Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Drive Test - Upshift and Downshift Control
The output state control values for GEAR_OSC to control the transaxle gear changes are as follows:
- 0 - PCM in normal shift control and output state control 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
- 4 - Commands PCM to shift to 4th 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. Output state control will command the PCM to upshift or downshift depending on the output state control gear value the technician selects. The transmission will remain in the output state control gear selected until another output state control gear value is sent or until output state control is cancelled and/or the vehicle conditions for using output state control 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
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.