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I have a 1999 Jeep Cherokee. Will crank but not start. No…

Customer Question
I have a 1999...

I have a 1999 Jeep Cherokee. Will crank but not start. No fault codes. I replaced the crankshaft sensor. A mobile mechanic friend who has looked at it says he cannot find the 12 volt signal. Can you give me some suggestions as how to go about troubleshooting on my own. I have a voltmeter for test equipment.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

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Submitted: 2 years ago.Category: Jeep
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Answered in 22 minutes by:
2/28/2016
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago
Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 27,817
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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Hello and welcome! My name is ***** ***** I can assist you with your question. First thing to do is check to see if the engine has spark. If so, check to see if the engine runs on starting fluid. If it runs on starting fluid, then you just have a lack of fuel. If it does not have spark, you need to check the ignition system and computer system to ensure it is in good working order.

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Customer reply replied 2 years ago
It has fuel. How do I need to proceed to check the ignition system and computer system?
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

I would start by checking to ensure that the computer is awake with the key on. Check to see if the check engine light comes on with the key on and that the TPS has 5 volts with the key on.

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Customer reply replied 2 years ago
What is the TPS? and if this checks out, what do I need to do next? The mobile mechanic who has worked on it says he can not find the 12 volts.
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

If this checks out, the cam and crank signals need to be checked using a lab scope

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Customer reply replied 2 years ago
I have installed a new crank sensor. Do you mean an oscilloscope and if I had access to one, how would I go about checking those signals and what would I be looking for?
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

YES, that is correct. You would be looking for a signal from both the cam and crank sensors while the engine is turning over

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Customer reply replied 2 years ago
Where would I test those signals and what should I expect to see?
Customer reply replied 2 years ago
Is there a technical reference on the internet that I can access?
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

You can test these right at the sensors or directly at the PCM. You are going to want to see an on off signal as the engine is cranking over.

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Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

Did you have any further questions?

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