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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 ((Transmission Control Module (TCM) - Electrical Diagnostics - As68RC Automatic Transmission)) >> DTC Troubleshooting >> P0973-Shift Solenoid A Control Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

When Monitored:

Set Condition:



  1. CHECK IF DTC 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  7.
  2. CHECK THE (T808) SHIFT (ON/OFF) SOLENOID 1 CONTROL CIRCUIT FOR AN OPEN 
    Fig 1: Checking Shift (On/Off) Solenoid 1 Control Circuit For An Open
    GC0111604Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the Transmission Solenoid Assembly C2 harness connectors.
    3. Disconnect the TCM C3 harness connector.
      NOTE:

      Check connectors - Clean/repair as necessary.

    4. Measure the resistance of the (T808) Shift (On/Off) Solenoid 1 Control circuit between the Transmission Solenoid Assembly C2 harness connector and the TCM C3 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  3.

      No 

      • Repair the (T808) Shift (On/Off) Solenoid 1 Control circuit for an open.
      • Refer to STANDARD PROCEDURE  and perform the AS68RC VERIFICATION TEST.
  3. CHECK THE (T808) SHIFT (ON/OFF) SOLENOID 1 CONTROL CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Checking Shift (On/Off) Solenoid 1 Control Circuit For A Short To Ground
    GC0111605Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (T808) Shift (On/Off) Solenoid 1 Control circuit.

      Is the resistance below 100k Ohms?

      Yes 

      • Repair the (T808) Shift (On/Off) Solenoid 1 Control circuit for a short to ground.
      • Refer to STANDARD PROCEDURE  and perform the AS68RC VERIFICATION TEST.

      No 

      • Go To  4.
  4. CHECK THE (T808) SHIFT (ON/OFF) SOLENOID 1 CONTROL CIRCUIT SHORT TO VOLTAGE 
    Fig 3: Checking Shift (On/Off) Solenoid 1 Control Circuit Short To Voltage
    GC0111606Courtesy of CHRYSLER GROUP, LLC
    1. Ignition on, engine not running.
    2. Measure the voltage of the (T808) Shift (On/Off) Solenoid 1 Control circuit.

      Is the voltage above 0.5 of a volt?

      Yes 

      • Repair the (T808) Shift (On/Off) Solenoid 1 Control circuit for a short to voltage.
      • Refer to STANDARD PROCEDURE  and perform the AS68RC VERIFICATION TEST.

      No 

      • Go To  5.
  5. CHECK THE (T808) SHIFT (ON/OFF) SOLENOID 1 CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    Fig 4: Checking Shift (On/Off) Solenoid 1 Control Circuit For A Short To Another Circuit
    GC0111607Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off to the lock position.
    2. Measure the resistance between the (T808) Shift (On/Off) Solenoid 1 Control circuit and all other circuits in the Transmission Solenoid Assembly C2 harness connector.

      Is the resistance below 100k Ohms between the (T808) Shift (On/Off) Solenoid 1 Control circuit and any other circuit in the Transmission Solenoid Assembly harness connector?

      Yes 

      • Repair the (T808) Shift (On/Off) Solenoid 1 Control circuit for a short to another circuit(s).
      • Refer to STANDARD PROCEDURE  and perform the AS68RC VERIFICATION TEST.

      No 

      • Go To  6.
  6. CHECK THE SHIFT (ON/OFF) SOLENOID 1 
    Fig 5: Checking Shift (On/Off) Solenoid 1 And Circuits
    GC0111608Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off to the lock position.
    2. Reconnect the Transmission Solenoid Assembly C2 Harness connector.
    3. Measure the resistance of the Shift (On/Off) Solenoid 1 between the (T808) Shift (On/Off) Solenoid 1 and ground at the TCM C3 harness connector.

      Is the resistance of the Shift (On/Off) Solenoid 1 13.0 Ohms (± 2.0 Ohms)?

      Yes 

      • 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.
      • Refer to STANDARD PROCEDURE  and perform the AS68RC VERIFICATION TEST.

      No 

      • Replace the Shift (On/Off) Solenoid 1 in accordance with the Service Information.
      • Refer to STANDARD PROCEDURE  and perform the AS68RC VERIFICATION TEST.
  7. CHECK WIRING AND CONNECTORS 
    1. The conditions necessary to set the 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. Check for any Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      • Repair as necessary.
      • Refer to STANDARD PROCEDURE  and perform the AS68RC VERIFICATION TEST.

      No 

      • Test Complete.
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