Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester or the OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (See FREEZE FRAME DATA ).

1. INSPECT SPEEDOMETER (METER OPERATION) 
   1. Drive the vehicle and check if operation of the speedometer in the combination meter is normal.

      HINT:

      The vehicle speed sensor is operating normally if the speedometer display is normal.

   NG: CHECK SPEEDOMETER CIRCUIT 

   OK: Go to next step 

2. INSPECT ECM 
   1. Shift the lever to the neutral position.
   2. Jack up the vehicle.
   3. Turn the engine switch on (IG).
      Fig 1: Identifying ECM Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Measure the voltage according to the value (s) in the table below as the wheel is turned slowly.

      Standard 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      A5-22 (SPD) - E4-7 (E1)	Generated intermittently

      Fig 2: Voltage Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM