halminator

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Probably dumb question about MAF sensor location
« on: November 18, 2020, 04:30:03 PM »
Well, I just can't find the location of the mass airflow sensor on my 1.2 Jazz. Youtube had only 1 video and that one is about a 2013 Jazz. Also can't find it via Google. Even my Haynes manual doesn't seem to understand the existence of this sensor (look at the attachment).

I understand somewhat where it should be located. But I just don't know where it is. Can someone help me out? Maybe encircling it on a photo? Thanks in advance!  :)

Edit: the i-dsi does not have a MAF sensor it seems. I didn't expect this because it is possible to buy a MAF sensor for a 1.2 Jazz on various websites.

My plan was to clean the MAF to maybe battle the engine management light (cylinder misfire) wich comes on every 1000 miles or so. I replaced everything else. What can I do to to the equivalent of cleaning the MAF when I don't have a MAF?
« Last Edit: November 18, 2020, 05:01:27 PM by Halminator »

Jocko

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Re: Probably dumb question about MAF sensor location
« Reply #1 on: November 18, 2020, 07:17:37 PM »
DSi has a MAP sensor. Generally, a car uses either MAP or MAF to determine the airflow index the engine is getting and that older cars used to have MAP and newer ones often use MAF and cars like the Mitsubishi EVO uses both of them.

http://www.hondafitjazz.com/manual/A00/HTML/07/SAA2E07A20326940001KBAT00.HTML

MAP = Manifold absolute pressure and is a sensor to measure vacuum, the computer calculates the engine airflow based on the vacuum, throttle position, and intake air temperature. The computer also measures the barometric pressure using the MAP sensor before the engine cranks, this lets the computer compensate for altitude, or how dense the air is.

sparky Paul

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Re: Probably dumb question about MAF sensor location
« Reply #2 on: November 18, 2020, 07:30:11 PM »
Yes, I think the iDSI uses the MAP sensor to calculate engine load.

When you say that you have replaced everything else, it might be worth summarising what you have actually swapped out.

Halminator

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Re: Probably dumb question about MAF sensor location
« Reply #3 on: November 19, 2020, 11:10:00 AM »
Well, as I said in my other topic: My engine management light comes on. It goes a little like this: light flashes -> 40 miles later it flashes again -> 15 miles later it stays lit. When I delete the codes via OBD2, the cycle repeats itself about every 1000/1500 miles. The codes I get show misfires. Always the code for a random misfire and sometimes misfires in cylinder 1 and 4 and sometimes the faults rotate to misfires in cylinder 2 and 3. I can't really feel the engine hesitating.

Things that have been done: replaced spark plugs and changed gap to 0,6 mm, changed all 8 coils, changed knock sensor, adjusted the valves, cleaned EGR valve, replaced air filter (and interior filter, engine oil, oil filter and wheel bearing, but that shouldn't matter) It has cost me 1000 euro's so far. The problem is not solved.

So I thought, cleaning the MAF couldn't hurt. But I don't have a MAF. So I was looking for a way to clean the sonsors responsible for vacuum. I hope my story makes sense  :P
« Last Edit: November 19, 2020, 11:13:24 AM by Halminator »

sparky Paul

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Re: Probably dumb question about MAF sensor location
« Reply #4 on: November 19, 2020, 01:05:49 PM »
I'll give you 10/10 for perseverance.

Did you change or clean the crankshaft position sensor, as suggested in the other thread?
« Last Edit: November 19, 2020, 02:27:27 PM by sparky Paul »

Halminator

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Re: Probably dumb question about MAF sensor location
« Reply #5 on: November 19, 2020, 02:06:39 PM »
Thanks  ;)

No not yet. I'll see if I can do that myself, but I am no mechanic. Allthough I'm learning.

Edit: it seems access is from underneath near the timing chain cover. I'll try to clean the sensor when I receive my ramps.
« Last Edit: November 19, 2020, 02:25:57 PM by Halminator »

sparky Paul

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Re: Probably dumb question about MAF sensor location
« Reply #6 on: November 19, 2020, 02:29:57 PM »
Thanks  ;)

No not yet. I'll see if I can do that myself, but I am no mechanic. Allthough I'm learning.

Edit: it seems access is from underneath near the timing chain cover. I'll try to clean the sensor when I receive my ramps.

