Checking the wiring and component

Fig 1: Identifying Ignition OFF

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Fig 2: Identifying Connectors

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Fig 3: Identifying Control Module Disconnected

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• Ignition off
• Disconnect the control module.
• Connect the breakout box to the control module connector (transmission side)
• Disconnect the transmission connector
• Connect adapter 9511505 and breakout box 9511428 to the transmission connector (control module side).

  Check the control module and transmission connectors. Check for contact resistance and oxidation.

  Check the cable between control module terminal #A65 (#B5) and transmission connector terminal #U (#A18) (control module side). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

  If a fault was not detected in the wiring or terminals replace the control module.

  Other information: 

  • To connect the breakout box to the control module, see Connecting the breakout box
  • To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions
  • For information about signals, see Signal specification
  • See Checking wiring and terminals. Permanent fault
  Fig 4: Identifying Breakout Box

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  Fig 5: Identifying Ohms Display

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Was a fault detected in the cables or terminals? 

• YES 

  Refer to Checking diagnostic trouble codes (DTCs) 

• NO 

  Refer to Checking the wiring and component 

Fig 1: Identifying Ignition OFF

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• Ignition off
• Open the transmission control system
• Connect adapter 9511505 and breakout box 9511428 to the transmission connector (transmission side).

  Check that the pins in the pressure switch module connector are not loose or bent. Check that the connector is correctly connected.

  Check the transmission and pressure switch module connectors. Check for contact resistance and oxidation.

  Check the cable between control module terminal #U (terminal #A18) and pressure switch module connector terminal #B. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

  Check the transmission oil filter. Check for abnormal  amounts of particles in the oil.

  Replace the oil filter if necessary.

  Replace the pressure switch module if no abnormal amount of particles were found in the oil filter or there was no fault in the wiring.

  Other information: 

  • To open the transmission control system, see Wiring harness / oil temperature sensor, replacing
  • To connect the breakout box to the control module, see Connecting the breakout box
  • To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions
  • To replace the cable harness, see Wiring harness / oil temperature sensor, replacing
  • To replace the oil filter:
    • For AW50-42 1999-, see Transmission fluid, replacing
    • For 4T65 1999-, see Transmission oil / oil filter, replacing .
    • For AW55-50 and AW50AWD (AMB) 2000-, see Transmission fluid, replacing .
  • To replace the pressure switch module, see Replacing pressure sensor
  • For information about signals, see Signal specification
  • See Checking wiring and terminals. Permanent fault
  Fig 2: Identifying Pressure Switch Module Connector Terminal #B

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  Fig 3: Identifying Ohms Display

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• Continue 

  Refer to Resetting the adaptation 

Fig 1: Identifying Ignition OFF

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• Ignition off
• Open the transmission control system
• Connect adapter 9511505 and breakout box 9511428 to the transmission connector (transmission side).

  Check the cable between transmission connector terminal #T (#A17) and solenoid SL terminal #A. Check the cable between transmission connector terminal #E (#A5) and solenoid SL terminal #B. Check these cables for an open-circuit.

  HINT: Check solenoid SL by measuring the resistance between solenoid SL terminals #A and #B. When the transmission is cold (approximately 20°C), the resistance must be 10-11 Ω. 

  Remedy as necessary.

  Other information: 

  • Opening the transmission control system: For removal, see Removing gearbox side cover To install, see Installing the gearbox side cover .
  • To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions
  • To replace solenoid SL, see Solenoid lock-up function, replacing
  • To replace the cable harness, see Wiring harness / oil temperature sensor, replacing
  • For information about signals, see Signal specification
  • See Checking wiring and terminals. Permanent fault
  Fig 2: Identifying Breakout Box

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  Fig 3: Identifying Ohms Display

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  Fig 4: Identifying Lock-Up Solenoid, SL

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• Continue 

  Refer to Resetting the adaptation