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Pinpoint Test H: Overdrive Cancel Switch Not Working

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK INPUT TO PCM 
    • Key in OFF position.
    • Disconnect: PCM C175a.
    • Key in ON position.
    • Measure the voltage between PCM C175a pin 41, circuit 8-TA21 (WH/GN), harness side and ground.
      Fig 1: Measuring Voltage Between PCM C175A Pin 41, Circuit 8-TA21 (WH/GN), Harness Side And Ground
      G03201639Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      1. Yes  : REFER to INFORMATION, GAUGES & WARNING DEVICES .
      2. No  : GO to H2.
  2. H2 CHECK FOR VOLTAGE TO FUSE 205 (5A) 
    • Key in ON position.
    • Measure the voltage between primary junction box fuse 205 (5A) input pin and ground.
      Fig 2: Measuring Voltage Between Primary Junction Box Fuse 205 (5A) Input Pin And Ground
      G03201640Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      1. Yes  : GO to H3.
      2. No  : REPAIR the circuit. TEST the system for normal operation.
  3. H3 CHECK FOR VOLTAGE INPUT TO THE SHIFTER 
    • Key in OFF position.
    • Disconnect: Transmission Shift Selector C307.
    • Key in ON position.
    • Measure the voltage between transmission shift selector C307 pin 7, circuit 15-TA21 (GN/BK), harness side and ground.
      Fig 3: Measuring Voltage Between Transmission Shift Selector C307 Pin 7, Circuit 15-Ta21 (GN/BK), Harness Side And Ground
      G03201641Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      1. Yes  : GO to H4.
      2. No  : REPAIR circuit 15-DA5 (GN/OG) or 15-TA21 (GN/BK). TEST the system for normal operation.
  4. H4 CHECK CIRCUIT 8-TA21 (WH/GN) FOR SHORT TO GROUND 
    • Disconnect: PCM C175a.
    • Disconnect: Transmission Shift Selector C307.
    • Measure the resistance between transmission shift selector C307 pin 6, circuit 8-TA21 (WH/GN), harness side and ground.
      Fig 4: Measuring Resistance Between Transmission Shift Selector C307 Pin 6, Circuit 8-TA21 (WH/GN), Harness Side And Ground
      G03201642Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
      1. Yes  : GO to H5.
      2. No  : REPAIR the circuit. TEST the system for normal operation.
  5. H5 CHECK CIRCUIT 8-TA21 (WH/GN) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between PCM C175a pin 41, circuit 8-TA21 (WH/GN), harness side and transmission shift selector C307 pin 6, circuit 8-TA21 (WH/GN), harness side.
      Fig 5: Checking Circuit 8-TA21 (WH/GN) For Open
      G03201643Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      1. Yes  : INSTALL a new shifter harness. TEST the system for normal operation.
      2. No  : REPAIR the circuit. TEST the system for normal operation.
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