Question about Mercedes-Benz Sprinter

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I need a wiring diagram for a Merc Sprinter 311 LWB, 2004.. Now doesn't start after a so called Merc Mechanic took the engine out and rebuilt it... Sounds like a fuel injector problem, maybe with the wiring as it wasn't labelled, which is what I would have done... any ideas?? It has compression, but sounds like fuels not getting through and I don't want to knacker the ECU if it hasn't already!!

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  • Mercedes-Benz Master
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I am going to give you some generic advice that works on all makes and models. First check the fuses, Pull them as they can loose contact, thus loose power. Check all the igntion, ECM/PCM and BCM, Fuel pump and relay, and injectors fuses. Best to check them all, but atleast these. Also check to see if there is a security issue, your manual should tell you how to reset it. Check the fuel pressure, just because you have fuel, doesn't mean you have enough pressure. Wiring harnesses are what I call idiot proof, You can not plug the wrong wire into the wrong part. Engineers got something right. Now if all that checks out then you need to work your way to the injector harness. Disconnect a few that are easy to access. First turn the key on and check for power, one wire will have 12 volts, the other wire goes to the ecm. A test light or volt meter will work. If you have power then you need to test the ecm, you can use a volt meter or there is a NOID test light you can get that is inexpensive at the parts store. using the meter put the leads to the harness leads and have someone crank the engine over, the meter should jump in voltage, it wont read 12 volts as it is on for milliseconds. if you use the noid light it will blink. Check several injector plugs.
When you get this far, Let me know as I have lots more. I don't want overload you to much.
Randy

Posted on May 22, 2011

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