Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: doubleducks on June 10, 2015, 06:34:26 PM

Title: Immobilised Engine
Post by: doubleducks on June 10, 2015, 06:34:26 PM

Hi,

Pretty much desperate for help!

My Dad's 2001 Jeep Grand Cherokee's engine has immobilized itself. We have hooked it to 3 different diagnostic machines, and each one has come up with no result.

We get to first stage ignition but there is no engine turnover and the dials do not move at all. It seems that all of the other electric work, e.g. door open notifications etc.

Please help!

Title: Re: Immobilised Engine
Post by: ivanidea on June 10, 2015, 10:44:59 PM

Ignition switch out of sync?

My TJ has an intermittent problem with not starting, and sometimes, when it does start, I don't get radio/wipers/indicators.

Title: Re: Immobilised Engine
Post by: LairdScooby on June 23, 2015, 12:25:36 AM

Is it automatic? Try shifting from P to N and back again rapidly while holding the key in the start position if so. If the starter comes back to life then the inhibitor switch (Neutral Safety Switch) needs either adjusting or replacing.

Not sure if this bit will apply to the later models but there is a fuse in the PDC (underbonnet fusebox) that protects the starter relay on my '94 XJ Cherokee - if yours has this and it has blown it will prevent the starter from working.

Title: Re: Immobilised Engine
Post by: bigjeepzj on June 23, 2015, 07:34:40 AM

 :iagree: the neutral safety switch is the first place to look. What engine do you have in it

Title: Re: Immobilised Engine
Post by: Bubba on June 28, 2015, 10:53:56 AM

 :iagree: best first place to check

Title: Re: Immobilised Engine
Post by: Mike Pavelin on June 28, 2015, 04:02:25 PM

Pull the starter relay and jump the two larger terminals and see if it cranks (Make sure it's ion Neutral first)

Title: Re: Immobilised Engine
Post by: bgbazz on June 28, 2015, 04:38:49 PM

Do we know if it's an auto or manual box yet?


Auto = possible NSS

Manual = possible clutch safety start switch. (pretty much the same thing, but in a different location).


Just my two bobs worth.

Title: Re: Immobilised Engine
Post by: Mike Pavelin on June 28, 2015, 08:30:10 PM

They're all auto.

Title: Re: Immobilised Engine
Post by: bgbazz on June 29, 2015, 06:20:40 AM

How strange!  I never knew that.  :017: