Checking the control module

Fig 1: Identifying Ignition ON

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Fig 2: Identifying Connectors

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Fig 3: Identifying Connecting Control Module

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• Ignition off
• The breakout box connected
• Connect the control module.
• Transmission connector disconnected
• Gear selector in position P.

  Check the transmission control module (TCM) by measuring the resistance between terminals #B8 (#A68) and #A53 (#A53) on the breakout box. The resistance must be approximately 9 kΩ.

  NOTE:

  When removing the transmission connector, the control module may store diagnostic trouble codes (DTCs) for the gear-shift position sensor, the shift solenoids, the temperature sensor etc.

  Try a new control module if the resistance is infinite.

  Other information: 

  • To disconnect the transmission connectors, see Connectors, transmission, disconnecting / connecting
  • To replace the control module, see Transmission control module (TCM), replacing
  • For information about signals, see Signal description. Transmission control module (TCM) .
  Fig 4: Identifying Breakout Box

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  Fig 5: Identifying Ohms Display

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Was the resistance OK? 

• YES 

  FAULT NOT FOUND:  Troubleshooting has been completed.

• NO 

  Refer to Verification