WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Troubleshooting/Problems

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 05-20-2015, 11:40 AM
Member
 
Join Date: May 2015
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 654
jbanks25 is on a distinguished road
WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

I bought a bit of a project limited GC a few days ago, and I'm just getting into what may be wrong with it. I know a little about the history of this guy in that it has a frequent stalling problem. Frequently the truck will die, and the gauges will die as well (Overhead display test will fail). The only fix is pulling the negative cable and then putting it back on. Then the truck fires right back up. I know the previous owners replaced the PCM, but I have no idea where it was sourced. It was programmed by a dealership though, but after I read the stickied post on this forum, I'm wondering if this could be the crank sensor failure problem.

As far as P0731 the transmission appears to be running on only 2 gears. No overdrive for sure, but I only feel it shift once. If I put the shifter in 1st it will run and never shift. Moving it to 2nd appears to do nothing, and moving it to drive then makes it shift up. OD on off has no effect.

Additionally sometimes the srs light will come on and then go off, which I attribute to a clockspring going bad.

Any thoughts on these issues would be helpful.

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 05-20-2015, 06:39 PM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,413
Thanks: 18
Thanked 382 Times in 369 Posts
Rep Power: 529604
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

Welcome to the garage.
Does your jeep already have the hydraulic cooling fan?
Did you check fuse 16 (15A) in the PDC? It is feeding the hydraulic cooling fan module and the O2 sensor heaters.
That you loose the instruments and the EVIC point towards a problem with the PCI data bus, on which most of the electronic modules communicate on.This can be caused by a shorted bus to ground(close to/or 0V), shorted to a power source (can be any voltage above 2 V) or an electronic control module which is faulty and cuasing the bus voltage to rise to around 7.5V. Normal bus voltage should be around the 2 V.
Is there any connection regarding the stalling and the weather (rain)? A faulty crank sensor for sure can make the engine stall. A faulty crank sensor can bring down the 5V sensor feed, which also feeds cam sensor, TPS and MAP sensors. Seems that the PCM in that case can short out the PCI data bus.
The P0731 means an incorrect gear ratio in 1st gear. This normally means that it is slipping in 1st gear (so ratio between input and output is not within expected range). Most probably the TCM will put the transmission in 3rd gear (limp mode) when in D, or 2nd gear with shift lever in 1st or 2nd. This should normally reset after ignition off/on, but with the fault active, it will return into limp mode as soon as you start driving again.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 05-20-2015, 06:52 PM
Member
 
Join Date: May 2015
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 654
jbanks25 is on a distinguished road
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

thanks for the reply, I really appreciate it. FUSE 16 (O2 10amp) looks good. I was really hoping you were going to say internal crank short, but I was afraid it would be a sorted write house chase... Any common places to look? I just took possession of the jeep, so I have no idea if train is a factor yet. I grabbed a lot of the bundled words and shook/tapped then quote a bit and couldn't get it to stall today. 40 miles without incident.

as for the transmission, that's bad news. I was hoping for a sensor. I for sure have 2 forward gears at all times though. Is that still how limp mode would operate?
Reply With Quote
  #4  
Old 05-20-2015, 06:55 PM
Member
 
Join Date: May 2015
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 654
jbanks25 is on a distinguished road
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

Fan is belt driven with a hydraulic clutch.
Reply With Quote
  #5  
Old 05-20-2015, 07:18 PM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,413
Thanks: 18
Thanked 382 Times in 369 Posts
Rep Power: 529604
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

According the jeep service manual fuse 16 should be a 15A, but maybe it has a lower value on your jeep because it doesnīt have the hydraulic cooling fan.
The short can well be inside the crank sensor, they used to start giving problems when getting hot. Probably a good point to start with this sensor, it sits right above the starter and the starter must be removed to get access to it. Mopar sensors seem to perform better then aftermarket stuff.
Does the transmission always shifts twice when in D? Its normal when in limp mode that D = 3 rd gear and 1st/2nd is 2nd gear. But in D it should not shift when in limp mode. If it still shifts, its not in limp mode.
Did you reset the fault codes and see if they came back?
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #6  
Old 05-20-2015, 07:32 PM
Member
 
Join Date: May 2015
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 654
jbanks25 is on a distinguished road
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

Crap, cursed myself. I just went out to start it and it wouldn't. My code reader could still connect to the ECU though. Only reading the transmission code at that point though. Battery is now disconnected so I can start it later.

