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Old 01-22-2020, 06:43 PM   #31
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Default Re: Engine stops on freeway I stuck on shoulder

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Originally Posted by Midwestdrifter View Post
Even if this was the case, unplugging the connector should then allow a start.

Unplugged TCM still no start


Having trouble getting the TCM out. Any pointers?
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Old 01-22-2020, 07:04 PM   #32
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Default Re: Engine stops on freeway I stuck on shoulder

If you can't even scan the engine, why are u messing with the tcm?
U Really need to slow down and get methodical.
Your sudden engine stop points to a broken connection/wire, though a sensor failure should show up on the scanner.
In your situation i would study the wiring diagram and make sure you had 12v where you are supposed to, key off, key on, key start.
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Old 01-22-2020, 08:07 PM   #33
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Default Re: Engine stops on freeway I stuck on shoulder

You supplied a couple of random obd codes which COULD correlate to this thread - https://sprinter-source.com/forum/sh...ad.php?t=28842 obviously there was no documentation to success, but perhaps some nuggets?
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Old 01-25-2020, 11:48 PM   #34
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Default Re: Engine stops on freeway I stuck on shoulder

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In your situation i would study the wiring diagram and make sure you had 12v where you are supposed to, key off, key on, key start.
Thanks Patrick

With key in #2 or #3 position

The Starter Motor Relay 12v switch supply reads 3.4 volts

The Fuel Pump Relay 12v switch supply reads 0 volts

Both relays are supplied 12 volts through splice S108 with the key in #2 or #3 position

2004 & 2005 service manual 8W-91 Connector/Ground/Splice Location

Page 8W-91-11 identification page skips S108 totally.

Anybody know where splice S108 is located, or the where 12 volt supply originates from?

S108 is not under the seat because both relay 12v supply wires go through the floor and become part of the large harness that runs to the dash behind the battery.

With the Starter Motor Relay removed, jumpers to on and the key in the start position I get the sweet sound of the starter turning the engine over.


Any ideas?
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Old 01-26-2020, 02:03 AM   #35
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Default Re: Engine stops on freeway I stuck on shoulder

R u reading those voltages at the key switch wiring harness or at the respective relays?
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Old 01-26-2020, 02:25 AM   #36
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Default Re: Engine stops on freeway I stuck on shoulder

Those are some funky readings..

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The Fuel Pump Relay 12v switch supply reads 0 volts

Any ideas?
Remind us.. when you go to start do you feel a click in the starter relay? I forget if the ecm will even allow the motor to start if the high pressure pump isn’t seeing the low pressure it needs to fire. If not, this could be your issue as you need low pressure. But that 3.4v at starter relay is just weird leading me to believe ground issues which you’re already on to.
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Old 01-26-2020, 01:34 PM   #37
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Default Re: Engine stops on freeway I stuck on shoulder

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Originally Posted by Patrick of M View Post
R u reading those voltages at the key switch wiring harness or at the respective relays?

Measured at Relays, switch is unplugged, felt funky, new switch arrives tomorrow.

Accessories, run, start reproduced with jumpers where the switch plugs in to the back of fuse block 1.




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Originally Posted by vanski View Post
Those are some funky readings..

Remind us.. when you go to start do you feel a click in the starter relay?

No Click
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Old 01-26-2020, 04:58 PM   #38
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Default Re: Engine stops on freeway I stuck on shoulder

Not a sprinter, but I had an ignition switch melt down on an accord once. Just suddenly stopped working. A short in the harness had overloaded the switch, melting the solder out of the pins. So if you aren't getting power through the ignition switch, you should be able to bypass. Either with a jumper, or by plugging in a spare switch outside the ignition/lock assembly? Never tried it myself.
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Old 01-26-2020, 05:26 PM   #39
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Default Re: Engine stops on freeway I stuck on shoulder

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Not a sprinter, but I had an ignition switch melt down on an accord once. Just suddenly stopped working. A short in the harness had overloaded the switch, melting the solder out of the pins. So if you aren't getting power through the ignition switch, you should be able to bypass. Either with a jumper, or by plugging in a spare switch outside the ignition/lock assembly? Never tried it myself.

Did that, with jumpers.


see my temporary starter switch.
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Old 01-26-2020, 06:00 PM   #40
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Default Re: Engine stops on freeway I stuck on shoulder

Misread your original post, my appologies theres alot of back n forth going on.. no cranks without the start error on the cluster is typically the ground strap or the negative cable to firewall. Even though they look physically good they can be bad. Sometimes just grabbing that ground cable and moving it is enough to allow it to start. Being that you lost power on the freeway is something I havent experienced. In the parked no start situation I will typically have a good strong battery and a 2nd battery (jumper) I place one lead on the battery + and I attach the negative jumper lead to the strap bolt below the fuel filter.

I recently parked one and went back out a few days later to start it, no go. Long testing story short, the cluster showed “P” but the transmission cable must have not fully engaged the physical transmission shifter arm into park. Moving the shifter back and forth did the trick although this doesnt explain your dying on the freeway. Perhaps your chasing multiple
Issues

Last edited by jrod5150; 01-26-2020 at 06:43 PM.
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