845RE Park-by-wire malfunction Transmission Digest August 2024

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Park-by-wire pin pain with the 10R80 transmission

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Codes vs Faults 2010 Dodge Ram

 This 2010 truck came in with three fault codes active. Instead of walking you through the testing, let's just go right to what was causing each code to set. 

Here they are: P0522, P1281 and P0456

P0522 was a leaking oil pressure sensor. 

P2181 was a poor connection at the coolant temperature sensor. 

P0456 was a bad gas cap seal. 

Now there was also a complaint of long cranking time at start, intermittently. These do have known problems with the fuel pump relay, which is built into the TIPM but the complaint could have also been caused by the poor coolant sensor connection. Since the problem hasn't appeared and since it could possibly be fixed via cleaning the connection, I've elected to do the wait and see option on that particular problem. 

Kenny@G&GAuto.Repair

Battery Drain Testing 2002 Dodge Ram

 This one gets a quick charging system check while it is running and looks good. 

I'll be disconnecting the battery for testing but want to keep the electrical system powered up so will connect the memory saver but first, just in case, I do a quick code scan. 

The battery tests good but the tester asked for me to verify the ambient temperature was above freezing which you don't usually see unless there is a questionable test result. Mental note made. It does need a full charge so going ahead with the charge while the battery is disconnected. 

Once the current draw was measured I did find excessive draw. I was told the truck was okay day to day but battery would drain over a weekend. This amount of draw would fit into that scenario. Once you find your draw you have to determine which circuit the draw is on. That is a matter, at first of removing fuses one at a time until you see the draw drop to an acceptable range. I found the problem was on fuse 4 of the underhood block. 

The odd thing about fuse 4 having the draw is that fuse feeds battery voltage directly to the ignition switch and doesn't feed power to anything until the switch is turned on. I suspected someone had been doing some accessory wiring or along those lines. 

I went right to the ignition switch and found someone had bypassed the ignition switch on that circuit and fed the power through a relay instead of through the switch. The problem was the relay was always on. The excessive draw was the relay. 

I'll need to repair the wiring and replace the ignition switch. Getting rid of that relay and going back to original design. 

Now we have an acceptable draw. 

Thanks for reading,

Kenny@GGAuto.Repair

Checking A/C on 1998 Dodge Ram 1500

 "The air conditioner isn't working" was the complaint on this older truck. A look under the hood at the visible parts of the system and I could see the clutch cycle switch had been leaking. When refrigerant leaks from a system it not only emits the refrigerant gas but some of the refrigerant oil as well. So if you look for signs of oil seepage you can spot a leak without having to grab a leak detector or black light. In this case the only oil residue was below the cycle switch at the dryer. It looked like a small leak so I expected to find the system with a low charge but not empty. I connected the low pressure side to the recovery machine and did indeed have some refrigerant pressure. 

Now with that pressure reading you can tell there is enough refrigerant in the system that the compressor should be able to engage. You can't tell if how much refrigerant is in there. If the system is low and the compressor is engaged then the low side should be lower than you would normally expect to see on a fully charged system. When I turned the A/C on, the low side did go lower than normal and the suction hose was only cooling at 58F. Which was only slightly below room temperature in the shop at the time. 

We know the system is low but can't do a proper charge without knowing just how much refrigerant is in there so the next step is to connect the high side as well to the recovery machine and recover the system charge. 

The recovered refrigerant is weighed and reported by the recovery machine. A full charge is 2lb, we recovered 1lb 5oz. Also, like with a leak, some oil is recovered along with the refrigerant. The oil is separated into a bottle and measured so you can see how much to add on the charge. 

 This was a good time to change that cycle switch. 

Next up, evacuate to remove air and moisture followed by a system charge. 

Now it is pulling down to 39F.

On to the next job.

Kenny@GGAuto.Repair

Battery Keeps Going Down Update

 The 2013 Silverado testing showed good battery, alternator and no excessive draw so I had decided to look at a full scan for clues. 

The ground at G302 looked like a good place to inspect after I monitored the voltage at the passenger presence module and found it to be dropping to 8 volts during a crank. Looking under the passenger seat I found several loose tools stored there. The socket set was in a case but screwdrivers and crescent wrenches all were laid loosely. Both screwdrivers had worn into the wire harness. I removed the tools and placed them in bag. I put the tools in the passenger rear floor (extended cab). I cleared the codes and monitored the voltage for several starts and now the drop was  to 10.5 volts during cranking which should be fine. I did not access the ground which would require seat removal as it seems fine now. No codes have reset. 

Now did the "fix" address the battery complaint? I don't know. It will be a wait and see but I do seem to have taken care of the problem I did find. 

Kenny@GGAuto.Repair

"Battery Keeps Going Down"

 I had three of these "battery loses power" jobs to look at today. I enjoy electrical work. It usually can be done in a logical process vs mechanical problems which can be anything. <grin> Typically on an electrical system diagnosis you will start at the battery. You need a good and fully charged battery for tests to be relevant. It isn't good enough to just assume it is fine. You test. I like to test the battery by first disconnecting it from the questionable system so that there is no interference. Before disconnecting the battery on the 2002 Avalanche I connected a memory saver to the system which is a sort of portable auxillary battery that will keep the truck's system memories intact while I test the battery. 

The battery was good but would need a full charge. I like to use low amperage and slow charging because it is the most stable and reliable but it does take a few hours. 

Once the battery was fully charged and cables reconnected, I removed the memory saver. Because the truck system never lost a power source I didn't have to wait for the system to enter sleep mode, it was already there. I could immediately test both the main circuits feeding from the ground side and found current draw well within acceptable range. 

I also found the alternator to be working properly. 

So, the battery was good, alternator good and no excessive draw on the battery. What was the problem? When I was disconnecting the battery terminals I had noticed the ground cable was not fully tight and it would not tighten when I did try the bolt. I went ahead and disconnected for the testing but once I was reconnecting the battery I could see the ground bolt was stripped. A new bolt tightened fully and I had a good connection. So what I found bad was a ground terminal connection at the battery due to a stripped bolt. 

Next up was the 2001 Crown Vic. The battery was completely drained on it and it was a new battery. I had to disconnect the battery from the car to even get it to begin charging so I knew this one had excessive draw. Once I was able to test current draw on this one, I could see why the battery was dead. 

Instead of starting by isolating circuits I thought that just might be something I could see on, like a trunk light or glove box light or something. I noticed a glow inside and there was something connected to the power outlet inside the car and the connector led was lit up. It was an aftermarket seat warmer on the passenger seat. The switch of the warmer had 3 settings but all were drawing power. I disconnected the warmer and all was good. 

Now the 2013 Silverado battery was up to 90% so didn't take long to reach full charge. Alternator tests good and all three of the main circuit feeds from positive post have draw within specs. 

Not sure what I'll find there but at least gonna let it sit overnight. It isn't unheard of for a computer to suddenly wake up on occasion and turn a few things on that shouldn't be. Gonna do a full system scan for clues and see what it does overnight. 

Kenny@GGAuto.Repair