Sprinter 310 D startet nicht mehr - Vorheizanzeige schaltet sich nicht aus

Mercedes Sprinter 1 (Typ T1N, Baumuster W901-W905) & VW LT 2 - ab 1995 bis 2006
BONNET
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Re: Sprinter 310 D startet nicht mehr - Vorheizanzeige schaltet sich nicht aus

#16 

Beitrag von BONNET »

 Themenstarter

Thank you , i also read that the 312D before 96 had no antistart system . Shouldn’t I try to find such an older ECU that would both solve my start issue + add 20 hp ? Do you think it would mount well on my 310 ? Thks
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Re: Sprinter 310 D startet nicht mehr - Vorheizanzeige schaltet sich nicht aus

#17 

Beitrag von Vanagaudi »

This is possible, but I got another idea:

The engine shut-off valve is part of the immobilizer, but also required to shut-off engine after regular switch-off by driver.
It is possible that ECU will sense solenoid of shut-off valve and in case it's not present to show driver an immobilizer fault by continued light-up of glow plug indicator.

In our thoughts we have to separate this functions. I assume there is a general problem within the circuit of the shut-off valve. I came to this idea because your engine stopped suddenly while driving on highway. Reason could be a loose contact of either the wire to connect shut-off valve with ECU, or the return line especially grounding cables from engine to frame and further to battery. You may check this by a temporary connected indicator bulb to shut-off valve.

As you're missing a click sound after heating up glow plugs, there could also be a problem with ECU power supply. At present I don't have any idea, which relay in drivers compartment may cause this click sound you're missing. Still it will take some time to find out.

For the time being you may disconnect your shut-off valve and instead connect it to ignition line as shown at T4-wiki in picture "T4 ohne WFS bzw. mit MSG". This will drive your shut-off valve by Kl.15 (Ignition). Immobilizer is out of control and probably will show an error. You may ignore this. But your engine should start an run until shut-off by ignition key.
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BONNET
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Re: Sprinter 310 D startet nicht mehr - Vorheizanzeige schaltet sich nicht aus

#18 

Beitrag von BONNET »

 Themenstarter

Hello Helmut,

When it stopped on the motorway , i am quite sure that it was an electrical problem somewhere , temporary solved solved by touching the wires below the driver seat (MAybe the fuel pump relay) .. So there is definitely an electrical unstability here that i have to solve , maybe by replacing the whole wiring harness if i can buy a new one.

Now the new problem, that i probably created myself while trying to solve the first one above (i dismanteled all the fuse box and Temic + cable of antistart..) is that permanent pre heating light and no more "clic" happens when trying to start the engine , that is probably due to the antistart circuit ... i will mount the old solenoid of the injection pump because it is working well under 12V .
on one hand i am trying to get the diag software HHTWin to test this Sprinter , on the other hand i would be happy to definitely remove all the antistart system , probably by changing the ECU as i saw a company in Poland that seems to propose this (https://auto24parts.com/pt_PT/p/Central ... 363#option) with the option : UNLOCK , IMMO OFF. But i would like to be sure it will work before paying 600 €...

I am not sure to fully understand your previous proposal with the shut-off solenoid valve : Do you mean that i could directly create a 12V wire from battery to the pump with a switch inside the dashboard ? This way i could unlock the pump manually and start or stop the engine , whatever the TEMIC does ? Easy to try i guess..
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Re: Sprinter 310 D startet nicht mehr - Vorheizanzeige schaltet sich nicht aus

#19 

Beitrag von sprinter75 »

Guten Tag,

Welche nummer sind auf Temic Immobox und Bosch Mtorsteuergerät ?

MfG Sprinter75
Brauchen Sie Hilfe bei Wegfahrsperre oder Schlüssel Probleme Mercedes Sprinter/VW Crafter (und auch veile andere MB Modelle wie w163,w638,w168,w202,w210 usw) , oder Start Error Probleme, starten Sie ein Thema und benachrichtige mich in Privat Nachricht.
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Re: Sprinter 310 D startet nicht mehr - Vorheizanzeige schaltet sich nicht aus

#20 

Beitrag von Vanagaudi »

Vanagaudi hat geschrieben: 29 Jun 2024 14:50As you're missing a click sound after heating up glow plugs, there could also be a problem with ECU power supply. At present I don't have any idea, which relay in drivers compartment may cause this click sound you're missing. Still it will take some time to find out.
Your engine is OM602.980 and according to VIN the engine control unit is a MSA25. To this configuration there is the relay K45 required which drives the glow plug indicator lamp. This relay K45 is driven by ECU Pin53 wire 1,0mm² GN/YE. ECU Pin53 switches to ground in case K45 should be activated. I don't have any idea about location of K45 but probably on central electric board. I'm sure that this relay K45 causes the click sound you heard when the glow plug indicator lamp had been switched off.

Other side of K45 coil is connected to K5 which switches power source for engine control circuits. K5 switches on main power source for ECU A20 (Pin55 and Pin37), Exhaust Gas Recirculation EGR Y44, diesel injection pump Y45 and K45. K5 is driven by ECU Pin26 wire 1,5mm² BR/BL. ECU Pin26 switches to ground in case K45 should be activated.
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Re: Sprinter 310 D startet nicht mehr - Vorheizanzeige schaltet sich nicht aus

#21 

Beitrag von Vanagaudi »

BONNET hat geschrieben: 29 Jun 2024 23:59When it stopped on the motorway , i am quite sure that it was an electrical problem somewhere , temporary solved solved by touching the wires below the driver seat (MAybe the fuel pump relay) .. So there is definitely an electrical unstability here that i have to solve , maybe by replacing the whole wiring harness if i can buy a new one.
As you car doesn't have any electrical fuel pump probably you touched K5. I don't know location, but this should be a heavy relay and probably is located below driver's seat. Instead of changing whole wiring harness you may clean or replace some of the cable shoes. Those flat 6mm connectors commonly used relays pins loose their tension on high age. You may replace those and while doing this, check if copper wire had been oxidized. If this had happened, you need to replace about 10cm of this wire. To do this there are repair wires available with cable shoes attached. This pig tails needs to be attached by soldering connectors to remaining cable harness.
Für (Folge-) Schäden aller Art übernehme ich keine Haftung. Alle einschlägigen (Sicherheits-) Vorschriften sind zu beachten. Im Zweifelsfalle grundsätzlich einen Fachmann fragen bzw. die Arbeiten von einer Fachfirma ausführen lassen.
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