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Pinpoint Test C: THE TRANSMISSION MANUAL SHIFT (+/-) IS INOPERATIVE

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK CIRCUITS 8-TA67 (WH/VT) AND 8-TA68 (WH/BK) INPUT TO THE PCM 
    • Disconnect: PCM C175a.
    • Measure the resistance between PCM C175a pin 49, circuit 8-TA67 (WH/VT), harness side and ground; and between PCM C175a pin 50, circuit 8-TA68 (WH/BK), harness side and ground, while activating the shifter to the manual up and down position.
      Fig 1: Measuring Resistance Between PCM C175a Pin 49, Circuit 8-TA67 And Ground; And Between PCM C175a Pin 50, Circuit 8-TA68 And Ground
      G03997806Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  C4.
    • No  : GO to  C2.
  2. C2 CHECK TRANSMISSION SHIFT SELECTOR CIRCUITS 31-TA67 (BK/WH) AND 31-TA68 (BK/RD) FOR OPEN 
    • Disconnect: Transmission Shift Selector 307.
    • Measure the resistance between transmission shift selector C307 pin 9, circuit 31-TA67 (BK/WH), harness side and ground; and between shifter C307 pin 4, circuit 31-TA68 (BK/RD), harness side and ground.
      Fig 2: Measuring Resistance Between Transmission Shift Selector C307 Pin 9, Circuit 31-TA67 And Ground; And Between Shifter C307 Pin 4, Circuit 31-TA68 And Ground
      G03997807Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  C3.
    • No  : REPAIR the circuits. TEST the system for normal operation.
  3. C3 CHECK CIRCUITS 8-TA67 (WH/VT) AND 8-TA68 (WH/BK) FOR OPEN 
    • Measure the resistance between shifter C307 pin 10, circuit 8-TA67 (WH/VT), harness side and PCM C175a pin 49, circuit 8-TA67 (WH/VT) harness side; and C307 pin 5, circuit 8-TA68 (WH/BK), harness side, and PCM C175a pin 50, circuit 8-TA68 (WH/BK), harness side.
      Fig 3: Measuring Resistance Between Shifter C307 Pin 10, Circuit 8-TA67 And PCM C175a Pin 49, Circuit 8-TA67; And C307 Pin 5, Circuit 8-TA68 And PCM C175a Pin 50, Circuit 8-TA68
      G03997808Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : INSTALL a new shifter harness. TEST the system for normal operation.
    • No  : REPAIR the circuits. TEST the system for normal operation.
  4. C4 CHECK CIRCUITS 8-TA67 (WH/VT) AND 8-TA68 (WH/BK) FOR SHORT TO GROUND 
    • Disconnect: Shifter C307.
    • Measure the resistance between PCM C175a pin 49, circuit 8-TA67 (WH/VT), harness side and ground; and between PCM C175a pin 50, circuit 8-TA68 (WH/BK), harness side and ground.
      Fig 4: Measuring Resistance Between PCM C175a Pin 49, Circuit 8-TA67 And Ground; And Between PCM C175a Pin 50, Circuit 8-TA68 And Ground
      G03997806Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to  C5.
    • No  : REPAIR the circuit. TEST system for normal operation.
  5. C5 CHECK THE TRANSMISSION SHIFT SELECTOR SWITCHES 
    • Connect: Transmission Shift Selector C307.
    • Measure the resistance between PCM C175a pin 49, circuit 8-TA67 (WH/VT), harness side and ground; and between PCM C175a pin 50, circuit 8-TA68 (WH/BK), harness side and ground while activating the manual up and down position.
      Fig 5: Measuring Resistance Between PCM C175a Pin 49, Circuit 8-TA67 And Ground; And Between PCM C175a Pin 50, Circuit 8-TA68 And Ground
      G03997806Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms with the switch on and greater than 10,000 ohms with the switch off? 
    • Yes  : INSTALL a new PCM.
    • No  : INSTALL a new harness. TEST the system for normal operation.
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