A caravan 3.3L one day will not Crank, the Battery is Good, All fuses Good,neutral Safety Switch is good, Starter Is good, Scanner will NOT Communicate with PCM Cannot run ATM tests with scan tool, BCM Communicates with scan tool ok. Fuel Pump runs, Security light on,All lights work key on. Wont' make a difference with battey charger connected. Disconnected Battery, No Change. PCM Will NOT do automatic VIN entry with the key ON. Engine Will turn over if I "jump" the Starter Relay but just Cranks.
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Brown wire with yellow tracer shows to be wire color. You can always jump the starter to get it to crank, but, that doesn't mean it will start. In the past I have been lucky, different vehicle, I put the key in on position, jumped the starter relay, the vehicle started, I managed to get it home.
When testing, make sure tranny is in park or neutral and functional parking brake is set. There are safety issues, safety is your responsibility. You don't want the vehicle to move when your working on it.
You realize if you bypass anything, it may start in any gear, if it does it will run over you or one of the kids, anything that gets in the way. Again, safety for everybody is your responsibility.
Do you mean it won't crank at all, or cranks but does not start. If the first, turn on headlamps and try to start. Do headlights dim? If not, you may have bad battery connections, bad solenoid, bad neutral safety switch. If lights dim, bad battery, connections, solenoid or starter motor.
Sounds like an electrical problem. The caravan has multiple safety cutouts that prevent the engine from starting. The ignition switch and the neutral selector switch are the two most likely to cause the starter not to turn. The function of these as well as the starter solenoid relay and the battery connections and such can be checked with a voltmeter. Grab a manual at your favorite local auto parts store and begin troubleshooting before you go and buy more parts you may not need.
Maybe something wrong with neutral switch? Usually it is on or close to transaxle shift lever, follow the shift cable to shift lever, the switch has multiple wire connector.
It may be possible to start vehicle by jumping the load side of starter relay, key on. There are safety issues trying this, the vehicle will crank in any gear. Make sure tranny is out of gear, parking brake is set, block the wheels, whatever it takes to be safe, safety is your responsibility.
If the problem isn't that neutral switch, then I don't know? Any applicable trouble codes?
Maybe the starter or starter solenoid is bad. First, make sure connections at battery and starter are clean and tight. Old school method: turn headlights on, and (if good and bright) observe them while someone turns key to crank. If they dim noticeably and starter makes no sound, likely the starter has failed. If you observe no difference in headlight strength, then likely the starting circuit from ignition switch to starter solenoid is not working. You could take the wire off starter solenoid and see if it has power there while key is in crank position. If you do have power there, starter needs to be tested, or the solenoid is bad. If no power to the solenoid when cranking, then the circuit from the ignition switch to the solenoid will need diagnosing. Your neutral safety switch, and possibly a starter relay is in that circuit before it reaches the solenoid. Good luck.
It's most likely the neutral safety switch. Try putting the shifter in Neutral and slipping it just a little toward Park and see if it'll crank. If it does the neutral safety switch is the problem but worn linkage is the cause.
You've already check or replace everything else so it has to be this or the ignition switch.
there is an interrupt switch, called neutral safety switch. When it fails or goes out of adjustment, no start, and essentially no protest or indication. Try foot on brake, shift to neutral, turn key to start and slowly move shifter out of nuetral in each direction. If starter actuates, look into switch adjustment.