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Content .. 997 998 999 1000 ..
DRIVE or REVERSE, the transmission continues to the commanded range until output High Output Speed Direction Change Shifts REVERSE to DRIVE, DRIVE to REVERSE, and NEUTRAL to REVERSE shifts, Low Automatic Transmission Fluid (ATF) Level Low Low ATF level is caused by insufficient transmission fluid and lack of initial pump prime, Extremely Low ATF temperature A shift out of NEUTRAL when the ATF temperature is below -45°C (-49°F) may be MALFUNCTIONS Which May Cause a Blinking PRNDL Failure to detect turbine speed pull-down during a shift may occur under the following A clutch is failed and the transmission cannot attain the requested range. Invalid gear ratio Pressure control solenoid failure Turbine or output speed sensor failure Lack of pressure at startup Conditions Which May Cause a BLANK PRNDL The PRNDL display may be blank because of failure of the internal mode switch circuits A, B, C, The transmission will command the most appropriate range, based on reverse pressure switch and ELECTRONIC COMPONENT DESCRIPTION
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Transmission Control Module Fig. 517: Transmission Control Module A microcomputer controls the transmission by receiving and processing signals from various
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
technician, are used in diagnosing persistent or intermittent trouble in the system. Throttle Position/Torque Management The TCM receives input on throttle position/torque management from a signal transmitted by the The ECM communicates directly to the transmission electronic controls over an SAE J1850 or Speed Sensors
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 518: Speed Sensors There are 3 speed sensors typically required for use with 1000 Series transmissions. They include IMPORTANT: Do not rotate the sensor in the retaining bracket. Changing the sensor/bracket orientation may cause improper operation.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Content .. 997 998 999 1000 ..
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