"Service 4wd" message
#11
TECH Resident
Thread Starter
It works! I believe that part is called the range sensor? Around $20 including shipping from RockAuto.
I checked the resistance of the old one and it was erratic while rotating it.
Range sensor is under the larger gear. It has 3 wire connector.
Black wheel is range sensor. AllData has instructions on "timing" it on reinstalling. Just mark the line of the gear against the case mark.
I checked the resistance of the old one and it was erratic while rotating it.
Range sensor is under the larger gear. It has 3 wire connector.
Black wheel is range sensor. AllData has instructions on "timing" it on reinstalling. Just mark the line of the gear against the case mark.
The following users liked this post:
silentbravo (02-26-2023)
#12
TECH Resident
Thread Starter
Ok, I'm back working on this truck. I've got a P2068 code, which says "Fuel Level Sensor 2 Circuit High Voltage". If I clear the code the fuel gauge shows correct for about 30 seconds, then goes to zero and that little led low fuel indicator illuminates. This issue wasn't there when I bought the truck, but it's been sitting.
I've never dealt with these dual fuel tank setups before. I found the wiring diagram and it looks like the secondary tank has its own sender (along with another pump) to the ECU.
I'm going to try to measure the voltage at the ECU and see what it is. I found a video that says it's like a 5 volt reference signal. Was really helpful.
https://youtu.be/M31XF3PYmJE
I've never dealt with these dual fuel tank setups before. I found the wiring diagram and it looks like the secondary tank has its own sender (along with another pump) to the ECU.
I'm going to try to measure the voltage at the ECU and see what it is. I found a video that says it's like a 5 volt reference signal. Was really helpful.
https://youtu.be/M31XF3PYmJE
Last edited by strutaeng; 08-22-2023 at 10:43 AM.
#13
TECH Resident
Thread Starter
Here is the wiring diagram showing the fuel pump sender:
#14
TECH Resident
Thread Starter
Well, I got into the ECU and backprobed that pin and I got a pretty steady 3.70 VDC. Clearing the code didn't do anything.
Now that I think about it, the fuel tank is about 1/4 full. If this is a 0-5V range, maybe my voltage should be closer to 1.25 VDC? 0.25 x 5 VDC = 1.25 VDC?
Maybe I will try adding gas or banging on the tank to see if that floating sensor maybe got hung up inside.
Now that I think about it, the fuel tank is about 1/4 full. If this is a 0-5V range, maybe my voltage should be closer to 1.25 VDC? 0.25 x 5 VDC = 1.25 VDC?
Maybe I will try adding gas or banging on the tank to see if that floating sensor maybe got hung up inside.
Last edited by strutaeng; 08-22-2023 at 09:11 PM.
#16
TECH Resident
Thread Starter
Nothing yet. I did put more fuel in it and drove it a bit doing a few WOT and panic stops. But the fuel guage going wonky still returned. I plan on replacing the fuel sender at some point.
Have another issue with the cluster and parasitic draining the battery, so I want to fix that first.
Have another issue with the cluster and parasitic draining the battery, so I want to fix that first.
Thread
Thread Starter
Forum
Replies
Last Post