Post #1
which of the sensors/components of a magneti marelli 1AP10 causes the engine management light to come on?I'm having a problem with a hesitating engine at low revs and the engine light is on
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displaying posts 1 to 15 of 15
| Author | Subject: engine management light |
 bas_306gti
Regular  Location: Eindhoven Registered: 06 Sep 2012 Posts: 108 Status: Offline |
I'm having a problem with a hesitating engine at low revs and the engine light is on |
 Posted 17th Oct 2012 at 22:15
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Niall
Seasoned Pro  Location: Epsom Registered: 06 Jun 2012 Posts: 1,941 Status: Offline |
Post #2
posible from your symptoms is lambda sensor and coolant temp (although im not sure if the coolant temp will bring up the EML. My missus 206 coolant temp sensor went open circuit so defaulted to -40 degrees and that didnt give any warning at all!) |
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Posted 17th Oct 2012 at 22:25
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #3
Sounds like a lambda fault to me.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 18th Oct 2012 at 07:37
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,838 Status: Offline |
Post #4
last 4 lambda faults I rectified did not give EML.get it plugged in. ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 18th Oct 2012 at 11:37
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #5
welshpug! wrote: last 4 lambda faults I rectified did not give EML. get it plugged in. This is true, sometimes faulty lambdas do not illuminate the EML, and getting it plugged in is the correct advice. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 18th Oct 2012 at 14:26
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bas_306gti
Regular Location: Eindhoven Registered: 06 Sep 2012 Posts: 108 Status: Offline |
Post #6
Tested the system, the 3th injector receives no signal from the ECU, there's no break in the loom and there's 12V on the pin from the fuel/ignition relay. So my conclusion is a fault in ECU itself..... Has anybody one for sale? |
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Posted 18th Oct 2012 at 21:02
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #7
Rich_W on here sells unlocked ones, it may be of help to you.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 18th Oct 2012 at 22:24
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bas_306gti
Regular Location: Eindhoven Registered: 06 Sep 2012 Posts: 108 Status: Offline |
Post #8
I'm thinking about what caused the defect ECU, can a temporary short circuit in a injector cause a defect ECU, or is there a build in safety against this? |
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Posted 18th Oct 2012 at 22:38
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #9
Good question, I'm not actually sure on this one. I don't think we've come across the situation before so I would say it should be fine.I do see your point though, you wouldn't want to damage a second ECU using the same injector if it was indeed dodgy...  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 19th Oct 2012 at 07:15
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bas_306gti
Regular Location: Eindhoven Registered: 06 Sep 2012 Posts: 108 Status: Offline |
Post #10
The following is from a injection textbook:"A shorted injector winding causes high current through the injector and the PCM driver this high current may damage the injector driver in the PCM. In some PCM's the injector driver senses high current flow and rather than allawing injector driver to be damaged the shut the circuit off after a cooldown period the injector may allow operation" So a short circuit in a injector may damage the output unit in the ECU... I want to be sure I'm not damaging the other ECU so i'm installing another injector |
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Posted 21st Oct 2012 at 14:57
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smegal
Seasoned Pro  Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #11
Are you sure that the wires to the injectors are ok? ________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 21st Oct 2012 at 17:20
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bas_306gti
Regular Location: Eindhoven Registered: 06 Sep 2012 Posts: 108 Status: Offline |
Post #12
Wires are OK, tested zero resistance between injector pin 2 and pin 39 ECU and injector pin 1 and pin 4 fuel relay.There's also 12V on injector pin 1 when the ignition is on |
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Posted 21st Oct 2012 at 18:38
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bas_306gti
Regular Location: Eindhoven Registered: 06 Sep 2012 Posts: 108 Status: Offline |
Post #13
Eventually found out what was wrong... There was a cut in a wire to one of the coil packs. And if the ECU gets no signal back from a coil packs, it shuts of the injection of that cylinder. |
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Posted 27th Oct 2012 at 23:34
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #14
Interesting to know, well done for finding the fault.  So a simple loom fix and I guess it's all running good now? ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 28th Oct 2012 at 12:31
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bas_306gti
Regular Location: Eindhoven Registered: 06 Sep 2012 Posts: 108 Status: Offline |
Post #15
it's running OK now... (after a complete engine rebuild)It might also be interesting that a short circuit in a injector or in a coil (or in a wire to these components) doesn't damage the ECU immediately as I thought earlier. The injection/ignition (FET) drivers inside the ECU are protected against high currents. See the picture, on the right the injection drivers and on the left the ignition drivers. The steel clamps are for the temperature control (i think).  |
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Posted 28th Oct 2012 at 18:04
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