Using The Pressure Test Assistance Mode (BJA18-1)

USING THE PRESSURE TEST ASSISTANCE MODE

TECHNICAL SERVICE BULLETIN

INTRODUCTION

When automatic transmission troubleshooting requires you to drive the vehicle on a lift, the transmission may not automatically shift past 2nd gear. In order to do that, you need to shift to Neutral, then back to Drive, which could interfere with Data List readings.

The Pressure Test Assistance Mode in the i-HDS lets you shift the transmission through all forward gears while in Drive using the accelerator pedal and provides uninterrupted data from all sensors and switches.

This job aid shows you how to use the Pressure Test Assistance Mode.

PROCEDURE

1. Make sure the drive wheels are off the ground and can freely turn. If needed, release the parking brake and turn off the VSA system (if applicable).
2. Connect the i-HDS to the DLC.
3. Turn the ignition to ON.
4. Make sure the engine coolant temperature, transmission fluid temperature, etc. are at the right testing conditions for your troubleshooting.
5. Start the engine.
6. Select AT  from the System Selection Menu  .
7. Select Function Test  from the Test Mode Menu. 
8. Select Pressure Test Assistance Mode  from the Function Test  Menu.
9. Select YES  .
10. Select the green check mark to start the Pressure Test Assistance Mode.
11. The vehicle is now in the Pressure Test Assistance Mode. You can now run tests on the vehicle and automatic transmission using accelerator pedal. Selecting the green check mark will return you to the previous menu, but will not  disable this mode.
12. When you have completed your test or collected enough data, you can stop this mode by turning the ignition to OFF, then to ON. This will return the vehicle system to normal.