Inspection Procedure

HINT:

• Refer to inspection procedure for CAN communication system (See HOW TO PROCEED WITH TROUBLESHOOTING ).
• If the CAN communication malfunctions, the TCM cannot receive the current data from the ECM. In this case, the freeze frame data output from the TCM has not been updated, so the data will not be useful for the inspection. However, reading the Data List as the first step in troubleshooting is effective to find malfunctions.
• The malfunction area can be checked using the BUS CHECK function on the intelligent tester (See DIAGNOSIS SYSTEM ).

1. CHECK ECU TERMINAL VOLTAGE (+B AND E1 TERMINALS) 
   1. Disconnect the TCM connector.
   2. Turn the engine switch on (IG).
   3. Measure the voltage of the TCM connector.

      Standard voltage 

      ECU TERMINAL VOLTAGE (+B AND E1 TERMINALS) VOLTAGE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      B40-18 (+B) - B40-8 (E1)	9 to 14 V

   4. Turn the engine switch off.
   5. Measure the resistance of the TCM connector.

      Standard resistance 

      ECU TERMINAL VOLTAGE (+B AND E1 TERMINALS) RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      B40-8 (E1) - Body ground	Below 1 Ω

      Fig 1: TCM Connector Terminal Identification

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

2. CHECK HARNESS AND CONNECTOR (TCM - ECM) 
   1. Disconnect the B40 TCM connector.
   2. Disconnect the B12 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      B40-6 (CAN+) - B12-2 (CAN+)	Below 1 Ω
      B40-7 (CAN-) - B12-1 (CAN-)	Below 1 Ω
      B40-6 (CAN+) or B12-2 (CAN+) - Body ground	1 MΩ or more
      B40-7 (CAN-) or B12-1 (CAN-) - Body ground	1 MΩ or more

   Fig 2: Identifying ECM And TCM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

3. CHECK IF DTC OUTPUT RECURS 
   1. Connect the intelligent tester to the DLC3.
   2. Clear the DTC.
   3. Replace the TCM.

      HINT:

      Replace the TCM with the TCM of a normally functioning vehicle of the same model.

   4. Start the engine.
   5. Read the DTCs.

      Result 

      RESULT REFERENCE
      
      

      Display (DTC Output)	Proceed to
      P0100	A
      No DTC	B

   B: REPLACE TCM 

   A: REPLACE ECM