Gear Select (Skip Shift); Reverse Lockout; Skip Shift Description And Operation - Chevrolet Corvette 2005 Owner's Manual

2005 Chevrolet Corvette Restoration Kit
sealed universal-style joints, enabling the range of motion necessary in order to shift gears. The shift rod
(2) is connected to the transmission shift control (1) which is a lubricated and sealed unit, mounted to the
driveline support assembly. The mounting system utilized for the shift control (1) incorporates rubber
insulators. The cockpit of the vehicle is isolated from the driveline through the use of a shift control
closeout boot which seals off the shift control and the driveline tunnel shift control opening.
Gear Select (Skip Shift)
To ensure good fuel economy and compliance with federal fuel economy standards, SECOND and
THIRD gears are inhibited when shifting out of FIRST gear under the following conditions:
• Coolant temperature is above 50°C (122°F).
• Vehicle speed is between 20 and 29 km/h (12 and 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.
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 7rC (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 into
the second or third gear positions. When the drivers pulls back on the shift lever with the system enabled
the transmission will go into fourth gear.
When the conditions for skip shift engagement are no longer met the powertrain control module (PCM)
disables the skip shift solenoid, allowing the driver to use second and third gears.
Once the skip shift solenoid is enabled the system will not be re-enabled until the vehicle speed returns to
o
km/h (0 mph) and the conditions for enabling skip shift solenoid are met.
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