Question about Volkswagen Passat

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I have a 1995 volkswagen passat car with a vr6 engine. i installed a used engine into car and now i cannot get car to start. the car will turn over but will not fire up. i have checked the fuses and all are good. i installed a new fuel pump and i checked it before i installed it and it works great when i hooked it up directly to a 12 volt battery. but when i hook the car hook ups to it the pump would not function. i checked the fuel pump relay and it open and closed like it was suppose to. so the fuel pump will not operate when hooked up to car, but the car will not start even when i hooked up pump directly to 12 volt battery and tried starting the car that way. the pump operated and flowed fuel to injectors but car would not fire up. i also purchased a new ignition switch for car. i have noticed that the odometer and digital clock will display on and will stay on even when i turn the car switch off and take out the key, is this normal? and i know normally on cars when you turn key to the on position or try to start car the dash instrument cluster is suppose to light up with the oil, temp, altinater, check engine light is suppose to light up. but mine does not. it has no instrument lights that will light up at all, nothing but the odometer, and clock. i have no idea what is wrong with car and why it is no power getting to parts or engine. is there a relay i should check, or something else i need to look at?

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  • pradadlw Sep 10, 2010

    i have checked all my connections on the electrical system and everything is correct. i got to thinking about why there is no power and why dask cluster will not show power to check engine, battery, altinator, oil and so on. i pulled the ECM power relay out and i checked it by hooking the #86 and #85 relay terminals up to a 12 volt battery to see if it would open and close it did not click or anything. then i hooked up my multimeter to the relay terminals #87 and #30 to see if meter would display a rading and it did not move any. just to be sure i was doing correctly i done the same with my fuel pump relay and it clicked and meter functioned correctly. so i believe that the ECM power relay is bad. do you believe this can be the problem? i ordered a new relay an i am waiting for it to arrive. i would have changed out one of my other relays in the car but the volkswagen relays all have different terminal locations on them so you cannot interchange them. let me know what you think about the ECM.

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Hi,

It seems like the wire harness to the engine management system is unplugged check your connections, and just in case, I am sending some diagrams, pick the ones for your vehicle and follow the wriing to find your loose connection.


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Posted on Sep 08, 2010

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1995 Volkswagen Passat Sedan
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