Help! Diesel Arosa not starting!

[Muttley]

basstard wrote
I don't really think the ecu won't start the engine because of a bad connection or a shot sensor,,, these are intermittent faults usually and the ecu uses standard values when it doesn't get data from the sensor,,, I'm pretty sure it's this way that it works,,,

There are some faults that will cause the ECU to shut the engine down, even if you're in motion!

If the engine speed sensor G28 fails, the engine will shut down, whatever speed you're doing! Fortunately this seems to be a robust sensor

If the accelerator position sensor G79 fails, the ECU drops the engine to a high idle speed, so you can potter to the nearest garage, and then shuts off the accelerator signal, so you only have standard idle.

If the G80 sensor fails, the engine won't start - G80 in PD engines recognises which cylinder needs to be fired so as to activate the correct solenoid valve in the PD unit. I assume if it fails while you're in motion the ECU just keeps the established cylinder order.

The ECU itself can fail in ways that will shut the engine down. This can occur if the ECU has been opened for chipping.

An immobiliser fault will prevent the engine starting.

At least, that's what I understand from reading the few tech manuals that I've been able to find...

 

[basstard]

If the engine speed sensor G28 fails, the engine will shut down, whatever speed you're doing! Fortunately this seems to be a robust sensor

Yeah you're right,,, in this case the ecu can't use any "standard" values,,,

If the accelerator position sensor G79 fails, the ECU drops the engine to a high idle speed, so you can potter to the nearest garage, and then shuts off the accelerator signal, so you only have standard idle.

Ecu assumes you're on no-gas pedal to be on the safe side,,,

If the G80 sensor fails, the engine won't start - G80 in PD engines recognises which cylinder needs to be fired so as to activate the correct solenoid valve in the PD unit. I assume if it fails while you're in motion the ECU just keeps the established cylinder order.

Another case in which the ecu can't use standard values,,,

At least, that's what I understand from reading the few tech manuals that I've been able to find...

Manuals which I [pretty please] would like to have,,,

 

[Fidge]

Right got my vag com working and earlier got 2 fault codes,

but just tried to retrieve codes again and it keeps coming up no faults found!

BUT she still wont start!??? Any Ideas?

cheers

 

[basstard]

clearing the fault codes doesn't mean the car should start!!

have you tried what I said? [key moving into ignition barrel and the starter trick?]

 

[Fidge]

clearing the fault codes doesn't mean the car should start!!

have you tried what I said? [key moving into ignition barrel and the starter trick?]

Thats just it I didn't clear the faults as I don't have a registered version but the codes have just dissappeared now!? Surely they should still be there? they dont clear themselves do they?

I don't think its the ignition cos the switch activates the starter motor no problem! Still have the flashing plug light but no faults?

cheers

 

[basstard]

I don't think its the ignition cos the switch activates the starter motor no problem! Still have the flashing plug light but no faults?

It did the same on mine, the starter turned no prob, yet it was the ignition switch. the starter it's not the only thing controlled by the ignition switch!!

And no, fault codes don't clear themselves,,,

 

[Fidge]

It did the same on mine, the starter turned no prob, yet it was the ignition switch. the starter it's not the only thing controlled by the ignition switch!!

And no, fault codes don't clear themselves,,,

Checked on VAG COM again and still no fault codes! Checked to see if any power was being fed to plugs and found no charge atall so looks like the ignition has been deactivated!?

 

[basstard]

You don't need glow plugs to start the engine at temps higher than 5°C so I guess it's normal you don't have any current to the plugs,,,

what I think is that the ignition switch gives the signal to the relays that activate the fuel injection on start up [the N249 valve or something like that,,,]

 

[Fidge]

You don't need glow plugs to start the engine at temps higher than 5°C so I guess it's normal you don't have any current to the plugs,,,

what I think is that the ignition switch gives the signal to the relays that activate the fuel injection on start up [the N249 valve or something like that,,,]

One of the fault codes I retrieved yesterday I'm sure mentioned the N249 valve on cylinder 1 or something! Still no faults found n VAG-COM now tho! Maybe the valve could need replacing then?

 

[basstard]

The N249 should be only one, near the engine pump if I got it right,,, and this is for non-pd engines, could be the same for pd's but I can't assure you,,,
BTW, do you know which pump is on the 1.4?

