idle problems or ecu problems

[geoffdown]

hi guys i have now narrowed it down i had problem with car first of all with no mil light then disconnect sensors to see if it would record a fault code and when i first started out it was showing all clear (55 i think ) when i disconnected needle lift sensor (or injector no.1) and when i checked fault code with paper clip that code for that came up and tryed to clear and wouldnt but cleared it self after a day or two but no mil light on, so went around most sensors and the samething until i got to the engine temp sensor after disconnecting that 1 the mil light came on and stayed on looked at fault code and yes was saying engine coolant sensor but the light would not go out so i un pluged injector no1 again read codes with paper clip and there were two codes temp sensor and injector no 1 tryed to clear again but no would not clear either fault codes so ran it for a couple of days and the injector no1 code went but left the temp sensor so i went to euro car parts and £10 later got new sensor fitted it and guess what still got mil light on all the time and fault code for the temp sensor so took dash apart and got to the ecu under the heater controls found the two wires that go to the engine temp sensor and checked for continuaty both wires r fine but still after disconnecting the ecu harness and puting back together still got mil light on with temp sensor code now i am thinking its got to be the ecu as new sensor and checked the wire to the sensor and both wire r ok or have i missed something the other wired thing is i cant read my codes the same way with the paper clip as every1 else can which in turn means i cant clear them .
I have a 2000 Xreg terrano with bosch ecu and bosch pump and maf but no egr valve has any 1 got the same age terrano with bosch fuel system how do they check codes and clear them also does any1 have a bosch ecu from a 2000 plate kicking around i could try sorry for the long message i have finished now :clap

 

[kwondo]

just a thought if you disconnected the battery overnight would it clear the fault codes from the ecu, dont know if the ecu has a battery retentative eprom. although if it has an eeprom that would'nt clear it? would have to reprogram blip key if you did this though, wish i could help more...good luck

 

[dan]

Please tell me you disconnected the battery before unplugging the ecu??

Open Bonnet

Close all doors, take key out of ignition

Wait until it goes to sleep (20-30 mins)

Disconnect battery.

Leave for 2-6 hours.

It SHOULDN'T remember the fault. If it comes up again, it may have spiked the ECU - assuming the battery was connected.

I am booked up for the next week or so, but can put her on the diag and turn the light off if you need it - may be going through devon in around 10 days time or so.

 

[makeitfit]

errm,stupid question time :augie
What happens if one were to unplug the ecu without disconnecting the battery :nenau
Not that I would have done such a thing

 

[geoffdown]

Please tell me you disconnected the battery before unplugging the ecu??

Open Bonnet

Close all doors, take key out of ignition

Wait until it goes to sleep (20-30 mins)

Disconnect battery.

Leave for 2-6 hours.

It SHOULDN'T remember the fault. If it comes up again, it may have spiked the ECU - assuming the battery was connected.

I am booked up for the next week or so, but can put her on the diag and turn the light off if you need it - may be going through devon in around 10 days time or so.

i remember when i had a pug 307 the car was left for bout 1 hr before i disconneted battery but this was happenig before i disconnected the battery thats y i unpluged the ecu think the prevous owner has done something like that i bought nissan lead and downloaded ecutalk but it wont talk to the car which is also pointing me towards f**ked ecu but new from nissan is £700 ish and cant find any ecus on ebay with same model no. ecu:doh where bouts in cornwall r u again and how much would u charge for that

 

[lacroupade]

errm,stupid question time :augie
What happens if one were to unplug the ecu without disconnecting the battery :nenau
Not that I would have done such a thing

Lyin ba5tard! LOL I unplugged and plugged my ECU about ten times putting the Tunit on as well.....fear not Blodwyn. :lol

 

[makeitfit]

I was thinkin' of YOU doing just that :lol Nice to know YOU'VE done no harm to YOUR ecu :augie

 

[lacroupade]

I was thinkin' of YOU doing just that :lol Nice to know YOU'VE done no harm to YOUR ecu :augie

Yes that could certainly reassure any IDIOT that has ALSO done the SAME THING without thinking. :augie :lol

 

[geoffdown]

ok guys if its not ****ed ecu y cant i clear the faults and i have new temper sensor in and checked the wires back to the ecu and the lovely ecu is still sayings its the temp sensor or wiring what else could it be

 

[dan]

First things first, do you have read only software? Many mainstream are just code readers. They will tell you what it is, so you can take it to a garage.
If so, would explain why you cannot turn the light off, only see why it is on.

 

[geoffdown]

First things first, do you have read only software? Many mainstream are just code readers. They will tell you what it is, so you can take it to a garage.
If so, would explain why you cannot turn the light off, only see why it is on.

software is a down load of internet its called ecutalk and u can study sensor reading if u can get it to talk to the car .i thought with the terrano u can read and wipe code with a paper clip but when i try to wipe the way every1 else can i can not
where bouts in cornwall r u again and how much to just hock up the computer other question do u have a nissan lead with laptop or a hand held device if so which 1 do u have

 

[lacroupade]

Geoff I assume you can read the EML with the paper clip method? If so then its a simple step to delete them all again...just make the short again and hold it for a few seconds as I recall but the download instructions are clear and correct...then it would only be returning when you started the engine again.

