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Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 24101
Experience:  ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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2002 Jeep Liberty: 2wd, with a 3.7 V-6..intermittent

Resolved Question:

I have a 2002 Jeep Liberty, 2wd, with a 3.7 V-6. I have an intermittent problem. Sometimes, when I have been running around town, I will get in to start the engine. The lights, radio, and all other electrical work fine. But the engine will not crank. My first thought was that the neutral safety switch was bad. After researching, I discovered that the Jeep Liberty does not have a Neutral safety switch. It has, instead, a transmission range sensor and solenoid pak. My computer is not showing any codes, the battery is new and stronger than required, I replaced the starter, the ignition switch, and the ignition key switch just in case a worn switch could cause this. I am still having the problem. So far, everytime this has happened, if I wait 10 to 15 minutes, it will start up like a brand new car, just as it does any other time that I do not have the issue. I also have a short in the headlight switch. What else can be the problem? Can a short in the headlight switch have anything to do with it? I am waiting on the headlight switch, which is on back order. The only other things in the ignition system schemata are the PCM and the keyless entry brain. Please help. My e-mail [email protected]
Submitted: 4 years ago.
Category: Jeep
Expert:  Amedee replied 4 years ago.

YES.. that is correct! The Transmission range solenoid is located inside the transmission/solenoid pack. I am confident that your problem is going to be one of two things. Either this transmission range switch or a bad PCM. However, testing will need to be done before anything is replaced. You are going to have to diagnose this by process of elimination. Check to be sure that the transmission range switch is sending the correct signal back to the computer when this happens. You are also going to want to check the ignition switch signal back to the computer as well. If all checks out ok, then the PCM is bad and needs to be replaced. However, if the transmission range sensor is not reading correctly, than it will need to be replaced as well.
Customer: replied 4 years ago.
If the range sensor is reading improperly, wouldn't there be an OBDII code? And if the PCM is bad, wouldn't there be other random codes? This is why I did not suspect these items.
Expert:  Amedee replied 4 years ago.
The range sensor will only set a code is it is out of limit or if there is an open circuit on one of the signals circuits back to the PCM. It wont set a code if it says it is in drive when it is really in park or neutral.

The PCM does not normally set a code when it goes bad.
Customer: replied 4 years ago.
That makes sense. I wish I could find a tech manual, like what the manufacture/dealer technician would have. I probably could have diagnosed this myself. Thank you for your help.
Expert:  Amedee replied 4 years ago.
You bet!

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