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Post Info TOPIC: Vitara overfuelling


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RE: Vitara overfuelling
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The status bit should always be present, that would be caused by an error in the definition, do you know what the part number of the ECU was? can you give me the ECU ID as reported by Rhinoview?

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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Hi,

This is G16B engine (3-wire mass air flow sensor). Did change another ECU but result was the same. 

 

I haven't check the wiring but will do. Anyway, it's my curiosity that if the wiring was wrong meaning ECU didn't see the value, would it make O2S activation flag disappear from the status panel? 

 

I would have thought the status bit should remain there regardless of the wiring. Appreciate your advice. 



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Which model is it? its not showing any voltage from the O2 sensor, have you checked the wiring?



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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Hi,

Another question please. I have another G16B Vitara where I do not see O2S activation flag on the status panel (see attached) and the reading is very lean all the times. 

 

The O2 is physically installed with the wiring back to ECU. Is there any reason why RhinoView does not show the O2S flag? Thanks. 



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Victor wrote:

Thanks. When you mention "engine temperature", are you referring to CTS?


 Yes or WTS as its referred to in the older manuals.



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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Thanks. When you mention "engine temperature", are you referring to CTS?



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If it is a 4-wire sensor then the O2 sensor heater will be turned on when the engine temperature has reached a specific threshold and the engine has been running for at least 26 seconds. While the engine is warming up it will be running rich but the cold sensor will read low, when the sensor voltage increases above a predetermined level then the ECU knows that it has warmed up and it will become active.
A single wire sensor will only be active above a predetermined rpm threshold because they don't retain enough heat at idle.

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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Hi,

A quick question - I was trying to understand O2S activated is triggered by what algorithm - are you saying that it's ON once the air flow reaches 3.1 g/s?

 

Thanks. 



-- Edited by Victor on Monday 28th of March 2022 01:29:54 AM

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I agree a cracked exhaust manifold would be a possibility if the HO2 sensor was reporting lean (<200mV), but in this case the HO2 sensor is reporting full rich at 990mV and it is still over fuelling.

BTW, G13BB Jimny engines were also very prone to cracking exhaust manifolds. When I replaced mine some years (and ~200,000Kms) ago, I cut through the new manifold mounting flange between cylinders 2 & 3. This allows the casting to move a bit more with normal heating/cooling cycles and no signs of cracking since. I'm not familiar with the Vitara manifold, but it should work on similar style castings on other engines. Just be sure to keep the stud pattern balanced across the cut. See photos.

Feel free to repost these pictures elsewhere if you think they could be of help to others. It worked for me, but I can not take any responsibility for others workmanship.

Cheers...Bob

 



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Another cause of overfuelling with rthe O2 showing lean is a cracked or leaking exhaust manifold. Not uncommon on Vitaras

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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Just some observations.

The scan tool is indicating the HO2 sensor is reporting full rich at +990mV (for a zirconia O2 sensor) which is consistent with your observation of overfueling. The ECU should be desperately trying to pull the injector duty cycle back to correct this.

Somehow the ECU thinks the engine is running lean despite the HO2 sensor input. This would be consistent with an abnormally high MAF input (apparent high air flow volume). If the MAF checks out OK, it could be a faulty ECU. Could be shorted injector drivers, faulty MAF interface circuit or faulty HO2 interface circuit.

It could also be the ECU is seeing a wide throttle demand, some ECUs ignore O2 and MAF sensors under heavy acceleration and go full rich, so it would be worth checking the TPS circuit. I don't think this is the case as your scan tool is reporting 1.9 degrees which one would think is low throttle setting, but it is worth checking.

Or faulty (leaking) injectors or faulty fuel pressure regulator.

There is an interesting treatise on O2 sensors here: http://en.wikipedia.org/wiki/Oxygen_sensor

Good Luck...Bob



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Hi

I'll check the voltage and let you know. Should I check it while its running?



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I don't have any links for a supplier. Can you check the voltage at the MAF?



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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Do you have any links as to where I can obtain a replacement air flow meter

Part number - 13800-58B00



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Hi

The carmnan scan will use the units only provided by the manufacture. There is an option to change the units read to different units, but its will still always give figures in the units from the manufacture. i.e TPS can be changed to % from degrees but it still only gives the figure in degrees. I would say the maf is measured in the Suzuki style but i'm not sure what that is. I take it on your experience of normally being in Grammes per stroke



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Does the Carman state what units it uses? I would have to check but I think that the Suzuki figures are grammes/stroke rather than grammes/second.



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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60 g/s at 697 rpm?  Based on Rhino's figures that should/would be around 3 g/s.



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Just realised I missed out the reading from the MAF, what donut no

MAF - 60.60 g/s

Thanks



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