Inspection Procedure

1. Delete the DTCs (See DTC CHECK / CLEAR  ).
2. After all DTCs are cleared, check if the trouble occurs again 320 seconds after the power switch is turned on (IG).
3. Check for DTC B2282 (Vehicle speed signal malfunction) and DTC B2283 (Vehicle speed sensor malfunction).

   Result 

   RESULT REFERENCE
   
   

   Display (DTC output)	Proceed to
   "DTC B2283" only	A
   "DTC B2283" and "DTC B2282"	B
   No DTC	C

   HINT:

   If DTC B2282 and DTC B2283 are output, perform troubleshooting for DTC B2282 first (See DTC B2282 Vehicle Speed Signal Malfunction  ).

B: GO TO DTC B2282 

C: CHECK INTERMITTENT PROBLEMS 

A: Go to Next Step 

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  4

NG: Go to Next Step 

1. Delete the DTCs (See DTC CHECK / CLEAR ).
2. Check for DTCs (See DIAGNOSTIC TROUBLE CODE CHART ).

   OK: No DTC is output. 

NG: GO TO BRAKE CONTROL SYSTEM 

OK: REPLACE MAIN BODY ECU 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A36 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   A36-12 (SPI) - E20-14 (SI)	Always	Below 1 Ω
   A36-12 (SPI) or E20-14 (SI) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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 E20-14 (SI) and body ground.
   4. Turn the engine switch on (IG).
   5. Turn the wheel slowly.
      Fig 2: Identifying E20 Combination Meter 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 3: Waveform Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SKID CONTROL ECU 

OK: REPLACE COMBINATION METER