Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK TO SEE IF DTC P0850 IS CURRENT
1. Using the scan tool, read TCM DTCs.
2. Record the Environmental Data and any DTCs.
3. Clear DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. Read TCM DTCs.
  Did the DTC reset?
  
  Yes
  - Go To 2
  No
  - Go To 5
CHECK FOR OTHER SENSOR DTCS
1. Using the scan tool, read TCM DTCs.
  Are there other sensor or sensor power supply DTCs set?
  
  Yes
  - Check the (F895) 5 Volt Supply C circuit for an open or short to ground. If no problem is found, and using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM in accordance with the Service Information.
  - Perform the C635 DDCT TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK (T406) PARK POSITION SIGNAL CIRCUIT FOR AN OPEN OR SHORT TO GROUND
1. Turn the ignition off to the lock position.
2. Disconnect the TCM C1 harness connector.
3. Disconnect the Park Position harness connector.
4. Check the (T406) Park Position Signal circuit for an open or short to ground.
  Was an open or short to ground found?
  
  Yes
  - Repair the (T406) Park Position signal circuit for an open or short to ground.
  - Perform the C635 DDCT TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK THE (T190) SENSOR GROUND CIRCUIT FOR AN OPEN
1. Disconnect the TCM C2 harness connector.
2. Measure the resistance of the (T190) Sensor ground circuit between the Park Position Sensor and the TCM C2 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (T190) Sensor ground circuit for an open.
  - Perform the C635 DDCT TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Park Position Sensor.
  - Perform the C635 DDCT VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
4. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the C635 DDCT TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test Complete.