Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

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 display is normal.

   • NG : CHECK SPEEDOMETER CIRCUIT (See  LOCATION  ) 
   • OK : Go to next step 
2. INSPECT ECM (SPD VOLTAGE) 
   1. Shift the 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 E4 and E5 ECM connectors as the wheel is turned slowly.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      SPD (E5-17) - E1 (E4-7)	Voltage is generated intermittently

   Fig 1: Checking 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 on the left when the wheel is turned slowly.

   Fig 2: Turn Wheel Output Voltage Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
   • OK : REPLACE ECM (See  REPLACEMENT  )