LR3 Electrical Issues

jymmiejamz

Founding Member
Callsign: KN4JHI
So you should be getting 60 ohms between those pins. There are two terminating resistors in the CAN bus. On the medium speed side, it is the instrument pack and the central junction box. Each of these are 120 ohms, but when the network is connected, since everything is in parallel , the resistance of the network should be 60 ohms. Now the you have found there is a problem in the total resistance, you need to isolate which half of the network is the problem.

The best place to split the network is at connector C2411/C2412. The pins you are checking this time will be pins 12 and 13 on that connector. One side will likely read 120 ohms and the other side will not. The side that isn't 120 ohms is where we need to look next.
 

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waveridin1959

Well-known member
I misspoke earlier. I did get a reading around 60 ohms for this pins with the battery out.

The battery voltage was 12.78 sitting and 13.78 running. I put a charger on the battery to see if I could trick the system into thinking it was stronger. Did a hard reset and the same Instrument Pack fault popped out.

At this point, I think i'm going to get it diagnosed at a Indy Rover Mechanic. I will post back what comes from it.
 

waveridin1959

Well-known member
The issue was the headunit went bad. The shop is going to take the unit apart to see what failed. The headunit failing caused all sorts of other issues. Its amazing how integrated these trucks are.
 

1of40

Well-known member
The issue was the headunit went bad. The shop is going to take the unit apart to see what failed. The headunit failing caused all sorts of other issues. Its amazing how integrated these trucks are.



Understatement of the year. Stories of what a bad taillight bulb can cause is disturbing. Hopefully the next gen will have some intelligence built in.
 

broncoduecer

Technical Excellence Contributor
@jymmiejamz I’ve been having some odd things happening lately and many of my codes are communication related. I’ve rebuilt my compressor and replaced the leaking plastic drier cap with a metal one, but it’s not to say the compressor still isn’t on its way out. I need to drive around with live values and see if any height sensors are out of whack.
To rule out any can bus fun I ran your tests and got the following:
Bat voltage off: 12.39
Bat voltage run: 14.16

Running
Volts at 3: 2.65
Volts at 11: 2.33

Bat disconnected Resistance between
3 and 11: 62.3
3 and ground: 11500
11 and ground: 10500

Bat connected engine on or off, resistance between
3 and 16: 0
11 and 16: 0

While driving a few times we have gotten an air suspension fault. It says I’m in extended mode sometimes but it doesn’t appear to be. This has happened in normal and off Road height. Last group of codes were:
c1131-92
u0132-87
u0159-87
slew of ventilation codes
Let me know your thoughts!
Thanks,
Peter
 

jymmiejamz

Founding Member
Callsign: KN4JHI
@jymmiejamz I’ve been having some odd things happening lately and many of my codes are communication related. I’ve rebuilt my compressor and replaced the leaking plastic drier cap with a metal one, but it’s not to say the compressor still isn’t on its way out. I need to drive around with live values and see if any height sensors are out of whack.
To rule out any can bus fun I ran your tests and got the following:
Bat voltage off: 12.39
Bat voltage run: 14.16

Running
Volts at 3: 2.65
Volts at 11: 2.33

Bat disconnected Resistance between
3 and 11: 62.3
3 and ground: 11500
11 and ground: 10500

Bat connected engine on or off, resistance between
3 and 16: 0
11 and 16: 0

While driving a few times we have gotten an air suspension fault. It says I’m in extended mode sometimes but it doesn’t appear to be. This has happened in normal and off Road height. Last group of codes were:
c1131-92
u0132-87
u0159-87
slew of ventilation codes
Let me know your thoughts!
Thanks,
Peter

Nice work with the clear and concise tests you've done so far! You've gone further than most mechanics ever would.

What are your exact symptoms and faults? Let's start looking for horses and not zebras.
 

broncoduecer

Technical Excellence Contributor
Thanks!
Early summer I rebuilt my compressor and changed the drier desiccant preemptively and a month or so later started having problems because It seemed to run for a long time so I wanted to try and get ahead of it.
I’ve had a few issues this summer. First time after a lot of rough dirt roads I stopped for a break and while idling was getting a bell saying I was in extended mode but I was in normal. I lowered to access and then to normal height and it cleared that, but then shortly after that I had an air suspension fault and icon saying normal suspension only. I don’t recall the code but was able to search the net where I was parked and it was one that was saying the compressor wasn’t keeping up. Cleared the code went on my way and it came back on the way home, suspension fault dash light and normal mode message.
Next day looked closer at the compressor, thinking maybe my rebuild was bad and discovered the crack in the plastic cover. Replaced that with the metal one and I was all good for awhile.
Then a few weeks later one a easy dirt road in off road mode I kept getting random extended mode warnings. I could lower and go to normal and it would be fine.
I had one real rough rocky river gravel trail a few weeks ago and no issues at all. I really gave the air suspension a work out and no errors or weird extended mode warnings.
A couple days ago my wife was driving back from MT in the cold temps and on the flats going 65 got the air suspension fault normal mode and light. She pulled over in a few miles and shut the vehicle off and started it again and gone. The pics attached are of the codes I just pulled and I assume are related to the event. Funny to see the vent system ones because my wife was saying it was acting odd, blowing cold when it was set to 80.
So a few things going on. Haven’t driven it since she’s gotten back. I’m going to drive it Tuesday to an appointment and see if anything happens. 150k on the clock now and still the original bags. I bought the o rings to rebuild the valve blocks. I get sagging if it sits for more than 5 days. haven’t done that yet but don’t think it’s the problem.
thanks!
 

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Roverman2010

Well-known member
Thanks!
Early summer I rebuilt my compressor and changed the drier desiccant preemptively and a month or so later started having problems because It seemed to run for a long time so I wanted to try and get ahead of it.
I’ve had a few issues this summer. First time after a lot of rough dirt roads I stopped for a break and while idling was getting a bell saying I was in extended mode but I was in normal. I lowered to access and then to normal height and it cleared that, but then shortly after that I had an air suspension fault and icon saying normal suspension only. I don’t recall the code but was able to search the net where I was parked and it was one that was saying the compressor wasn’t keeping up. Cleared the code went on my way and it came back on the way home, suspension fault dash light and normal mode message.
Next day looked closer at the compressor, thinking maybe my rebuild was bad and discovered the crack in the plastic cover. Replaced that with the metal one and I was all good for awhile.
Then a few weeks later one a easy dirt road in off road mode I kept getting random extended mode warnings. I could lower and go to normal and it would be fine.
I had one real rough rocky river gravel trail a few weeks ago and no issues at all. I really gave the air suspension a work out and no errors or weird extended mode warnings.
A couple days ago my wife was driving back from MT in the cold temps and on the flats going 65 got the air suspension fault normal mode and light. She pulled over in a few miles and shut the vehicle off and started it again and gone. The pics attached are of the codes I just pulled and I assume are related to the event. Funny to see the vent system ones because my wife was saying it was acting odd, blowing cold when it was set to 80.
So a few things going on. Haven’t driven it since she’s gotten back. I’m going to drive it Tuesday to an appointment and see if anything happens. 150k on the clock now and still the original bags. I bought the o rings to rebuild the valve blocks. I get sagging if it sits for more than 5 days. haven’t done that yet but don’t think it’s the problem.
thanks!
COILS!!! wait till you have to drive 2miles on the bump stops, never mind 800
 
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