Help Please 300tdi fuelling issue

discool · Sep 17, 2020

Delwyn said:
is it on the accelterator pedal? looks like its been tampered with before as it has 6 wires, 2 cut off and 1 tee'd in going back towards the ECU, WTF. Would a bad TPS cause a non start?

I expect that the engine management control EMC would require to know the position before starting the engine, the D1 electrical manuals wiring diagram for EDC shows just four wires at the TPS, three go to the ECM.

Delwyn · Sep 17, 2020

discool said:
I expect that the engine management control EMC would require to know the position before starting the engine, the D1 electrical manuals wiring diagram for EDC shows just four wires at the TPS, three go to the ECM.

Thank you that makes perfect sense, its just a shame they are so expensive even second hand!

Hicap phill · Sep 17, 2020

Do all the injectors look the same? does 1 have an electric connector ?

Delwyn · Sep 17, 2020

Hicap phill said:
Do all the injectors look the same? does 1 have an electric connector ?

Yes, Injector 4 has an electrical connector.

discool · Sep 17, 2020

Delwyn said:
Thank you that makes perfect sense, its just a shame they are so expensive even second hand!

Throttle position sensor
The accelerator pedal is connected directly to sensor mounted in the pedal box. Driver demand isrelayed back to the ECM to increase or decrease
injected fuel quantity.
Incorporated in the sensor is a backup idle switch which the system will default to in the event of sensor
failure.
The above gives the impression that if the TPS the engine would still idle even if faulty... with a engine running of course. I understand that with a diagnostic EDC can be checked,,, perhaps it will be a basic one.

Delwyn · Sep 17, 2020

discool said:
Throttle position sensor
The accelerator pedal is connected directly to sensor mounted in the pedal box. Driver demand isrelayed back to the ECM to increase or decrease
injected fuel quantity.
Incorporated in the sensor is a backup idle switch which the system will default to in the event of sensor
failure.
The above gives the impression that if the TPS the engine would still idle even if faulty... with a engine running of course. I understand that with a diagnostic EDC can be checked,,, perhaps it will be a basic one.

Ah thanks, thats interesting, the plot thickens.

discool · Sep 18, 2020

Something else that could be of interest, its an item thats known to fail on other vehicles fitted with one, therefore the engine doesnt start.
As your issue was intermittant to start with, i'd start looking as the electrical connections under the bonnet, and with a circuit diagram a few voltage tests along the way.

Engine speed sensor
The engine speed sensor is an active inductive sensor mounted on the flywheel housing. Pulses from the sensor activated by radial slots in the flywheel give engine speed and position information to the ECM.

Delwyn · Sep 18, 2020

Thanks, I am picking up a TPS today to try, failing that I will be doing some more tests as suggested.

Delwyn · Sep 18, 2020

Update: The problem is the stop solenoid. However, this only works by putting a lead direct from the battery to its, not with the original lead. The original lead has 11.5v going to it but it doesnt work? Would the cause of the spluttering to a stop be a feed issue or the fact the plunger is goosed even thought the feed has 12v ish?

lynall · Sep 18, 2020

Delwyn said:
Update: The problem is the stop solenoid. However, this only works by putting a lead direct from the battery to its, not with the original lead. The original lead has 11.5v going to it but it doesnt work? Would the cause of the spluttering to a stop be a feed issue or the fact the plunger is goosed even thought the feed has 12v ish?

Well you could spend hours trying to trace it, ot just wire in your own hidden switch, simple security that only you know about.

Delwyn · Sep 19, 2020

If I was to put a new wire in from ignition does anyone know which wire I can tap into as it will need a live which doesnt lose power on startup, i.e. glowplugs/starter.

discool · Sep 19, 2020

Delwyn said:
If I was to put a new wire in from ignition does anyone know which wire I can tap into as it will need a live which doesnt lose power on startup, i.e. glowplugs/starter.

Find the ignition switch feeds where they enter into the top right at the front of the fuse board, (three wire sleeve tail with white, red/white and yellow) tap into the yellow, its the feed from position 2 of the ignition switch... Simples.

Pippadog · Sep 19, 2020

Delwyn said:
If I was to put a new wire in from ignition does anyone know which wire I can tap into as it will need a live which doesnt lose power on startup, i.e. glowplugs/starter.

Hi. I used the fuse in the fuse box for the ABS to get power for electric fan and train horn.

Delwyn · Sep 19, 2020

discool said:
Find the ignition switch feeds where they enter into the top right at the front of the fuse board, (three wire sleeve tail with white, red/white and yellow) tap into the yellow, its the feed from position 2 of the ignition switch... Simples.

Exactly the answer I needed, thanks

Delwyn · Sep 19, 2020

Pippadog said:
Hi. I used the fuse in the fuse box for the ABS to get power for electric fan and train horn.

Thanks

Help Please 300tdi fuelling issue

discool

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