How do you test an output shaft speed sensor?
To check the sensor output, turn the DVOM to AC Volts. Rotate the wheel or whatever speed you are measuring. Place the meter leads across the sensor and measure the AC voltage output. Typically, if the shaft is rotated at about one turn every 2 seconds the output should be around.
How do I know if my transmission speed sensor is bad?
- Transmission revs higher before it changes gears.
- The car’s transmission engages into overdrive late and sometimes will never go into that top gear.
- Brakes are sometimes harder than normal when coasting.
- Speedometer behaves erratically or sometimes does not work at all.
Can I drive with a bad transmission speed sensor?
A bad transmission speed sensor makes for rough and difficult gear changes, and can leave you without an accurate speedometer. All this adds up to a dangerous drive, worsened by the fact that your car is probably less efficient, and producing more harmful emissions.
What causes a transmission speed sensor to go bad?
Over time, the transmission speed sensor can go bad due to wiring issues or just outright failing due to it constantly being used every time you are driving your vehicle. If the sensor is magnetic, it can go bad from iron sticking to the tip of the sensor, which will cause an inaccurate reading.
Can you test a transfer case control module?
You have to perform a TCCM self-test to determine whether you need to change this component or not. Turn the ignition switch while observing the transfer case shift control switch indicators. A functioning TCCM will flash all the indicators before returning to the current gear.
Where is the transfer case control module located?
Where is the transfer case control module located? Transfer Case Control Module: This is the system’s brain. It is located under the dashboard above the parking brake pedal, behind a large metal bracket.
What is the transfer case control module?
The Transfer Case Control Module (TCCM) is the brain behind the electronically shifted GM 4WD systems. The TCCM processes the shift request from the dash mounted mode selector buttons, executes the shift, and verifies the shift was completed.
How do I know if my transfer case shifts a motor?
The transfer case control module controls only the transfer case, and is located inside the truck. If you remove the trim panel under the steering column you will find the transfer case control module mounted just to the right of the opening. The shift motor is located just behind the axle tube to prevent damage.