2010 Range Rover Sport Transfer Case P0806

Keegan Diagnostician Indiana Posted   Latest  
Resolved
Drivetrain
2010 Land Rover Range Rover Sport HSE 5.0L (D) 6-spd (6HP28) — SALSF2D41AA216623
P0806 — Clutch Position Sensor "A" Circuit Range/Performance

Vehicle was brought to us after replacement of the Transfer Case for unknown reasons by a local Transmission Shop. Attempting to calibrate the New Transfer Case fails every time. Transfer Case Control Module stores DTC P0806 - Clutch Position Sensor Range/Performance. Transfer Case Motor has 2 Hall Effect Sensors (One for Motor Speed and One for Motor Direction. JLR SDD shows Direction Sensor should be 12 Volt Analog Signal (I'm assuming this is a Ratiometric Hall Effect Sensor) and Speed Sensor (I'm assuming this is just a Hall Effect Switch) should be 5 Volt Digital Signal. Scan Tool Data is showing both sensors at 8 Volts. With Transfer Case Motor Unplugged, I get 9.5 Volts on both Hall Effect Signal Circuits A and B From TCCM. Just wondering If anyone has more information on what kind of voltages I should be seeing from TCCM. My assumption is I should get 5 Volt on Speed Sensor and 12 Volt on Direction Sensor Circuit with Connector Unplugged. Service Information is almost non existent on this system. Thanks in advance. 

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Interesting
Allen Owner/Technician
Texas
Allen Default
   

Have you pulled the connector on the tccm? Recall is behind battery on firewall. Notorious for corrosion and melted pins.

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Keegan Diagnostician
Indiana
Keegan Default
 

I pulled the connector at the TCCM. The connectors and module look pristine.

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Laurence Student
Alberta
Laurence Default
 

I'm with Allan, check the connectors for corrosion and/or loose / poor connection. Does the harness on the transfer case side look good or like a ham-fisted chap pulled it apart? I know you are working on someone else's project, but it would probably help to know the "why was it replaced" as well as "where did the replacement come from; new / used / reman"? Do you have continuity on circuits…

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Keegan Diagnostician
Indiana
Keegan Default
 

The harness at the Transfer Case looks in good shape. It definitely looks like a used transfer case. All circuits in Transfer Case Motor are within Resistance Specs given by Land Rover. I have also checked for shorting to power, ground, and each other within the harness between TCCM and T/Case Motor. When attempting to perform the calibration, I can hear the T/Case Motor try to move and then…

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Laurence Student
Alberta
Laurence Default
   

The voltage differences is definitely odd, there is no doubt! Especially when following the test plan in SDD giving the specifications for the voltage. I would agree that the motor is likely in need of replacement, but what is the inside of the case like? (Edited: is it worth it to put a motor on a pounded out unit?) Fluid levels topped up, with appropriate fluid? Curious, does the truck…

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Keegan Diagnostician
Indiana
Keegan Default
 

The vehicle runs and drives fine. There is a flashing Low Range Light in the instrument cluster and the icons next to the range switch are flashing. I do not know what the internals of the Transfer Case look like. I will most likely pull to Transfer Case Motor tomorrow and take gander.

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Caleb Diagnostician
Indiana
Caleb Default
   

Can you throw a scope on all 4 hall effect sensor circuits during the calibration and post the results? The 9.5 volts is a bias from the TCCM to self test the signal circuit. The 2 sensors get there supply/reference voltage from pin 3 and they get ground from pin 7 at the TC Motor C2167.

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Keegan Diagnostician
Indiana
Keegan Default
 

Attached are 2 Attempts at Calibration. It looks like the speed sensor is reading some kind of movement.

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Laurence Student
Alberta
Laurence Default
 

Caleb's question sparked another question, zero pun intended! What are you seeing for voltages at the supply pins at the TCCM before it gets to the position sensor? Or, is that what you had provided earlier? I gathered that you were providing the output voltage AFTER the sensor and not before. Is the TCCM functioning properly? Again, I know working on someone else's problem after the fact, but…

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Caleb Diagnostician
Indiana
Caleb Default
 

Boom! Thanks so much for responding with PICO files. I believe you have already diagnosed the car. There is clearly no signal from Sensor A. You said one sensor is for motor speed and one for direction. As far as I am concerned you cant have one with out the other. In other words the motor must be moving in order to create a speed or direction signal. So the fact that you have one creating a…

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Carlos Owner/Technician
United Kingdom
Carlos Default
 

Have you removed the transfer case motor and tried to rotate the drive by hand? I have had a problem like this that the spindle would have resistance at both end stops and then move without resistance in between. It should have resistance throughout its whole rotation as it shifts inside the box.

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Keegan Diagnostician
Indiana
Keegan Update
 

Okay. I have some additional info on this car. The Transfer Case was replaced for noise while driving. This issue was not present before the Transfer Case was replaced. The replacement T/Case is a used unit. The Trans Shop swapped all electronics from the original T/Case to the used one before installing in vehicle. I retrieved the Transfer Case Motor that came with the used T/Case for testing…

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Caleb Diagnostician
Indiana
Caleb Default
 

Sounds like you are right on the money! Nice work.

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Carlos Owner/Technician
United Kingdom
Carlos Default
 

youtu​.​be/D5iUEM5N3a0 Take a look at this.

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Keegan Diagnostician
Indiana
Keegan Resolution
   

This Vehicle is finally fixed. The fix was to reset the Changeover Shift Fork inside the Transfer Case. My assumption is the Trans shop swapped both the Transfer Case Motor and Changeover Solenoid from the old T/Case to the new one. They must of removed both at the same time. This caused the shift fork to slip off off the dogteeth of the High/Low Range Actuation Cam. The shift fork must of…

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Don Diagnostician
Tennessee
Don Default
   

Thanks to all for this excellent thread, and thank you, Keegan, for posting your resolution. I apologize in advance for the length of this post, but I hope you may be able to help me resolve a similar problem on a 2012 Range Rover HSE LUX. It presented with the Gearbox Fault warning on the instrument cluster and the relevant DTC was P181D-00, Clutch Actuator Changeover Solenoid –…

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Keegan Diagnostician
Indiana
Keegan Default
 

Sorry about the delay in responding. I recently had surgery and have been out of work recovering. When you removed the solenoid for testing, did you use the scan tool to perform the Changeover Solenoid Replacement procedure? This procedure sets the linkage up for solenoid removal. If not, then the changeover arm could be in neutral. If you push the change over arm in (away from the solenoid…

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Don Diagnostician
Tennessee
Don Default
   

Hi Keegan, Thank you for your kind reply. I hope you are doing well in your recovery. I had figured out that I needed to pull the lever toward the opening and turn the shaft until the changeover arm engages the High/Low cam. I could then use the motor or a pair of pliers to turn the motor shaft between the High and Low detents. I've tried moving the shaft to about half-way between the detents…

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