T56 Transmission, Description & Operation
#1
07-20-2007, 06:26 PM
T56 Transmission, Description & Operation
T56 Manual Transmission Description and Operation
Manual transmissions are identified by the number of forward gears and the measured distance between the centerline of theoutput shaftand the counter gear. The 6-speed, 85 mm manual transmission, used in the Camaro/Firebird, incorporates the following features:[*]An aluminum case[*]Fully synchronized gears with an enhanced synchronizer cone arrangement:[*]Triple-cone: FIRST, SECOND[*]Double-cone: THIRD, FOURTH, FIFTH, SIXTH[*]Single-cone: REVERSE[*]An internal shift rail mechanism[*]Tapered roller bearing supporting the mainshaft and countershaft[*]Caged roller bearings under ail speed gears[*]Solenoid inhibit of SECOND and THIRD gears[*]Solenoid inhibit of REVERSE gear during predefined forward motion
Gear Select - Skip Shift (CAGS)
To ensure good fuel economy and compliance with federal economy standards, SECOND and THIRD gear are inhibited when shifting out of FIRST gear, under the following conditions: [*]Coolant temperature is above 50°C (122°F)[*]Vehicle speed is 20 - 29 km/h (12 - 19 mph)[*]Throttle is opened 35 percent or less
Reverse Lockout
A reverse lockout system, consisting of a reverse lockout solenoid, which operates a reverse lockout mechanism, is utilized to prevent shifting into REVERSE gear when the vehicle is moving forward at a speed of 5 km/h (3 mph) or more.
Vehicle Speed Sensor
The vehicle speed sensor (VSS) is a pulse type input that informs the PCM how fast the vehicle is traveling. The VSS system uses an inductive sensor, mounted in the tail housing of the transmission, and a toothed reluctor wheel on the tail shaft. The teeth of the reluctor wheel alternately interfere with the magnetic field of the sensor, creating an induced voltage pulse as the reluctor rotates.
Reverse Inhibit Description and Operation
The reverse inhibit solenoid is a safety feature which prevents an inadvertent shift into reverse at speeds above 5 km/h (3 mph) . The system consist of the following components: [*]The powertrain control module (PCM) .[*]The reverse inhibit solenoid. With the ignition ON battery voltage is supplied directly to the reverse inhibit solenoid. At forward speeds above 5 km/h (3 mph) the PCM grounds the control circuit of the reverse inhibit solenoid. This energizes the solenoid and mechanically blocks the shift lever from going into the REVERSE position.
Skip Shift Description and Operation
The skip shift solenoid is a performance feature which forces the driver to shift from first gear to fourth gear during light acceleration and low engine load conditions. This feature is used to ensure good fuel economy and compliance with federal economy standards. The skip shift system consist of the following components: [*]The powertrain control module (PCM) .[*]The skip shift solenoid.[*]The skip shift lamp. With the ignition ON, battery voltage is supplied directly to the skip shift solenoid. The powertrain control module (PCM) controls the solenoid by grounding the control circuit. When the skip shift system is active the PCM also grounds the control circuit of the skip shift lamp. The lamp illuminates to inform the driver that the 1-4 skip shift is engaged. The PCM determines when the skip shift system is active when the following parameters are met:[*]The vehicle speed is between 24 - 31 km/h (15 - 19 mph) .[*]The engine coolant temperature (ECT) is greater than 77°C (171°F) .[*]The BARO is greater than 76 kPa.[*]The accelerator pedal position (APP) is less than 26 percent. When the conditions are met the powertrain control module (PCM) grounds the skip shift solenoid control circuit. This energizes the skip shift solenoid and mechanically blocks the gear shift lever from going in
Manual transmissions are identified by the number of forward gears and the measured distance between the centerline of theoutput shaftand the counter gear. The 6-speed, 85 mm manual transmission, used in the Camaro/Firebird, incorporates the following features:[*]An aluminum case[*]Fully synchronized gears with an enhanced synchronizer cone arrangement:[*]Triple-cone: FIRST, SECOND[*]Double-cone: THIRD, FOURTH, FIFTH, SIXTH[*]Single-cone: REVERSE[*]An internal shift rail mechanism[*]Tapered roller bearing supporting the mainshaft and countershaft[*]Caged roller bearings under ail speed gears[*]Solenoid inhibit of SECOND and THIRD gears[*]Solenoid inhibit of REVERSE gear during predefined forward motion
Gear Select - Skip Shift (CAGS)
To ensure good fuel economy and compliance with federal economy standards, SECOND and THIRD gear are inhibited when shifting out of FIRST gear, under the following conditions: [*]Coolant temperature is above 50°C (122°F)[*]Vehicle speed is 20 - 29 km/h (12 - 19 mph)[*]Throttle is opened 35 percent or less
Reverse Lockout
A reverse lockout system, consisting of a reverse lockout solenoid, which operates a reverse lockout mechanism, is utilized to prevent shifting into REVERSE gear when the vehicle is moving forward at a speed of 5 km/h (3 mph) or more.
Vehicle Speed Sensor
The vehicle speed sensor (VSS) is a pulse type input that informs the PCM how fast the vehicle is traveling. The VSS system uses an inductive sensor, mounted in the tail housing of the transmission, and a toothed reluctor wheel on the tail shaft. The teeth of the reluctor wheel alternately interfere with the magnetic field of the sensor, creating an induced voltage pulse as the reluctor rotates.
Reverse Inhibit Description and Operation
The reverse inhibit solenoid is a safety feature which prevents an inadvertent shift into reverse at speeds above 5 km/h (3 mph) . The system consist of the following components: [*]The powertrain control module (PCM) .[*]The reverse inhibit solenoid. With the ignition ON battery voltage is supplied directly to the reverse inhibit solenoid. At forward speeds above 5 km/h (3 mph) the PCM grounds the control circuit of the reverse inhibit solenoid. This energizes the solenoid and mechanically blocks the shift lever from going into the REVERSE position.
Skip Shift Description and Operation
The skip shift solenoid is a performance feature which forces the driver to shift from first gear to fourth gear during light acceleration and low engine load conditions. This feature is used to ensure good fuel economy and compliance with federal economy standards. The skip shift system consist of the following components: [*]The powertrain control module (PCM) .[*]The skip shift solenoid.[*]The skip shift lamp. With the ignition ON, battery voltage is supplied directly to the skip shift solenoid. The powertrain control module (PCM) controls the solenoid by grounding the control circuit. When the skip shift system is active the PCM also grounds the control circuit of the skip shift lamp. The lamp illuminates to inform the driver that the 1-4 skip shift is engaged. The PCM determines when the skip shift system is active when the following parameters are met:[*]The vehicle speed is between 24 - 31 km/h (15 - 19 mph) .[*]The engine coolant temperature (ECT) is greater than 77°C (171°F) .[*]The BARO is greater than 76 kPa.[*]The accelerator pedal position (APP) is less than 26 percent. When the conditions are met the powertrain control module (PCM) grounds the skip shift solenoid control circuit. This energizes the skip shift solenoid and mechanically blocks the gear shift lever from going in
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