maddog1966 Posted May 12, 2014 Share Posted May 12, 2014 I have an 09 mru that won't turn over,the engine is not locked up and the starter was replaced and the relays seem to be working .I can't get the laptop to linkup please help Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/ Share on other sites More sharing options...
hatcity Posted May 12, 2014 Share Posted May 12, 2014 Have you tried jumping the starter?could be the key switch is shot Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245136 Share on other sites More sharing options...
maddog1966 Posted May 13, 2014 Author Share Posted May 13, 2014 ,the batteries tested good and another tech replaced the switch and could run a jump wire and get it to spin over . thank you Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245175 Share on other sites More sharing options...
wheeler73 Posted May 13, 2014 Share Posted May 13, 2014 Do the wipers and A/C work? If not I have had some that lost the chassis id in the vecu and would not crank or start with the key. Had to reprogram the vecu and fixed the problem. Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245206 Share on other sites More sharing options...
wheeler73 Posted May 13, 2014 Share Posted May 13, 2014 Also could have a J1939 communication link issue. Make sure to check all fuses and breakers. Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245207 Share on other sites More sharing options...
maddog1966 Posted May 13, 2014 Author Share Posted May 13, 2014 every thing on the dash works ,wipers, blower motor and I checked the fuses and breakers but I do have a dtc mid 144 sid 231 fmi 2 i got that off the dash .I can't get the laptop to link up .thanks for the help Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245225 Share on other sites More sharing options...
wheeler73 Posted May 14, 2014 Share Posted May 14, 2014 Check for power and ground to the data link connector. Also make sure none of the pins in the data link connector are pushed in which will not allow the laptop to communicate. I have seen that several times. Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245329 Share on other sites More sharing options...
maddog1966 Posted May 14, 2014 Author Share Posted May 14, 2014 thank you i will check for that . on the mp7 does the starter circuit go through a module? Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245351 Share on other sites More sharing options...
wheeler73 Posted May 15, 2014 Share Posted May 15, 2014 Yes it goes through relays and the vecu. I have had to bypass the wire from the ignition switch to the vecu with a new wire in some mru garbage trucks as the companys did not want to trace out and repair the original wiring. You can also unplug each ecu starting with the abs and see if you can communicate with the truck as a defective ecu can cause no communication. Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245480 Share on other sites More sharing options...
jnr_ate Posted May 18, 2014 Share Posted May 18, 2014 (edited) was it playing up before the starter was replaced or your looking for that fault. Edited May 18, 2014 by jnr_ate Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-245914 Share on other sites More sharing options...
wheeler73 Posted May 20, 2014 Share Posted May 20, 2014 Also could have a defective EECU. Have seen that also. If you have another EECU you can try it. Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-246231 Share on other sites More sharing options...
staxx Posted May 20, 2014 Share Posted May 20, 2014 Dont forget your radio is a computer also , has 1939 com wires to it , try pulling it out and unpluging. Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-246234 Share on other sites More sharing options...
wheeler73 Posted May 20, 2014 Share Posted May 20, 2014 I forgot about that one staxx. I have also seen the radio 1939 comm wire rub through on the mru and leu in the roof area. To me it was stupid to run 1939 to the radio but what do I know I am not an engineer. I just rembered also unplug the turbo actuator is has 1939 com 2 wires to it but have seen strange issues with it also. Quote Link to comment https://www.bigmacktrucks.com/topic/35686-mru/#findComment-246243 Share on other sites More sharing options...
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