Yes, it's a bit of a sod to get to.

Hopefully, your ramps are a bit shallower than mine, I can't get the front up without fouling the bumper.

Halminator

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Re: Probably dumb question about MAF sensor location
« Reply #7 on: November 19, 2020, 03:21:53 PM »
Well, if the bumper gets wrecked on my ramps, I'll just remove the black lip underneath the bumper. Never understood those things. I'll have the extra clearance any day.

But if the CPS is not the culprit, what do you think is left for me to resolve the problem?

Westy36

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Re: Probably dumb question about MAF sensor location
« Reply #8 on: November 19, 2020, 03:27:53 PM »
Have you seen this thread?

https://clubjazz.org/forum/index.php?topic=12391.msg89256#msg89256

You say you've cleaned the EGR valve, however forum member Wilderbeest took his cars inlet manifold off and cleaned it. A very cost effective repair.  :D Hope the helps.

sparky Paul

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Re: Probably dumb question about MAF sensor location
« Reply #9 on: November 19, 2020, 04:10:11 PM »
But if the CPS is not the culprit, what do you think is left for me to resolve the problem?

There can't be much left.

Either you are getting unnoticed misfires, probably spark related, or it's a false indication - the ECU determines misfires from the pulses from the crank sensor, and they can fail - quite often giving problems once the engine is warm. Although it's difficult to get at, it's certainly worth cleaning the crank sensor first, because it's an inductive sensor they tend to collect small metal particles which can interfere with the detection.

I take it there's no rattling from the timing chain? You haven't mentioned it, but that can cause false detection of misfires. Next worry of course is wiring to the crank sensor, and or even the ECU.

Struggling to think of much else, you've covered most of the common problems.

Halminator

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Re: Probably dumb question about MAF sensor location
« Reply #10 on: November 19, 2020, 04:17:04 PM »
Interesting  :)

Allthough I dont get fault code 401, I can always check the inlet manifold. Do you think it can be cleaned with MAF sensor cleaner? Because ofcourse I ordered that before I checked if I have a MAF   8)

@Sparky Paul: the only thing I hear is the relaxed and gentle sound of my valves. No timing chain rattle. So I will tackle the CPS first!

sparky Paul

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Re: Probably dumb question about MAF sensor location
« Reply #11 on: November 19, 2020, 06:00:01 PM »
Allthough I dont get fault code 401, I can always check the inlet manifold. Do you think it can be cleaned with MAF sensor cleaner? Because ofcourse I ordered that before I checked if I have a MAF   8)

Most of these things are designed to shift carbon gunk, if it's similar to carb cleaner, it should do the job.

It probably isn't EGR related, but we could well be getting to the 'clutching at straws' stage soon.

Halminator

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Re: Probably dumb question about MAF sensor location
« Reply #12 on: November 23, 2020, 04:59:26 PM »
I crawled under the car and cleaned the CPS. It wasnít very dirty. Immediately the light came ok, but it was a bit overdue 😃 So the CPS isnít the culprit 🤔

sparky Paul

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Re: Probably dumb question about MAF sensor location
« Reply #13 on: November 23, 2020, 06:42:12 PM »
I crawled under the car and cleaned the CPS. It wasnít very dirty. Immediately the light came ok, but it was a bit overdue 😃 So the CPS isnít the culprit 🤔

You could only say that with any certainty if you swapped it for a new one, they can go faulty.

Did you give it a good looking at, no surface cracks etc.?

Halminator

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Re: Probably dumb question about MAF sensor location
« Reply #14 on: November 24, 2020, 11:10:14 AM »
I crawled under the car and cleaned the CPS. It wasnít very dirty. Immediately the light came ok, but it was a bit overdue 😃 So the CPS isnít the culprit 🤔

You could only say that with any certainty if you swapped it for a new one, they can go faulty.

Did you give it a good looking at, no surface cracks etc.?

I gave it a good look, it was like new. But just to be sure, I can replace it, as it is an inexpensice part. Is buying the cheapest one a good idea? The prices start at around 9 pound but the most expensice ones are around 50 pounds.

Would one of the top 2 be a good idea? https://www.autodoc.nl/auto-onderdelen/krukassensor-15032/honda/jazz/jazz-ii-gd/16816-1-2







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