It could be the N249, the engine would turn but if the valve wouldn't want to open, then you'd have no fuel injected.
I don't know how much a N249 is. Ask someone with ETKA [I didn't have the time to put it on this pc yet] to look at where the N249 is on your car, maybe stoneyford can help you, then take a look at it,,, take it off, clean it a bit, see if the part no on your leon is the same as the arosa and if yes swap them to try.

good luck.

 

[Fidge]

The N249 should be only one, near the engine pump if I got it right,,, and this is for non-pd engines, could be the same for pd's but I can't assure you,,,
BTW, do you know which pump is on the 1.4?

It could be the N249, the engine would turn but if the valve wouldn't want to open, then you'd have no fuel injected.
I don't know how much a N249 is. Ask someone with ETKA [I didn't have the time to put it on this pc yet] to look at where the N249 is on your car, maybe stoneyford can help you, then take a look at it,,, take it off, clean it a bit, see if the part no on your leon is the same as the arosa and if yes swap them to try.

good luck.

Cheers mate! Not sure what pump it is!? Anyone else help with this?

 

[Cubix]

Have you looked at the fuel shut of valve/solenoid? If there is no power to the valve ther fuel will not get through to the engine! No fuel no start. Best thing is to check the wiring connection on this valve/solenoid where ever it is. It is normally near the glowplugs and the fuel pump.

Maybe the "N" numbered valve is this shut of valve?

Just a thought.

 

[basstard]

Maybe the "N" numbered valve is this shut of valve?

 

[Fidge]

Have you looked at the fuel shut of valve/solenoid? If there is no power to the valve ther fuel will not get through to the engine! No fuel no start. Best thing is to check the wiring connection on this valve/solenoid where ever it is. It is normally near the glowplugs and the fuel pump.

Maybe the "N" numbered valve is this shut of valve?

Just a thought.

Anyone have any diagrams of the engine showing where everything is please?

 

[basstard]

try pm'ing stoneyfordNI he might help,,,

hey, let us know when you solve the problem!!

 

[Fidge]

try pm'ing stoneyfordNI he might help,,,

hey, let us know when you solve the problem!!

Yeah will do! Looks like she'll be off to the stealers soon!

 

[basstard]

Don't do it,,, you can do it yourself and spend just the cost of the valve,,, the stealer will charge you a ridiculous amount of work which absolutely isn't there,,, this is obviously unless it's under warranty,,,

 

[Fidge]

Don't do it,,, you can do it yourself and spend just the cost of the valve,,, the stealer will charge you a ridiculous amount of work which absolutely isn't there,,, this is obviously unless it's under warranty,,,

No its not under warranty but I still don't know what it is and there's still no fault codes coming up so I'm lost! It might not be the n249 valve.

 

[basstard]

Let the b*stards do their job and sort it out themselves then,,,

 

[Fidge]

UNBELIEVEABLE! She just started up! And now a fault code has flashed up! This is it:

VAG-COM Version: Release 409.1-US


Chassis Type: 6H - Seat Arosa
Scan: 01,02,03,08,15,17,25,35

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 045 906 019 T
Component: l,4l R3 EDC 0000SG 1209
Coding: 00002
Shop #: WSC 06441
VSSZZZ6HZ4R002356 VWZ1Z0C2537355
3 Faults Found:
19561 - Valve for Intake Manifold Flap (N239): Open or Short to Ground
P3105 - 35-00 - -
18027 - Shareware Version. To Decode all DTCs
P1619 - 35-00 - Please Register/Activate
17957 - Shareware Version. To Decode all DTCs
P1549 - 35-00 - Please Register/Activate
Readiness: N/A

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 6X0 907 379 B
Component: ABS 30 IE CAN V004
Coding: 05603
Shop #: WSC 00000
No fault code found.

Took her for a drive to charge up the battery and she felt really sluggish and slower than usual but this passed after about 20 mins and now she is driving ok, but now when the engine is running or the ignition is on the valve at the back of the engine next to the water bottle is clicking like mad! It looks like the N75 valve on my Leon cupra, could this be the N239 valve as in the fault code??

cheers