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Whenever you get a service 4WD system warning light, you may want to have a closer look. This message indicates that the transfer case control module is sending commands to the front differential actuator.
However, the front differential is not locked. A bad connection between the encoder and actuator can cause this problem.
A technician should read the fault code and follow the SI diagnostics to isolate the problem. This will allow you to restore the system to proper operation.
The encoder is a little motor that turns the gears inside the transfer case. A bad connection between the encoder and the transfer case can also cause the 4WD system to fail.
The encoder should be replaced. The new encoder should be gently slid over the shaft of the motor. It should fit the cover of the motor fully, and should be flush with the motor housing. The hex notch on the encoder should match the notch on the shaft. This will allow the encoder to be aligned correctly.
If you do not know where the encoder is located, a transmission shop should be able to help you. The encoder can be found in the transfer case control module, and is responsible for locking the front differential.
If you do not have access to the transfer case control module, a technician should be able to locate it using a scan tool. Various software updates may also be required.
Upon completion of the service, the 4WD system should work properly. If the system does not, there may be other issues that can prevent the vehicle from operating properly.
Some problems include bad contacts between the dash buttons, a loose wiring harness, or a faulty transfer case speed sensor. The transmission shop may recommend a new encoder motor.
Alternatively, the transmission shop can replace the entire transfer case. If you choose this option, be sure to check the transfer case’s fuse to make sure it is not damaged. After the service is completed, the TCCM fuse should be reinstalled.
The four wheel drive system uses a series of electronic controls and dash-mounted mode switches to provide a wide range of driving options. These systems can be prone to malfunctioning, especially during sharp turning maneuvers.
Fuel sensor/sending unit
Normally, the fuel sending unit is located inside the gas tank. It sends data to the PCM – engine computer. The ECM/PCM stores a failure code for the sending unit if it fails.
Typically, the sending unit has two keyed areas. One is the lengthier side of the metal arm and has a brass float. The other keyed area has a foam plastic float.
When the float moves upward and down, the contacts change resistance to indicate the level of the fuel. If the float is not functioning correctly, it can affect the reading on the fuel gauge.
If you have a fuel gauge that is not functioning properly, it may be due to a failed or missing sending unit. The ECM/PCM will detect the sending unit’s failure by checking the voltage.
If the voltage is too high, the powertrain control module will set a code. The P0463 code is a common error for a failing fuel level sensor. You can check for this fault by following the steps below.
First, you must remove the sensor from the gas tank. This is a complicated procedure. The sensor has a resistive strip that runs along the inside of the metal arm.
When the float moves, the contacts on the strip change their resistance to indicate the fuel level. Then, you must replace the fuel sending unit. If the sending unit is working properly, the sensor should not be needed. If it is not, you will need to replace the sensor.
Once the sending unit is removed from the fuel tank, it can be difficult to replace it. The contacts can wear out and not contact the strip, or they can be shorted to the ground.
Alternatively, the circuit to the sending unit can be damaged. The contacts can also be chewed. If the contacts are not contacting the strip, then the sending unit is broken or worn. It is a good idea to test the sensor’s resistance before replacing it. If the test is successful, the sending unit is probably faulty.
The PCM/ECM will not communicate with the factory after the sending unit has failed. If the PCM/ECM cannot communicate with the factory, the vehicle may not pass the OBD II plug-in emissions test.
#Transfer case motor
Generally, a transfer case motor is used to shift the vehicle into four wheel drive. It can also increase the speed of the car. It transfers energy from the transmission to the axles to power the vehicle. A transfer case has a large number of system components. The transfer case is designed to last for a long time.
The transfer case motor is connected to the vehicle through the transfer case control module (TCCM). The TCCM is located under the dash behind the steering column. If the TCCM fails to work, the vehicle will not shift into the 4WD position.
To diagnose the problem, you must perform a test of the transfer case motor. You can check its operation by using a jump pack or by using a portable jump starter. If you see any problems, you may need to replace the TCCM. The cost of a new one can range from $50 to $80.
If your vehicle has a trouble code C0327, it means that the transfer case motor has a problem. You may also hear strange noises such as a rattle drone or buffeting noise. This could be a result of a bad seal or internal transmission fluid leak.
If the transmission fluid level is low, you may notice a humming noise. You can also find a warning light on the dashboard. If the warning light stays on continuously, it indicates that the system is malfunctioning. The humming noise can be worse at highway speeds. You should also check the oil level to avoid any lubrication issues.
The transfer case encoder circuit is made up of three circuits. The signals from the encoders should be in the range of 0.5 to 4.5 volts. If the signal falls outside the range, the encoder sensor may be worn or malfunctioning. If this happens, it can cause the engine to hesitate or stall. It can also cause 4×4 performance issues.
Before replacing the transfer case motor, you must also inspect the TCCM wiring harness. This is the most important electrical connection. You should ensure that it has a good pin/terminal fit and a proper ground path.
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