Inspection Procedure

HINT:

Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

1. CHECK OPERATION OF SPEEDOMETER 
   1. Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.

      HINT:

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

   NG: CHECK SPEEDOMETER CIRCUIT 

   OK: Go to Next Step 

2. INSPECT ECM (SPD VOLTAGE) 
   1. Shift the transmission gear selector lever to the neutral position.
   2. Jack up the vehicle.
   3. Turn the ignition switch ON.
   4. Check the voltage between the terminals of the E6 and E7 ECM connectors as the wheel is turned slowly.

      Standard 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      SPD (E7-8) - E1 (E6-1)	Voltage generated intermittently

      HINT:

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

   Fig 1: Inspecting ECM (SPD Voltage)
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM