Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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. Move the transmission gear selector lever to the neutral position.
   2. Jack up the vehicle.
   3. Turn the ignition switch ON.
   4. Measure the voltage between the terminals of the E4 and E5 ECM connectors as the front wheel is turned slowly.

      Standard voltage 

      TESTER CONNECTION - SPECIFIED CONDITIONS
      
      

      Tester Connection	Specified Condition
      SPD (E4-8) - E1 (E5-3)	Voltage generated intermittently

      Fig 1: Measuring Voltage Between Terminals Of E4 And E5 ECM Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

      Fig 2: Identifying Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM