Solved: cat not starting

Check Engine light ON, Vehicle will crank but not start

2003 Jeep Computer Scan Showed following codes: P0122, P0320 and P1763

As per the error codes mentioned i will provide the details about the codes :----

Starting with OBD error code P0122 .

These code is for the throttle position sensor and won't be related to no start condition which you are facing.
OBD code P0122 sets when the voltage signal from the sensor goes to or near 0 Volts.
This code can be caused by the faulty throttle position sensor itself or it's signal wire being shorted to ground.
As per our Auto garage repair experience, i will say that most often it's just the sensor itself and replacing it would take care of the code.

For your 2003 Year model jeep grand Cherokee the throttle position sensor is mounted on the back of the throttle body and held on with two Torx screws.Its not very difficult to locate and replace.

Moving to the other error code that is P0320 ...............

The OBD error code P0320 can be related to no start problem.
I will explain with more explanation,to make you understand the occurring of these error code.

Its related to Crankshaft sensor. P0320 sets when the engine controller isn't seeing an input from the crankshaft position sensor but it knows the engine is turning.

As per our garage repair experience i will say .........

The crank sensor goes down into the transmission bellhousing at about the 11:00 position.
It can be viewed from behind and it reads off a tone wheel on the flexplate.
The purpose of crank shaft sensor is to read the position and speed of the crankshaft.
Another main reason of crank sensor is that it calculates the spark, without it's signal the engine can't start. When you start the engine engine cranks and spark plugs provides required spark, and these spark is sensed by crank sensor and it gives signal to engine thast spark is received.
But if crank shaft sensor is faulty then it will not sense the spark,even though the spark plugs are working right.

Again this could be the sensor or it's wiring, but it's almost surely the sensor. Crank sensor failures are not uncommon.I will say at our garage we have deal with many vehicle no start issues,due to faulty crank shaft sensor.

Now moving to the another code that is P1763 .............

OBD code P1763 is related to vehicles gear shift issues.

As you have received P1763 code,so first confirm do you actually notice any kind of gear shift issues.

As per our car repair experience i will say the crank sensor won't be related to these other issues. With the TPS or the P1763 you wouldn't really notice a miss. You might notice a hesitation at the exact time the P0122 sets, possibly not.

Related to error code P1763 i will say

The P1763 is indication to monitor the governor pressure transducer in the trans.

On your jeep vehicle the trans has an electronic governor using a solenoid and a transducer to control governor pressure for upshift and downshift timing.
For transducer, it is the plastic pressure sensor mounted off to the right side of the valve body, it's just to the right of the filter when the pan is removed.

This code could be caused by the transducer or it's wiring, but the transducer is a common repair and will almost surely be your issue.

So without your vehicle running,you cannot confirm the actual gear shift issues.

What i suggest, is replace the crank sensor and get it running again.
Then clear the codes and wait to see if the engine light comes back on.
If the Engine light is again ON,then re-scan the vehicle to see if same error codes are coming up or not.
If yes then governor transducer or the TPS are to be inspected and replaced.
but mostly as per our regular vehicle repair deals i think these codes will get cleared once the vehicle starts running.

Hope these details will help you.
Thanks.

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When the Check Engine Light comes on, a diagnostic trouble code (DTC) is recorded in the on-board computer memory that corresponds to the fault.
If you see a "check engine" or a "service engine soon" light in your instrument cluster, your car has stored a diagnostic trouble code.Your vehicle has many different sensors that monitor and control the various systems that keep performance, mileage and emissions at an optimum level.This means the computer system on your vehicle has detected a problem within various systems it controls and monitors.
It might be something serious - or it might not.But if other warning lights are on, you ought to cease and inquire in to the issue.The Check Engine Light (which is actually the Malfunction Indicator Lamp or MIL) alerts you when an issue occurs in the engine control technique.Other types of issues will turn the Check Engine Light on, and it will stay on until the fault is diagnosed and repaired.Check Engine Light to come on is probably minor and won't delay your ability to continue driving.There is no way to know until you diagnose the vehicle.

Depending on the nature of the issue, the Check Engine Light may come on, stay on continuously or flash.When the issue goes away, the Check Engine Light goes off.Some intermittent issues will make the Check Engine Light come on only while the fault is occurring.The Check Engine Light also tells you nothing about the issue.A Check Engine Light On issue can be annoying because it seems to have a mind of its own.If no other warning lights are on, and the engine appears to be walking normally (no unusual noises, smells, vibrations, etc.So you don't know in the event you ought to cease immediately or ignore the Check Engine Light and keep on driving.
Common reasons for the CHECK ENGINE light to come on include a loose gas cap, fouled spark plugs, dirty fuel injectors, the failure of an engine sensor such as the oxygen sensor, throttle position sensor or manifold absolute pressure sensor, or an issue in an emissions control technique or tool such as the EGR valve or catalytic converter.

To find out what your vehicles computer sees wrong, you will need a simple to use tool called an OBDII trouble coder reader.
Connect your code reader to the under dash connector.In some vehicles you might need to look around a tiny, on the passenger's side, & around the middle console under a plastic cover.
Locate your vehicle's computer connector ( computer is also called as ECM/ECU), most are on the lower driver's side.The code reader will automatically turn on & prompt you to the next step for code retrieval.
If the trouble code light has been illuminated your vehicle enters into "limp mode" this means it is running on a predetermined program that causes poor mileage and increased emissions.
One time the code has been identified look up the definition on the trouble code chart supplied together with your code reader.
After repairs have been made, clear trouble codes & recheck process.

If you dont have OBD II scan tool.Then you will have to get your car/truck scanned at local car garages,who has this tool.Or at autozone service center,its free to get your car scanned.They do it for free.They charge for parts,if you get it replaced from them,but reading code is free at autozone service centers.
This details and procedure will help you.

For more car related problem troubleshooting:---

This are the sections, you can go through and click the link to read its troubleshooting.

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