When I am in Drive I always have 2 forward gears. So not sure where that leaves my Trans, but I guess not in limp.
Reply With Quote
  #7  
Old 05-20-2015, 07:58 PM
Member
 
Join Date: May 2015
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 654
jbanks25 is on a distinguished road
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

Yeah, it must be really grumpy now because it won't start. I htink hooking my scanner up may have ticked it off. It's funny, with key in the on position dash lights up, but no gages respond. If I try the code reader then, it can connect (I can actually hear it generating interference over the radio as it connect which seems strange) and it can pull engine rpm at 0 and TPS at 1.9 in the live data.
Reply With Quote
  #8  
Old 05-20-2015, 09:38 PM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,413
Thanks: 18
Thanked 382 Times in 369 Posts
Rep Power: 529604
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

TPS at 1.9% is not normal, at least on my jeep it sits around the 12%. Could be that the crank sensor is pulling down the 5V for the sensor feed. You could measure the voltage at the TPS, or just disconnect the crank sensor and see if the TPS reading comes back to a value above the 10%. If so, then you are sure the crank sensor is faulty. If you want to measure on the TPS, then the 5V feed is on pin 1 of the TPS connector.
I would not worry about the transmission problem at this point, but first solve the engine problem, because you never know if the engine problem is causing the transmission problem.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #9  
Old 05-22-2015, 08:30 PM
Member
 
Join Date: May 2015
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 654
jbanks25 is on a distinguished road
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

Question for you guys, do you have any idea if this information is correct? (I found it on another forum)

Fuse Number 10 is dedicated to Transmission range sensor, duty cycle evap/purge solenoid, radiator fan relay, a/c clutch relay, o2 sensor up/downstream relays, back up lamp switch

Since I'm throwing codes with the fan, O2 sensors and transmission range if this is correct info I feel like I've got a pretty clear indication of what circuit I need to try to trace. Too big a coincidence that all the codes come form one place if this is true.
Reply With Quote
  #10  
Old 05-22-2015, 08:32 PM
Member
 
Join Date: May 2015
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 654
jbanks25 is on a distinguished road
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

Also, another interesting situation. If I plug in my scanner and erase the codes (Key on but not started) Al the codes will go away, but I will kill the Jeep. Usually if it has it's starting problem you can pull the negative cable and put it right back. After erasing codes, pulling the cable doesn't help right away. Yesterday I had to leave it overnight.
Reply With Quote
  #11  
Old 05-23-2015, 08:21 AM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,413
Thanks: 18
Thanked 382 Times in 369 Posts
Rep Power: 529604
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

Quote:
Originally Posted by jbanks25 View Post
Fuse Number 10 is dedicated to Transmission range sensor, duty cycle evap/purge solenoid, radiator fan relay, a/c clutch relay, o2 sensor up/downstream relays, back up lamp switch
I donīt know where you have red this, but it is not true. Fuse 10 in the PDC i only see for the rad cooling fan (4.0L). My schematic (99-00MY) doesnīt show the electric fan for the 4.7L.
All the other components you mentioned are fed via other fuses:
EVAP/purge solenoid- fuse 21 on Junction block (JB)
TRS gets power from fuses 12 and 31 on the JB
AC compressor from fuse 21 on JB and fuse 21 in PDC under the hood
O2 sensors fed via fuse 16 in PDC
Back-up lights from fuse 20 on JB

So there is no connection in the power feed for the systems you have mentioned.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #12  
Old 05-23-2015, 08:33 AM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,413
Thanks: 18
Thanked 382 Times in 369 Posts
Rep Power: 529604
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ 1999 4.7 codes P0130, P0136, P1491, P0731 Please help

Quote:
Originally Posted by jbanks25 View Post
Also, another interesting situation. If I plug in my scanner and erase the codes (Key on but not started) Al the codes will go away, but I will kill the Jeep. Usually if it has it's starting problem you can pull the negative cable and put it right back. After erasing codes, pulling the cable doesn't help right away. Yesterday I had to leave it overnight.
The jeep will not start and the instruments donīt work as well? Did you already try a new crank sensor? If the crank sensor shorts out, the engine will not start and hearing from others the PCM will not give any output for the instruments. If checking the wires for shaving didnīt reveil anything, i would start with a new crank sensor and see how it behaves then.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
CEL Codes and Help Please. KillaJeep4569 Troubleshooting/Problems 2 04-12-2015 08:02 PM
2010 grand DTC codes,need help please tardis Troubleshooting/Problems Discussion 1 05-30-2014 08:31 PM
codes P0731,P0732,P0734 dbear Troubleshooting/Problems 9 07-18-2013 10:34 PM
P0731 Error Code / Emissions KathieAlvarez Troubleshooting/Problems 1 02-29-2012 03:02 PM
P0731 Gear 1 Ratio Incorrect jas535 Troubleshooting/Problems 1 08-14-2010 03:59 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 02:00 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.