Electrical Function Check

Perform this procedure first in order to ensure the electronic transmission components are functioning properly. If these components are not checked, a simple electrical condition could be misdiagnosed.

1. Connect the scan tool.
2. Ensure the gear selector is in PARK and set the parking brake.
3. Start the engine.
   NOTE: Note that the engine may go in to AutoStop Mode depending on which gear is selected and many other variables. For more information on AutoStop Mode refer to Hybrid Modes of Operation Description .
4. Verify that the following scan tool data can be obtained and is functioning properly.

   Refer to Control Module References for typical data values. Data that is questionable may indicate a concern.

   • Engine Torque
   • Drvr Axle Torque Request
   • Calc. Throttle Position
   • Engine Speed
   • Calc. Trans Input Speed
   • Transmission OSS
   • ISS/OSS Supply Voltage
   • Replicated OSS CKT Status
   • Vehicle Speed
   • Output Shaft Direction
   • Variable Low 1-2R Clutch Slip
   • Variable High 2-3-4 Clutch Slip
   • 4th Clutch Slip
   • 1-3R Clutch Slip
   • Variable Low 1-2R Clutch Status
   • Variable High 2-3-4 Clutch Status
   • 4th Clutch Status
   • 1-3R Clutch Status
   • IAT
   • Brake Switch
   • Shift Solenoid 1
   • Shift Solenoid 2
   • Commanded Gear
   • Gear Ratio
   • Driver Shift Control
   • Driver Shift Request
   • IMS A/B/C/P
   • IMS
   • TFP Switch 1
   • TFP Switch 3
   • TFP Switch 4
   • TFP Switch 5
   • ECT
   • Trans. Fluid Temp.
   • TCM Power Up Temperature
   • TCM Temperature
   • PC Sol. 2 Pressure Cmd.
   • PC Sol. 3 Pressure Cmd.
   • PC Sol. 4 Pressure Cmd.
   • PC Sol. 5 Pressure Cmd.
   • Line PC Sol. Pressure Cmd.
   • Engine Run Time
   • EC Ignition Relay Feedback Signal
   • Ignition Voltage
   • Transfer Case Ratio
5. Check the garage shifts.
   1. Apply the brake pedal and ensure the parking brake is set.
      NOTE: If the vehicle was in the AutoStop Mode the engine will start and run when the gear selector is placed in Reverse and M (Manual). If the gear selector is moved very quickly through these ranges and is in the AutoStop Mode the engine will not restart.
   2. Move the gear selector through the following ranges:
      1. PARK to REVERSE
      2. REVERSE to NEUTRAL
      3. NEUTRAL to DRIVE
   3. Pause 2 to 3 seconds in each gear position.
   4. Verify the gear engagements are immediate and not harsh.
      NOTE: These shifts can not be felt when trans is functioning properly.
NOTE: Harsh engagement may be caused by any of the following conditions:
• High engine idle speed-Compare engine idle speed to desired idle speed.
• Commanded low pressure control (PC) solenoid current-Investigate PC Sol. Pressure Cmd. kPa (psi) for all solenoids. High pressure will cause harsh shifts.
• A default condition caused by certain DTCs that result in maximum line pressure to prevent clutch slippage.
NOTE: Soft or delayed engagement may be caused by any of the following conditions:
• Low idle speed-Compare engine idle speed to desired idle speed
• Low auxiliary pump pressure in autostop only
• Low fluid level
• Commanded high PC solenoid current-Investigate PC Sol. Pressure Cmd. kPa (psi) for all solenoids. Low pressure will cause soft or delayed shifts
• Cold transmission fluid temperature (TFT)-Use the scan tool to determine TFT
• Selector linkage-Inspect and adjust as necessary
6. Monitor transmission range on the scan tool, trans data list.
   1. Apply the brake pedal and ensure the parking brake is set.
   2. Move the gear selector through all ranges.
   3. Pause 2 to 3 seconds in each range.
   4. Return gear selector to PARK.
   5. Verify that all selector positions match the scan tool display.
7. Check throttle position input.
   1. Apply the brake pedal and ensure the parking brake is set.
   2. Ensure the gear selector is in PARK.
   3. Monitor the scan tool Calc. Throttle Position while increasing and decreasing engine speed with the throttle pedal. The scan tool Calc. Throttle Position percentage should increase and decrease with engine speed.

If any of the above checks do not perform properly, record the result for reference after completion of the road test.