View Full Version : CPS

February 19th, 2012, 06:26
Is there a crank position sensor on a 97 4.0L, and if so what does it control.
If it were failing what would be some symptoms.


February 19th, 2012, 06:38
Yes you should have one on the bell housing of the transmission.

When mine (98 Sport) was acting up it would get warm and then shut off but restart after a while.

When mine went out, it would crank and crank but never start up.

Buy mopar original not off brands.



February 19th, 2012, 08:11
The PCM uses CPS input to time the ignition and fuel injectors.

Sometimes as ckowenos mentioned, it can suffer thermal failure and the PCM will shut down the engine.

This usually won't trigger a trouble code, because for some reason the PCM thinks the engine was shut down normally.

Unfortunately, there are a lot of other things that can cause this as well.

If the CPS fails completely, you may see the words "NO BUS" appear in your odometer window.

Good luck... you may be in for a lot of head-scratching.... ;)