Drive Test - Upshift and Downshift Control

NOTE: Once OSC has successfully commanded the transmission to shift to the desired OSC gear, the transmission will remain in that gear until OSC commands a different gear or the vehicle conditions are no longer correct.

The OSC values for GEAR_OSC to control the transaxle gear changes are as follows:

0 - PCM in normal shift control and OSC is cancelled
1 - Commands PCM to shift to 1st gear - no engine braking
2 - Commands PCM to shift to 2nd gear - with engine braking
3 - Commands PCM to shift to 3rd gear - with engine braking
5 - Commands PCM to shift to 5th gear - with engine braking
6 - Commands PCM to shift to 6th gear - with engine braking

Controlling the gear changes will assist the technician in testing the various clutches and bands and whether the transmission is slipping in any particular gear. OSC will command the PCM to upshift or downshift depending on the OSC gear value the technician selects. The transmission will remain in the OSC gear selected until another OSC gear value is sent or until OSC is cancelled and/or the vehicle conditions for using OSC are no longer met.

Vehicle requirements when using GEAR_OSC - Controlling Gear Changes

When SENDING a GEAR_OSC value the engine must be running with the selector lever in the DRIVE position, and the vehicle speed must be greater than 5 km/h (3 mph).

Additional vehicle conditions required for upshifts:

Vehicle speed must be greater then 32 km/h (20 mph) when commanding an upshift to 5th or 6th gear

Additional vehicle conditions required for downshifts:

Vehicle speed must be less then 32 km/h (20 mph) when commanding a downshift to 1st gear
Vehicle speed must be less then 64 km/h (40 mph) when commanding a downshift to 2nd gear
Vehicle speed must be less then 97 km/h (60 mph) when commanding a downshift to 3rd gear
Vehicle speed must be less then 129 km/h (80 mph) when commanding a downshift to 4th gear
Vehicle speed must be less then 161 km/h (100 mph) when commanding a downshift to 5th gear