Inspection Procedure

1. Drive the vehicle and check if the function of the speedometer in the combination meter is normal.

   OK: Actual vehicle speed and the speed indicated on the speedometer are the same. 

   HINT:

   • The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.
   • The meter CPU receives vehicle speed signals from the skid control ECU via the CAN communication lines. The vehicle speed sensor detects the voltage that varies according to the vehicle speed. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on the pulses of the voltage.

OK: Go to step  3

NG: Go to Next Step 

1. Delete the DTCs (See DTC CHECK / CLEAR  ).
2. Check for CAN communication system DTCs.

   HINT:

   If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first (See DIAGNOSTIC TROUBLE CODE CHART ).

   OK: No DTC is output. 

NG: GO TO   2 CAN COMMUNICATION SYSTEM 

OK: GO TO   2 COMBINATION METER SYSTEM 

1. Disconnect the E59 ECU connector.
   Fig 1: Disconnecting E20 Combination Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E20 meter connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   E59-9 (SPD) - E20-12 (+S) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   E59-9 (SPD) - Body ground	Always	10 kΩ or higher

   HINT:

   If the result of the inspection for a short circuit is not as specified, there may be a short in the ECU.

Fig 2: Identifying Main Body ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS, CONNECTOR OR EACH ECU 

OK: Go to Next Step 

1. Check the input signal waveform.
   1. Reconnect the connectors.
   2. Remove the combination meter assembly with the connector(s) still connected.
   3. Connect an oscilloscope to terminal E59-9 (SPD) and body ground.
   4. Turn the engine switch on (IG).
   5. Turn the wheel slowly.
      Fig 3: Identifying Main Body ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   6. Check the signal waveform according to the condition(s) in the table below.
      SIGNAL WAVEFORM REFERENCE
      
      

      Item	Condition
      Tool setting	5V/DIV., 10 ms./DIV.
      Vehicle condition	Driving at approx. 20 km/h (12 mph)

      OK: The waveform is displayed as shown in the illustration. 

      HINT:

      As the vehicle speed increases, the cycle of the signal waveform narrows.

      Fig 4: Waveform Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE COMBINATION METER 

OK: REPLACE MAIN BODY ECU