Circuit/System Verification

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle ON, observe the scan tool Internal Mode Switch A/B/C/P parameter while moving the gear shift lever from Park, through all gear selector positions, and back to Park. The parameter should match each gear range that is selected. Refer to Transmission Internal Mode Switch Logic .
Verify all the Internal Mode Switch Status parameters display Valid while moving the gear shift lever from Park, through all gear selector positions, and back to Park.
- If any of the parameters display Invalid
  Refer to Circuit/System Testing.
- Go to next step: If all the parameters display valid
Verify all the Internal Mode Switch parameters display 1.62 V - 2.49 V when High and 0.66 V - 1.02 V when Low.
- If any of the parameters display outside of the specified range
  Refer to Circuit/System Testing.
- Go to next step: If all the parameters display within the specified range
Perform the Range Selector Lever Cable Adjustment procedure to verify proper adjustment.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify DTC P1824, P182A-P182F, P1838-P1841, P18B5-P18BA, P18BC, P18BF, P18C0, P18C2, or P18C3 is not set.
- If any of the DTCs are set
  Refer to Circuit/System Testing.
- Go to next step: If none of the DTCs are set
All OK.