Question about 2002 Jeep Liberty

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P0320 jeep code

What abut p0320

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Does car run (gee, kinda important that) or misfires/?
what do you want to know, the full FSM statement on said number.
you can buy the book or login to and read.
02 lib
which engine, can very by , ENGINE
roll dice, 3.7L
Trouble Code:p0320
No Crank Reference Signal to PCM
Number of Trips to Set Code: 1

Trouble Code Conditions:
Engine cranking, vacuum signals present; and the PCM detected from 3-8 CMP Sensor signals without detecting a CKP Sensor signal.
Possible Causes:
  • CKP Sensor signal circuit is open or grounded
  • CKP Sensor VREF circuit is open or grounded
  • Tone wheel or flex plate damage or erratic CKP Sensor signals
  • CKP Sensor is damaged or has failed
  • PCM has failed"
with a real FSM , it goes on to say how to do tests to prove which is the case. this is true for ALL DTC's
The cars computers is not AI, it just s dumb computer and techs,
do the tests to find out the truth.
the cable is loose to CKP is #1
CKP are a rear failure.

what i do see if the CKP is dead. or just misfiring.
if dead i check the CKP signals by HAND. (i use a scope in all cases)
if its dead, its dead.
if not i check the wiring for DAMAGE end to end.
if the CKP is good to PCM , the PCM is bad.
the error means really
on most cars.
the CKP sends pulses for TDC,
and if 1 in 10 are missing it sets this DTC.
if all are missing , that too , sets this DTC, and engine dont run.

that is why I asked you the runs question. and misifiing....

not the PCM sees the cam spin and pulse but the crank signal is wrong or dead.
The crank sensor tells TDC
the cam sensor shows, which cylinder it is on. for spark and injection timing.

together they work as team. so the PCM can create spark and fuel
at the correct time, (exactly)

Posted on Jun 03, 2014

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On Jeeps/Dodge/Chrystler Code P0320 indicates a problem with the Crankshaft Positioning Sensor.

This sensor tells the computer when the crankshaft is at Top-Dead-Center. If this sensor goes bad the computer does not know when to do anything. It all has to do with the timing of everything that makes the engine work.

The problem could be with the sensor itself.
Or the connector that plugs into the sensor.
Or the wires going to the connector.

Most likely it is the sensor itself.

On the Jeep Liberty the sensor is found underneath the passenger side just forward and above the oil pan. Make sure your engine is cool before you try to reach the sensor by hand because the exhaust so close. Look at the wires to make sure that they do not appear to be broken or shorted to the frame or something. Unplug the connector ans inspect it for corrosion or anything that might prevent good electrical contact. You can get a replacement Crankshaft Position Sensor from just about any auto parts store. It is a simple matter of unbolting the old sensor and bolting the new one back in. The BIG problem with this job is physically getting to the sensor and getting a socket to the bolt. Other than that it is a very simple procedure.

I have changed them without lifting the vehicle. If you do decide to lift your vehicle BE SURE TO USE JACK STANDS!!!

There are plenty of YouTube videos that show you how to do this.

Posted on Jun 03, 2014


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SOURCE: I have an engine code for a jeep grand cherokee

ignition/distributor engine speed input circuit malfunction

Posted on Oct 07, 2009

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2002 jeep grand cherokee diagnostic trouble code P 0320? how do i repair?

No Crank Reference Signal at PCM No reference signal (crank-shaft position sensor) detected during engine cranking. Use this youtube step-by-step to fix it. How to diagnose P0320 crankshaft position sensor circuit failure

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p0320 is-- ignition/dist, engine speed input curcuit malfunction. Check the two hoses on either side of the engine that go to the intake. Any kinks or cracks will give crank error. I beleive you have a bad crank sensor. not sending signal to pcm. crank sensor symtoms-- No RPM Signal to PCM . also check wires to crank sensor.

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I have code P0320 and P0340 on my jeep liberty what does this mean

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Apr 15, 2010 | 2003 Jeep Liberty

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Jeep grand cherokee ''1999'' engine revs up intermiten, engine code P0320, crank sensor or cam sensor? or something else?

Just trying to help. Jeep dealer won't tell you what code means? My guess would be in the intake system. MAF sensor? Air intake leak? I don't think its the pos. sensors because your engine would not run (been there done that). Your throttle is cable driven?

Mar 05, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Check Engine Light

Your diagnostic about this CODE is:

Generic P-Code DRB Scan Tool Display Brief Description of DTC
P0171 (M) 1/1 Fuel System Lean A lean air/fuel mixture has been indicated by an abnormally rich correction factor.
P0320 (M) No Crank Reference Signal at PCM No reference signal (crankshaft position sensor) detected during engine cranking. P0320 (M) No RPM Signal to PCM (Crankshaft Position Sensor Signal to JTEC) A CKP signal has not been detected at th
For more details, you can visit the obd_dtc_jeep

Good luck, and rated this help.

Aug 11, 2009 | 1997 Jeep Grand Cherokee

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