205 Si warning light, advice needed...
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Thread: 205 Si warning light, advice needed...

  1. #1
    Fellow Frogger! lozenge's Avatar
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    Default 205 Si warning light, advice needed...

    hullo, during about seven hours on the road today
    in the Si, the orange warning light top right of tacho
    came on a couple of times for about ten minutes each time.
    car was running fine at all times.
    the handbook describes this as:
    Catalytic or diagnostic warning lamp.
    any clues?? thanks, Lo.

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    Fellow Frogger! Bluey's Avatar
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    Find the green female Bosch 2 pin connector. Research how to run a diagnostics check & carry out. Report back with codes.

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    Fellow Frogger! lozenge's Avatar
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    much thanks Bluey, I know the connector, I'll see if I can get the right help,
    and get back to you. ta.

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    1000+ Posts djvu205's Avatar
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    Quote Originally Posted by lozenge View Post
    much thanks Bluey, I know the connector, I'll see if I can get the right help,
    and get back to you. ta.
    I've got a homemade reader and some paperwork that explains the codes. Haven't used it for a long time but your welcome to try it. It's just a few wires and a switch that you need to connect to Green plug and count the orange light flashes to give you a number. Trouble is the codes can be a bit vague.

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    Fellow Frogger! lozenge's Avatar
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    great. I'll get in touch.

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    1000+ Posts djvu205's Avatar
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    i just ran the reader on my si and it showed error code 33 which translates to Air Flow sensor. I dont even know where the afs is on an si? the car doesnt have any bad symptoms but ill be checking into it.
    Last edited by djvu205; 16th February 2018 at 03:31 PM.

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    Fellow Frogger! lozenge's Avatar
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    Quote Originally Posted by Bluey View Post
    Find the green female Bosch 2 pin connector. Research how to run a diagnostics check & carry out. Report back with codes.
    today Lauree (djvu205) connected his homemade reader
    and it came up with 13 and 52.
    air temp sensor and automatic mixture adjustment system?
    what now?? (car still seemingly running fine)

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    1000+ Posts schlitzaugen's Avatar
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    Dude, when was the last time the computer was reset? If you don't know, who knows how long those codes have been there? Reset the computer, keep driving and see if they come back. Before that, those codes don't mean anything.
    ACHTUNG ALLES LOOKENPEEPERS

    Das computermachine is nicht fur gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitssparken. Ist nicht fur gewerken bei das dummkopfen. Das rubbernecken sightseeren keepen hands in das pockets-relaxen und watch das blinkenlights.

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    1000+ Posts djvu205's Avatar
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    Quote Originally Posted by schlitzaugen View Post
    Dude, when was the last time the computer was reset? If you don't know, who knows how long those codes have been there? Reset the computer, keep driving and see if they come back. Before that, those codes don't mean anything.
    Apart from yesterday when we closed the switch for + 10 sec at end of test it would have been reset last time battery was out or flat. From what i understand it can hold multiple codes so if the k light comes on the ecu stores a code. I fail to see how "those codes dont mean anything" as they actually do mean something, that is the purpose of the system, regardless of when they occured. The last code will be the last time the light came on.
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    1000+ Posts schlitzaugen's Avatar
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    Yes, but since then the fault may have been fixed and the computer not reset as far as you know (or as far as you told us).
    ACHTUNG ALLES LOOKENPEEPERS

    Das computermachine is nicht fur gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitssparken. Ist nicht fur gewerken bei das dummkopfen. Das rubbernecken sightseeren keepen hands in das pockets-relaxen und watch das blinkenlights.

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    Fellow Frogger! Bluey's Avatar
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    Quote Originally Posted by lozenge View Post
    today Lauree (djvu205) connected his homemade reader
    and it came up with 13 and 52.
    air temp sensor and automatic mixture adjustment system?
    what now?? (car still seemingly running fine)
    Code 13
    First up, check the continuity & resistance of the Air Temp sensor (AT)
    Air Temp sensor is located inside the Air-Flow Meter (AFM). It uses pins 4 & 5.
    I have two Motronic AFMs (0 280 202 202) to hand and they both read 1.9K Ohms @ 25*C ambient temp.
    This should at least tell you if the sensor itself is healthy.
    Secondly check the connector. Make sure the pins have good contact and arenít walking themselves out the back of the connector when you push it on.

    With the codes cleared, continue driving it. If it's a hard fault in the air temp sensor then A. it should have been evident through the resistance test and B. it should trigger the CEL within minutes. Intermittant faults usually show up within 1-3 hours of driving.

    The next step is to check the wiring continuity between the AFM & the ECU but do the resistance check and wait for a CEL before moving to that next step.


    Code 52
    This is an exhaust mixture related code. People generally interpret codes 51 & 52 as meaning that their oxygen sensor is faulty where in fact the true meaning is that the Air-Fuel Ratio (AFR) voltage that the ECU is receiving does not match the reading the ECU expects for the outputs (Injectors, Ignition) it is producing.

    This code can be triggered by:
    O2 sensor,
    Air temp sensor
    Coolant temp sensor
    Air flow meter
    Induction air leak
    Exhaust leak
    Throttle position sensor not calibrated
    Ignition misfire (faulty plug, lead, dist. cap, rotor, coil)


    I would sit tight on code 52 until you have eliminated your AT related CEL.
    lozenge and Tom_95 like this.

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    much thanks Bluey for your generosity in providing this
    information and advice. I'll follow it up.
    regards, Lo.

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    1000+ Posts cam85's Avatar
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    Just fyi

    I dont think the SI has an airflow meter.

    I wohld look at the O2 and also the sensor on the slam panel that looks like its been an aftermarket fir but is actually factory.

    Is the car driving 'fine'?
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    Fellow Frogger! lozenge's Avatar
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    Quote Originally Posted by cam85 View Post
    Just fyi

    I dont think the SI has an airflow meter.

    I wohld look at the O2 and also the sensor on the slam panel that looks like its been an aftermarket fir but is actually factory. Is the car driving 'fine'?
    thanks Cam. um yeah, we couldn't find one either. more investigations to follow...
    yes, the car still herbing along nicely, apart from a loose baffle in the back muffler.

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    Quote Originally Posted by cam85 View Post
    I dont think the SI has an airflow meter.
    My Bad. Look around the throttle body for a 2 wire air temp sensor and carry out a resistance check.

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    Sensor on the slam panel is MAP sensor.

    Quote Originally Posted by cam85 View Post
    Just fyi

    I dont think the SI has an airflow meter.

    I wohld look at the O2 and also the sensor on the slam panel that looks like its been an aftermarket fir but is actually factory.

    Is the car driving 'fine'?

  17. #17
    Fellow Frogger! lozenge's Avatar
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    much thanks Bluey and Graham, the quest continues.

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    1000+ Posts djvu205's Avatar
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    Found this while looking for monopoint G5 injection and ignition info it relates directly to the BDY motor
    Attached Thumbnails Attached Thumbnails 205 Si warning light, advice needed...-scan0001.jpg   205 Si warning light, advice needed...-scan0002.jpg  

  19. #19
    1000+ Posts djvu205's Avatar
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    I think this is most likely the IAT sensor going off the info in the Haynes manual it says it is screwed directly into the intake manifold.
    Attached Thumbnails Attached Thumbnails 205 Si warning light, advice needed...-img_20180221_114400581.jpg  

  20. #20
    Fellow Frogger! lozenge's Avatar
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    very good. much thanks for your detective work, Lauree, I'll be in touch.

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