Speedometer Malfunction: Procedure

1. Connect Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the tester ON.
4. Enter the following menus: Body Electrical / Combination Meter / Active Test.
5. Check the operation by referring to the table below.
   COMBINATION METER:
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Speed Meter Operation	Speedometer	0, 40, 80, 120 mph (*1)	-
   		0, 40, 80, 120, 160, 200, 240 km/h (*2)

   *1: U.S.A.

   *2: except for models for U.S.A.

   OK

   Needle indication is normal.

NG → REPLACE COMBINATION METER 

OK: Go to next step 

1. Connect Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the tester ON.
4. Enter the following menus: Body Electrical / Combination Meter / Data List.
5. Check the values by referring to the values in the table below.
   COMBINATION METER:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Vehicle Speed Meter	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	Almost same as actual speed (When driving)	-

   OK

   Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.

OK → REPLACE COMBINATION METER 

NG: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the tester 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	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Almost same as actual speed (When driving)	-
   FL Wheel Speed	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Almost same as actual speed (When driving)	-
   RR Wheel Speed	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Almost same as actual speed (When driving)	-
   RL Wheel Speed	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Almost same as actual speed (When driving)	-

   OK

   Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.

NG → See step   7 

OK: Go to next step 

1. Disconnect the A13 ECU connector.
   Fig 1: Identifying A13 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage of the wire harness side connector.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   A13-7 (SP1) - Body ground	Power switch ON (IG)	10 to 14 V

NG → See step   6 

OK: Go to next step 

1. Check the input signal waveform.
   Fig 2: Identifying Combination Meter Connector Terminals And Input Signal Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the combination meter with the connector still connected.
   2. Connect the oscilloscope to the terminals K31-29 and body ground.
   3. Start the engine.
   4. Check the signal waveform of the connector.

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

      OK

      As shown in the illustration

      HINT: 

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

NG → REPLACE SKID CONTROL ECU 

OK → REPLACE COMBINATION METER 

1. Disconnect the K31 meter connector.
   Fig 3: Identifying K31 Meter And A13 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A13 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   K31-29 (SI) - A13-7 (SP1)	Below 1 Ω
   K31-29 (SI) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE COMBINATION METER