 

[geoffdown]

Geoff I assume you can read the EML with the paper clip method? If so then its a simple step to delete them all again...just make the short again and hold it for a few seconds as I recall but the download instructions are clear and correct...then it would only be returning when you started the engine again.

thats the problem i can read the mil light only when the paperclip is in if i take it out like the download says it just stops flashing so that also means that how the download says to clear them i cant do as the paper clip has to be left in to read the code on ur terrano i think it should be like mine a white 16pin plug if so do u do what the download says if it works for u then i must have someting wrong with either the 16pin plug or the ecu

 

[lacroupade]

thats the problem i can read the mil light only when the paperclip is in if i take it out like the download says it just stops flashing so that also means that how the download says to clear them i cant do as the paper clip has to be left in to read the code on ur terrano i think it should be like mine a white 16pin plug if so do u do what the download says if it works for u then i must have someting wrong with either the 16pin plug or the ecu

Surely you put it in, read the code, then put it back in again and it clears it...least thats what I thought....

so you did this>....?

Erasing Codes from ECM Memory.
Switch ignition on.
Bridge data link connector (DLC) terminals IGN and CF-CHK Fig. 2.
Wait 2 seconds.
Disconnect bridge wire from data link connector (DLC) Fig 2.
Check that MIL flashes.
Bridge data link connector (DLC) terminals IGN and CHK Fig. 2.
Wait 2 seconds.
Disconnect bridge wire from data link connector (DLC) Fig. 2.
Switch ignition OFF.
Repeat checking procedure to ensure no data remains in ECM fault memory.

 

[geoffdown]

Surely you put it in, read the code, then put it back in again and it clears it...least thats what I thought....

so you did this>....?

Erasing Codes from ECM Memory.
Switch ignition on.
Bridge data link connector (DLC) terminals IGN and CF-CHK Fig. 2.
Wait 2 seconds.
Disconnect bridge wire from data link connector (DLC) Fig 2. if i disconect after 2 secs the fault codes will not flash mil light just stays on but if i keep it bridge then i can read the mil light
Check that MIL flashes.
Bridge data link connector (DLC) terminals IGN and CHK Fig. 2.
Wait 2 seconds.
Disconnect bridge wire from data link connector (DLC) Fig. 2.
Switch ignition OFF.
Repeat checking procedure to ensure no data remains in ECM fault memory.

hope that makes sense above

 

[lacroupade]

hope that makes sense above

Ray might be able to comment....certainly seems weird....can you post a photo of your connector so he can be certain what he's commenting on if/when he does, cos there are differences as you've said?

 

[geoffdown]

ok every1 the prolem continues i have bought a code reader and it wipes to it scans the ecu finds the protcol reads the memory and saids no faults but the mil light is on all the time now, that was on friday so i disconnected inj No.1 sensor startred thrned of and tryed to read with the code reader again no faults i then drove the car sat and it was not happy on full throttle under load then monday towed caravan back and was really bad on hills the power was surgeing then whe back home pluged code reader in and 1 fault came up tryed to look at the code and all i got was N/A on the screen before wiping it i put paperclip in to read and got 01/03 coolant sensor (which has been there since the mil light came on) 03/04 NEEDLE LIFT SEN 02/01 F/INJ TIMG F/B
now since i cant reset the codes with the paperclip i used the code reader and after reseting the codes only 1 went which is 02/01 F/INJ TIMG F/B i have read somewhere that code 01/03 means either coolant sensor faulty (i have replaced mine) wiring fault it the coolant sensor circuit (i hsve checked my circuit and no problem) or a fault ecm or other wise known as ecu. does ay1 else have any ideas thanks

 

[rayf3262]

i used the code reader and after reseting the codes only 1 went which is 02/01 F/INJ TIMG F/B i have read somewhere that code 01/03 means either coolant sensor faulty (i have replaced mine) wiring fault it the coolant sensor circuit (i hsve checked my circuit and no problem) or a fault ecm or other wise known as ecu. does ay1 else have any ideas thanks

what does the live sensor data in ECUtalk show for the coolant temp. etc...?

 

[geoffdown]

what does the live sensor data in ECUtalk show for the coolant temp. etc...?

i still cant get it to comuecate with the com port i bought a cheap code reader now u wont belive this but after the above i went for a spin with mil light on and when i can back i read the codes with the paperclip and got 05/05 no faults so started engine up and mil light has just gone out but i still get a funny idle when i let foot off throttle not all the time so whats happened to make the mil light go out can these bosch ecu be chiped as i dont know if some1 has put a bad map in or something lioke that

 

[clivvy]

i still cant get it to comuecate with the com port i bought a cheap code reader now u wont belive this but after the above i went for a spin with mil light on and when i can back i read the codes with the paperclip and got 05/05 no faults so started engine up and mil light has just gone out but i still get a funny idle when i let foot off throttle not all the time so whats happened to make the mil light go out can these bosch ecu be chiped as i dont know if some1 has put a bad map in or something lioke that

perhaps it need a bit more time to adjust an configure after being cleared?