Minivan won’t Crank, won’t start
There are a whole host of electrical problems on Chrysler minivans that would cause either a no crank no start situation. But first you have to determine if the problem is related to the anti-theft system. An anti-theft related no crank, no start problem will appear as a start/stall, start/stall, (several or just once) and then a no crank. If those are the symptoms, first check your key ring to make sure you don’t have any other “transmitter” type keys on your key ring (regardless of brand). Then, try a different key. Finally, have the PCM scanned for theft system related trouble codes.
If your problem appears as a no crank under any condition, then you’ve got a horse of a different color. The PCM provides ground to a starter relay which then powers up the starter solenoid. Try providing separate ground to this relay and see if the starter will operate. If it does, then you have a problem in one of several areas. First, check for good ground at the PCM. Then check for a 5 volt reference signal (key on) at the throttle position sensor TPS (pink/yellow) wire. Also check for 8-9 volts at the camshaft position sensor CMP (brown/pink) wire. If either of those readings is off, check for battery voltage on the orange/red wire in the bottom wire harness connector at the PCM. Also check for battery voltage at the pink/gray wire at the top connector at the PCM. If you’re not seeing battery voltage at either of those wires, you may have a short in the wiring to either the TPS or CMP sensor.
Isolate each of those test wires and cut them a few inches away from the PCM. If you still don’t have power coming out of those wires from the PCM, you have a bad PCM. If you now have power, you’ve got a short in the wiring harness to those sensors. A short will cause the PCM to appear dead.
Shorts in the CMP and crankshaft position sensor are COMMON.
If all of those tests check out, check fuse #23 in the Integrated Power Module. That fuse powers several other components. The leak detection pump is a known problem that will short and kill the entire circuit.
Finally, if all those tests check out, you may have a short on the data bus line. To find that short, you will have to remove each control module on the circuit one at a time until you find the module that is causing the short.
© 2012 Rick MuscoplatPosted on by Rick Muscoplat