Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Refer to Road Test Warning .

Ignition ON.
Verify DTC P0651, P18C4, P18C5, P18C6, or P18C7 is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If none of the DTCs are set
Test drive the vehicle shifting the transmission through all gear ranges.
Verify the transmission shifts smoothly through all gears, the clutch engagement is firm, and engine speed remains constant during steady state driving.
Verify the scan tool Current Gear parameter matches the Gear Shift Position parameter when the clutch is released for each forward gear.
- If the transmission does not shift smoothly
  Refer to Symptoms - Manual Transmission (MG9) Symptoms - Manual Transmission (M3L) .
- If the engine speed flares during steady state driving and the Current Gear and Gear Shift Position parameters don't match
  Refer to Symptoms - Clutch .
- If the Current Gear and Gear Shift Position parameters don't match
  Refer to Circuit/System Testing.
- If the transmission shifts smoothly, engine speed remains constant during steady state driving, and Current Gear and Gear Shift Position parameters match
Ignition ON.
Verify the scan tool Gear Shift Position Sensor parameter displays the following duty cycle as the gear shift lever is moved to each gear position:
- 10-31% duty cycle for Gear 1 and Gear 2
- 28-53% duty cycle for Gear 3, Neutral 3-4 Gate, and Gear 4
- 44-73% duty cycle for Gear 5 and Gear 6
- 60-90% duty cycle for Reverse Gear
- If the Gear Shift Position Sensor parameter is not within the specified range
  Refer to Circuit/System Testing.
- If the Gear Shift Position Sensor parameter is within the specified range
Verify the scan tool Gate Select Position Sensor parameter displays the following duty cycle as the gear shift lever is moved to each gear position:
- 73-87% duty cycle for Gear 1, Gear 3, Gear 5, and Reverse Gear
- 48-60% duty cycle for Neutral 3-4 Gate
- 25-34% duty cycle for Gear 2, Gear 4, and Gear 6
- If the Gate Select Position Sensor parameter is not within the specified range
  Refer to Circuit/System Testing.
- If the Gate Select Position Sensor parameter is within the specified range
Operate the vehicle within the conditions for running the DTC to verify the DTC does not set. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
- If the DTC sets
  Refer to Circuit/System Testing.
- If the DTC does not set
All OK.