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Diagnostic Trouble Code: B0408
Diagnostic Trouble Code Name: Drivers Air Mix Door Motor Circuit
Vehicle Make: Chevrolet
Vehicle Model: Omega (C (VE))
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Please Note: The DTC Information provided has been randomly generated.
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Diagnostic Trouble Code Description:
Output Speed Sensor Circuit Intermittent
Possible Sensor Faults
TCM
Possible Related Diagnostic Trouble Codes
DTC P0722 or P0723
Circuit / System Description
The automatic transmission?(AT) input and output speed sensor (ISS and OSS) assembly each are part of a single harness. The OSS is a hall-effect type sensor. The OSS mounts to the control valve upper body assembly. The assembly connects to the control solenoid (w/body and TCM) valve assembly through a 3-wire harness and connector. The sensor faces the output shaft machined teeth surface. The sensor receives 8.3-9.3?volts on the input/output speed sensor?(ISS/OSS) supply voltage circuit from the transmission control module?(TCM). As the output shaft rotates, the sensor produces a signal frequency based on the machined surface of the output shaft. This signal is transmitted through the OSS signal circuit to the TCM. The TCM uses the OSS signal to determine line pressure, transmission shift patterns, torque converter clutch?(TCC) slip speed and gear ratio.
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