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Pinpoint Test C: Torque Converter Clutch (TCC) Solenoid

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to Figure preceding these pinpoint tests.
  1. C1 ELECTRONIC DIAGNOSTICS 
    • Key in OFF position.
    • Make sure the transaxle vehicle harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
    • Connect the scan tool.
    • Key in ON position.
    • Carry out KOEO Test until continuous DTCs have been
    • displayed.
    • Select Output State Test Mode (OTM).
    • Select the mode ALL ON. Push START to turn outputs on.
    • Push STOP to turn outputs off.
    • Does vehicle enter OTM? 

    Yes:  REMAIN in OTM. GO to  C2.

    No:  PRESS START. If vehicle does not enter OTM, REFER to INTRODUCTION - GASOLINE .

  2. C2 CHECK ELECTRICAL SIGNAL OPERATION 
    CAUTION: Do not pry on the connector. This will damage the connector and can result in a transaxle concern. Press button and pull up on the transaxle vehicle harness connector.
    • Key in OFF position.
    • Disconnect: Transaxle Connector.
    • Use a mirror to inspect both ends of the connector for damaged or pushed-out pins, corrosion, loose wires and missing or damaged seals.
    • Key in ON position.
    • Measure the voltage between pin 1 and pin 7 of the transaxle vehicle harness connector.
      Fig 1: Checking Electrical Signal Operation
      G04619792Courtesy of FORD MOTOR CO.
    • While observing the VOM, press STAR and STOP to cycle solenoid output on and off.
    • Does the suspected solenoid output voltage change at least 0.5 volt? 

    Yes:  GO to  C5.

    No:  GO to  C3.

  3. C3 CHECK CONTINUITY OF SOLENOID SIGNAL AND VPWR HARNESS CIRCUITS 
    • Key in OFF position.
    • Disconnect: PCM.
    • Disconnect: Transaxle Connector.
    • Measure the resistance between the PCM pin T46 and the transaxle harness connector pin 7.
      Fig 2: Checking Continuity Of Solenoid Signal & VPWR Harness Circuits (1 Of 2)
      G04619793Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM pin C35 and C36 and the transaxle harness connector pin 1.
      Fig 3: Checking Continuity Of Solenoid Signal & VPWR Harness Circuits (2 Of 2)
      G04619794Courtesy of FORD MOTOR CO.
    • Is each resistance less than 5 ohms? 

    Yes:  GO to  C4.

    No:  REPAIR open circuit(s). RECONNECT all components. RERUN Quick Test.

  4. C4 CHECK SOLENOID/HARNESS FOR SHORTS TO POWER AND GROUND 
    • Disconnect: PCM.
    • Disconnect: Transaxle Connector.
    • Measure the resistance between the PCM pin T46 and the PCM pins C35 and C36.
      Fig 4: Checking Solenoid/Harness For Shorts To Power & Ground (1 Of 3)
      G04619795Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM pin T46 and the PCM pins C47, C48 and C49 and chassis ground.
      Fig 5: Checking Solenoid/Harness For Shorts To Power & Ground (2 Of 3)
      G04619796Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM pin T46 and the PCM pin T4 and chassis ground.
      Fig 6: Checking Solenoid/Harness For Shorts To Power & Ground (3 Of 3)
      G04619797Courtesy of FORD MOTOR CO.
    • Is each resistance less than 10,000 ohms? 

    Yes:  GO to  C5.

    No:  REPAIR short circuit(s). RECONNECT all components. RERUN Quick Test.

  5. C5 TRANSAXLE FUNCTIONAL TEST 
    CAUTION: Do not pry on the connector. This will damage the connector and can result in a transaxle concern. Press button and pull up on the transaxle vehicle harness connector.
    NOTE: LED will turn GREEN when solenoid activates and turns OFF when deactivated. LED will turn RED if an activated solenoid/harness is shorted to B+. LED will remain OFF if an activated solenoid/harness is shorted to ground or no continuity (open circuit).
    • Disconnect: Transaxle Connector.
    • Connect: Transmission Tester.
    • Carry out the TCC Solenoid Function Test as outlined in the Transmission Tester Manual.
    • Does TCC (LED green) activate when tester switch is pressed? 

    Yes:  GO to  C6.

    No:  GO to  C7.

  6. C6 TRANSAXLE DRIVE CYCLE TEST 
    • Connect: PCM.
    • Carry out Dynamic Testing as outlined in the Transmission Tester Manual.
    • Does TCC activate (LED green) and engine rpm drop? 

    Yes:  INSTALL a new PCM. RECONNECT all components. RERUN On-Board Diagnostic tests. If symptoms are still present, REFER to DIAGNOSIS BY SYMPTOM .

    No:  GO to  C7.

  7. C7 CHECK RESISTANCE OF SOLENOID/HARNESS 
    • Set Bench/Drive switch to BENCH mode.
    • Rotate gear select switch to OHMS CHECK position.
    • Measure the resistance between TCC jack and VPWR jack on the Transmission Tester.
      Fig 7: Checking Resistance Of Solenoid/Harness
      G04619798Courtesy of FORD MOTOR CO.
    • Is the resistance between 12.5 and 19.0 ohms? 

    Yes:  GO to  C8.

    No:  INSTALL a new solenoid body assembly.

  8. C8 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND 
    • Measure the resistance between BAT-jack (engine ground) and TCC jack, and VPWR jack on Transmission Tester.
      Fig 8: Checking Solenoid/Harness For Short To Ground
      G04619799Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes:  INSTALL a new solenoid body assembly.

    No:  REFER to DIAGNOSIS BY SYMPTOM  to diagnose torque converter clutch.

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