Thursday, December 27, 2012

Jeep Grand Cherokee will crank but not start

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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