ECU v OBD

radgethedog · Apr 23rd, 2011, 20:07

Hi all. Again!

Right, my battery is fully charged so I do not have a voltage issue. At static anyway, as the damn thing doesn't start... however...

Quick straw poll really- if two seperate OBD's have been tried and the system refuses to fez up as to whats up with it, or even allow a connection, are we looking at a new ECU??

2001 ME7 T5

Chris_Rogers · Apr 23rd, 2011, 21:46

Have you made sure there are no blown fuses?

radgethedog · Apr 24th, 2011, 09:20

checked everything mate. twice. at least.

Chris_Rogers · Apr 24th, 2011, 09:44

Is the main engine relay FMA2 in the box behind the air filter operating when you turn the ignition on?

Does the fuel pump run?

radgethedog · Apr 24th, 2011, 10:04

just speaking to mike re. fma2.. off to check that now.

fuel pump works, and having heath robinsoned a pressure guage, pressure is fine too.

mike on his way up, so i'll keep you posted

tim

Chris_Rogers · Apr 24th, 2011, 10:07

Check the green wire at any of the fuel injectors, should read battery volts to ground.

radgethedog · Apr 24th, 2011, 12:20

Chris,

mike plugged in and came up with the following

- CEM 1A62
- CEM 1A5D

so either no power supply to ecu, no earth or open circuit...

The Hooded Claw · Apr 24th, 2011, 12:25

Quote:

Originally Posted by radgethedog

Chris,

mike plugged in and came up with the following

- CEM 1A62 = Communication with the engine control module (ECM). Signal missing
- CEM 1A5D = Communication with the electronic throttle module (ETM), signal missing

so either no power supply to ecu, no earth or open circuit...

See Above IN RED!!!

Quote:

At static anyway,

Pretty Obvious Question .... Does it start with a "Jump" ???.... A Failed Battery (With low Cranking Amps) can cause all sorts of "Odd" problems My Old P38 Rangie used to throw up "Gearbox Fault" I eventually tracked it down to a duff Battery cell.. (It just wasn't pushing the correct amount of Amps out to the various ECU's ect ...) taking all the "Available Amps" to Crank the engine & run ect...

radgethedog · Apr 24th, 2011, 12:29

yeah... got that, im on it!

tashlad666 · Apr 24th, 2011, 12:59

I had trouble with a car i bought last weekend, the kid jumped it off before i got there and had it on tick-over, it would rev and behave perfect at standstill, but when i got it rolling it was cutting out and dash going mental.

rang a dealer and they said try battery, got it changed at side of road and been fine for last 300 miles, so seems like dodgy battery's can cause havoc!

Apr 23rd, 2011, 20:07	#1
radgethedog Member Last Online: Feb 22nd, 2014 13:07 Join Date: May 2009 Location: harrogate	ECU v OBD Hi all. Again! Right, my battery is fully charged so I do not have a voltage issue. At static anyway, as the damn thing doesn't start... however... Quick straw poll really- if two seperate OBD's have been tried and the system refuses to fez up as to whats up with it, or even allow a connection, are we looking at a new ECU?? 2001 ME7 T5 __________________ Understeer, Oversteer, Wombling Free..

Apr 24th, 2011, 09:20	#3
radgethedog Member Last Online: Feb 22nd, 2014 13:07 Join Date: May 2009 Location: harrogate	checked everything mate. twice. at least. __________________ Understeer, Oversteer, Wombling Free..

Apr 24th, 2011, 10:04	#5
radgethedog Member Last Online: Feb 22nd, 2014 13:07 Join Date: May 2009 Location: harrogate	just speaking to mike re. fma2.. off to check that now. fuel pump works, and having heath robinsoned a pressure guage, pressure is fine too. mike on his way up, so i'll keep you posted tim __________________ Understeer, Oversteer, Wombling Free..

Apr 24th, 2011, 12:20	#7
radgethedog Member Last Online: Feb 22nd, 2014 13:07 Join Date: May 2009 Location: harrogate	Chris, mike plugged in and came up with the following - CEM 1A62 - CEM 1A5D so either no power supply to ecu, no earth or open circuit... __________________ Understeer, Oversteer, Wombling Free..

Apr 24th, 2011, 12:29	#9
radgethedog Member Last Online: Feb 22nd, 2014 13:07 Join Date: May 2009 Location: harrogate	yeah... got that, im on it! __________________ Understeer, Oversteer, Wombling Free..

Apr 23rd, 2011, 21:46	#2
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	Have you made sure there are no blown fuses?

Apr 24th, 2011, 09:44	#4
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	Is the main engine relay FMA2 in the box behind the air filter operating when you turn the ignition on? Does the fuel pump run?

Apr 24th, 2011, 10:07	#6
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	Check the green wire at any of the fuel injectors, should read battery volts to ground.

Apr 24th, 2011, 12:59	#10
tashlad666 Member Last Online: Feb 28th, 2017 20:10 Join Date: Apr 2011 Location: Nostell, Wakefield	I had trouble with a car i bought last weekend, the kid jumped it off before i got there and had it on tick-over, it would rev and behave perfect at standstill, but when i got it rolling it was cutting out and dash going mental. rang a dealer and they said try battery, got it changed at side of road and been fine for last 300 miles, so seems like dodgy battery's can cause havoc!

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