P0320 failure - JeepForum.com
 
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post #1 of 10 Old 07-25-2020, 09:05 AM Thread Starter
Wincher360
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2002 WJ 
 
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Posts: 7
P0320 failure

Hello , i am from germany and have registered because i need help for my WJ
(excuse my poor englisch)

2002. 4.7HO Overland,


14 days ago i had a p0320 failure and engine stops on the road.we have towed it away to the garage from my brother
a short start was then possible again.

Have changed the CPS with original Mopar Part
wires and connector seems ok.
engine starts and runs 7 km home.
30 min later the same, i could not start
Have failure P0141 and P0161 to. one lamdasonde was broken, maybe from the CPS repair with the starter...
Today i drive the 7 km to the garage with no problem.
Changed the 2 lamdasonde behinde the Kat
all failures gone.
out of the garage, idling a few minutes, the engine dies again with the P0320
I cant see any damage on the black C1 connector or the wire harness.
I have the wire diagramm because have bought a manual CD for the Car.


What is the next step to check if the control unit is bad or it is only something else?
the circuit goes to S119



thanks in advance
V/R Wincher360

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post #2 of 10 Old 07-25-2020, 09:24 AM
HampshireWJ
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The P0141 and P0161 codes both relate to Oxygen sensors (lambdasonde) both downstream of the Cat on for each bank, banks 1 and 2 respectively. Maybe they both need to be replaced to cure your problem.

It maybe that the wires in the loom they go into are broken and is sending the P0320 code. Hopefully JTec will be along and he can point you in the right direction.
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post #3 of 10 Old 07-25-2020, 09:30 AM
jtec
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Splice - S119 goes to the TCM.
see attachment.
Attached Files
File Type: pdf 02 WJ P0320.pdf (72.8 KB, 11 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 10 Old 07-25-2020, 10:07 AM Thread Starter
Wincher360
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Quote:
Originally Posted by jtec View Post
Splice - S119 goes to the TCM.
see attachment.
cant see the attachment unfortunatelly
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post #5 of 10 Old 07-25-2020, 10:12 AM Thread Starter
Wincher360
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Quote:
Originally Posted by Wincher360 View Post
cant see the attachment unfortunatelly

All ok. i have it!
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post #6 of 10 Old 07-25-2020, 04:20 PM
99wjtx
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I don't know this for sure but I suspect a failing PCM can cause occasional, random low RPM stalling and a P0320 code. That's what I was having a couple of years ago even after changing out the crank position sensor with a genuine Mopar part. Once I replaced the PCM, the problem went away.

Rage! Rage against the dying of the Jeep.

99 WJ Limited 4.7/NV247
01 WJ Laredo 4.7/NP242
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post #7 of 10 Old 07-26-2020, 01:21 AM Thread Starter
Wincher360
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I have read the manual just now.
Thanks for it!

First I have no DRB3 test device

All the wire mesurments are clear, but are they meaningful?
The jeep starts and drives sometimes.
In this status the wires, volts and ohms have to be ok or not?
a few miles without problem, then dies idling after coldstart in 3 minutes

The measurements are: ignition on, engine not running - with no influence from temp and vibration
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post #8 of 10 Old 07-31-2020, 12:02 PM Thread Starter
Wincher360
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today i have found time to do some work on the jeep.
first i tried to start. yes it does.
dissasamble the battery and the battery holder and started again.

wiggled the wires at the CMP Sensor and controlled my OBD 2 tester.

No trouble codes, no influence or disorder

assembled branch connectors at K7/K24/K4 2 inches behind the PCM connector

ignition on; 5.17V at the 5V Supply to ground,

ignition off and PCM connector disconnected:
ground sensor to CKP signal: 25kohms
5V supply to sensor ground: 4,84kohms
it is a new mopar CKP sensor installed, i dont believe the failure is in this part.
The starter is not disassambled and the CKP connector is connected.



Do you have any idea?
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post #9 of 10 Old 08-02-2020, 07:46 AM Thread Starter
Wincher360
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Did all the measurments in the P0320 Manual from Test 3 on:
Test 1+2 is with the DRB3 scope
Have
5,25 V (4,8-5,2V recommended)
0,2 Ohms for below 5.0 ohms
4.19 kOhms CKP sensor signal (higher than 100 ohms-ok)
9.11 kOhms 5 Volt supply (higher than 100 ohms-ok)
I cant find a wire failure until test 12. and 12 says replace the PCM


should i try a new Cam Position sender before replacing the PCM??


How to get a repaired and programmes PCM?
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post #10 of 10 Old 08-04-2020, 02:19 PM Thread Starter
Wincher360
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ok i will finish the thread , it is no interest and feedback here.
today let the engine run warm and did a few meters on the court.
No problem. let it run at idle again a few minutes and he dies .
P0320 and new P1391
P1391: Loss of the CLP or Crank position sensor has occured. For PL 2.0L
Dont know was "PL 2.0 "means
Will order a Cam pos senor and replace them.
Bye!
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