The Throttle Position sensor signals the Engine Control Module as to the current position of the engine throttle valve.
The current throttle valve opening is based on the driver's input from the gas pedal. The ECM uses the information from this sensor to help calculate fuel delivery and spark timing.
Gear changes are accomplished by a command from the TCM to energize the clutch actuator to release the clutch; after which various actuators inside the transmission disengage the current gear, and depending on current operating conditions, engage the next higher or lower gear ratio. All of this happens much faster than a human driver could change gears, and in most applications, gear changes are as smooth and seamless as on any fully automatic transmission.
Difficulty Level (Expert)
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Repair Time (35 Min.)
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| Cost Prediction : $ 40-75 |
If your transmission transfer case system concern - servicing required check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system U3902 and engine control unit are in charge of monitoring a bunch of different transmission transfer case system concern - servicing required, and if they get a reading that's a little out of whack, up pops the check engine light.
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U3902 is a kind of Network Trouble Code
U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason. |
You can view according U3902 DTC for your car model. We selected several models to see obd2 solutions click and view it.
| +U3902 Mazda 929 | +U3902 Oldsmobile Alero | +U3902 Renault Espace 5 | +U3902 Zaz Wagon | +U3902 Suzulight Van |
Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.
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