2012 nissan pathfinder/no start no crank

Question

hello all and thank you for reading. I am working on a friends 2012 Nissan pathfinder that his mechanic gave up on after throwing some parts at it and not fixing it. scanned it and its throwing a u1000 code. It will not crank or start. I'm measuring the ohms on the can bus and its only 6 to 7 ohms, not the 60 or so it should be. I've disconnected the ecu, bcm, transmission control Module, instrument cluster, smart fuse block, Nissan vats system and a few other bits with no luck or change in ohms. I'm starting to think this thing may beat me. It were a short in the harness, I should have OL? What am I missing something? thank you all!

Answer 1

Sometimes we overlook things and jump to conclusions. This may be one of them, presuming the U1000 error code isn't preventing starter operation. Some vehicle antitheft systems will disable the starting circuit and maybe injector operation or ignition system as a way to prevent theft. In factory antitheft systems, there should be an indicator or digital display warning of a theft attempt. Does this '12 Pathfinder have an indicator informing you with a beep and/or indicator of; factory theft deterrent is ON, OFF, on standby (blinking) or flashing quickly (theft attempt with electronics disabled to prevent starting and driving away? This presumes all wiring and connections are intact before the error code occurred. If factory or aftermarket antitheft system aren't triggered to prevent starting, then this may be a starting problem related to; battery, battery cables their connections and main grounds between battery and engine block. Separating factory or aftermarket antitheft systems must be understood before proceeding with starting issues; starting circuit, fuel or spark problem. I tend to ignore an error code like this unless certain that it's pointing to a major wiring issue related to the two wire canbus connected to all modules and the error code is pointing to the factory antitheft system disabling starting. I try to use the simplest diagnosing routine using all information at hand before presuming an error code is pointing to a real fault. In this case, unless you know how this antitheft system operates to eliminate it in order to move on to a possible starting problem, you may be juggling too many what-ifs and getting lost.