hey people

not sure how much help i can get but my 07 that has an aftermarket push button start is not cranking or starting.
with test light not getting 12v on solenoid on the starter .I have the 12v.on the battery cable on starter, will crank if i jump 12v to solenoid.
pretty sure its gonna wind up being push button start computer box. it was already installed when i bought truck, im thinking its a little beyond me to uninstall, only place reasonably close to me that will work on it is still 20 miles away so tow bill will be $$
started great one day. the next no crank. i know there are plenty of threads with no crank situations so just hoping i can check some other things before condemning push button issue. checked fuses etc. like a modern car you push button each time to simulate on and accessory
positions and they all work, radio etc, i know there is a key under the dash for the security bypass, what symptoms are there when there is a security issue?

thanks

 

you need to find out what start system is installed and find the installer instructions for it. then trouble shoot it. could be a bad connection or relay / button or the module

 

yeah its a no name piece of junk ebay special for sure, i know yor one of the most knowlegable guys here, if you could at leat direct me to some troubleshooting as if it didnt have the pushbutton start, it may be helpful, again maybe a security issue or even bcm issue

thanks

 

Can you jump the solenoid to get it to start and drive it to the repair place, or is there no ignition power at all?

Can you find the kit on ebay and see if you could get the installation directions and go in reverse steps to uninstal

 

I would start with the things that keep the truck from cranking even with the key, like the neutral/park safety switch
is it like the new vehicles that have push button start, you have to have your foot on the brake pedal to start it, check the brake light switch,
most likely if it was a security issue the light would be lit up on the cluster

Neal

 

Yeah definitely need to investigate neutral safety switch. I tried starting it in neutral. Is switch under console plate
or underneath column?

 

There are a good number of threads on the switch, I haven't had to repair one so not sure where they are but remember from a thread it is located in the center console on the shifter.

Neal

 

does the cluster say what position the gear shifter is in like P for park R for reverse N for neutral and D for drive as you shift through the gear range? the neutral switch is on the transmission. if the cluster does not show your shifts properly maybe the shift cable bushing on the transmission has broke.
if the remote start is chinesium and has no info. look for its module. then follow its wiring and strip it out. then reconnect the factory harness wires by there color codes to whatever was spliced.

 

i know shifter cable is good . i know not a single car stereo place near me will even look at it, and my mechanic
( i do almost all repairs myself) wont either actually forgot to look at display for park but tried starting in all gears.
the ignition switch gets disabled when the pushbutton start is installed so cant try to even try to start manually.
its my third vehicle so not in a rush, but really want to get it started even if its just to drop offf for repair,
ill climb under to look for nuetral saftey

 

Pure theory on this, but a few easy checks may help (note the PCM plays a big part in the ignition cycle) :-

1. Check the 10A "CRANK FUSE" (fuse box near battery) For ignition "Start" 12V feeds via this fuse to the "CRANK REQUEST" input of the PCM, this is the purple wire going to PCM C2-5 (note the China module may have a relay to mimic this ignition "Start" operation)
   
   Connect a multimeter between battery ground and "CRANK FUSE" press Start and 12V should appear here, if not it suggests a China Module issue
   
   When the PCM sees 12V on it's "CRANK REQUEST" it should drive it's "START ENABLE RLY CTRL" output.
   
2. Check the 10A "IGN E" fuse, the Dark Green wire of the CRANK RELAY feeds via the PARK/NETRAL switch, vis this fuse and on to the Ignition Switch (normally)
   
   Press Start and check 12V appears on this wire (again the China module may have a relay to mimic Start & On operations)
   
   The other side of the CRANK RELAY coil connects via the Yellow + Black wire to connector C1 Pin 39 of the PCM (relay drive output)
   
3. To check the Park Neutral Switch, in Park measure the connectivity between "IGN E" fuse and CRANK RELAY (dark green wire) this should read less than a few ohms

To recap, if 12V appears on both the Crank Relay Dark Green wire and the Crank Fuse the issue lies with either the PCM itself or its being inhibited by some other vehicle condition (possibly)

Attached is the relevant wiring diagram (note this is for an 04 by probably the same) I've sketched a simplistic "possible" representation of how the China Module wiring might look - pure guesswork on my behalf.

As far as I can tell, a crank should always be possible and the PassLock security etc will prevent ignition i.e. firing.

Hope this helps