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Inspection Procedure

  1. CHECK OPERATION (OVERDRIVE) 
    1. Drive the vehicle after the engine warms up.
    2. Check that overdrive ON <-> OFF occurs by an operation of the O/D switch ON <-> OFF.
    1. NO: GO TO ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION [ECT] 
    2. YES: GO TO NEXT STEP. 
  2. INSPECT TERMINAL VOLTAGE (OD) 
    1. Remove the cruise control ECU assy with the connector still connected.
    2. Turn the ignition switch to ON.
    3. Disconnect the cruise control ECU assy connector.
    4. Measure voltage between terminal 14 (OD) of harness side connector of cruise control ECU assy and body ground.
      Fig 1: Disconnecting Cruise Control ECU Assy Connector & Identifying Terminal OD (+)
      G02916116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      Voltage: 10 - 14 V 

    1. NG: Go to step   5 
    2. OK: GO TO NEXT STEP. 
  3. INSPECT TERMINAL VOLTAGE (ECT) 
    1. Connect the cruise control ECU assy connector.
    2. Perform the test drive after engine warms up.
    3. Check voltage between terminal 6 (ECT) of cruise control ECU assy connector and body ground when O/D switch is ON and OFF.
      Fig 2: Identifying ECT (+) Connector
      G02916117Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      2ZZ-GE, 1ZZ-FE 4WD: 

      O/D SWITCH POSITION VOLTAGE 2Z2-GE & 1ZZ-FE AWD

      O/D Switch Position Voltage
      ON 8 - 16 V
      OFF Below 0.5 V

      1ZZ-FE FF: 

      O/D SWITCH POSITION VOLTAGE 1ZZ-FE FWD

      O/D Switch Position Voltage
      ON Below 0.5 V
      OFF 8 - 16 V
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. NG: GO TO NEXT STEP. 
  4. CHECK HARNESS AND CONNECTOR (BETWEEN CRUISE CONTROL ECU ASSY AND ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID) 
    1. Check for open and short circuit in harness and connector between cruise control ECU assy and electronically controlled transmission solenoid (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
  5. CHECK HARNESS AND CONNECTOR (BETWEEN CRUISE CONTROL ECU ASSY AND ECM) 
    1. Check for open and short circuit in harness and connector between cruise control ECU assy and ECM (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
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