Speedometer Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Chassis / ABS/VSC/TRAC /Data List.
5. Check the values by referring to the table below.

   ABS/VSC/TRAC

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   FR Wheel Speed	Wheel speed sensor (FR) reading/min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	-
   FL Wheel Speed	Wheel speed sensor (FL) reading/min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	-
   RR Wheel Speed	Wheel speed sensor (RR) reading/min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	-
   RL Wheel Speed	Wheel speed sensor (RL) reading/min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	-

   OK

   Vehicle speed display on the Techstream is almost the same as the actual vehicle speed.

NG → GO TO BRAKE CONTROL SYSTEM 

OK: Go to next step 

Fig 1: Identifying C6 Combination Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the C6 meter connector.
2. Using an oscilloscope, check the signal waveform of the meter.

   Tester Connection	Tool setting	Vehicle condition
   C6-25 - Body ground	5V/DIV., 20 ms./DIV.	Driving at approx. 20 km/h (12.4 mph)

   OK

   As shown in the illustration.

   HINT: 

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

NG → See step   3 

OK → REPLACE COMBINATION METER ASSEMBLY 

Fig 2: Identifying Combination Meter And Brake Actuator Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the C6 meter connector.
2. Disconnect the S1 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   C6-25 - S1-26	Below 1 Ω
   C6-25 - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

Fig 3: Identifying Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the S1 ECU connector.
2. Measure the voltage of the wire harness side connector.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   S1-26 - Body ground	Ignition switch ON	11 to 14 V

3. Measure the resistance of the wire harness side connector.

   Standard resistance

   Tester Connection	Specified Condition
   S1-26 - Body ground	Below 1 Ω

NG → REPLACE COMBINATION METER ASSEMBLY 

OK → REPLACE BRAKE ACTUATOR ASSEMBLY