Speedometer Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream 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	for U.S.A.: There is a deviation in the values displayed on the speedometer (Control range → Speedometer display) 0 → 0 40 → 40.0 to 43.5 80 → 80.0 to 84.5 120 → 120.0 to 125.5
   		0, 40, 80, 120, 160, 200, 240 km/h*2	for Canada: There is a deviation in the values displayed on the speedometer (Control range → Speedometer display) 0 → 0 40 → 38.0 to 42.0 80 → 78.0 to 84.0 120 → 119.0 to 125.0 160 → 159.0 to 167.0 200 → 199.0 to 209.0 240 → 239.0 to 251.0
   			for Others: There is a deviation in the values displayed on the speedometer (Control range → Speedometer display) 0 → 0 40 → 41.7 to 46.2 80 → 83.4 to 88.4 120 → 125.1 to 130.6 160 → 166.2 to 173.2 200 → 207.7 to 215.7 240 → 249.2 to 258.0

   • *1: for U.S.A.
   • *2: except U.S.A.

   OK

   Speedometer indication is normal.

NG → See step   7 

OK: Go to next step 

1. Check if brake control system DTC is output.

   Result

   Result	Proceed to
   Brake control system DTC is not output.	A
   Brake control system DTC is output.	B

B → See step   3 

A → See step   7 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus:
   1. for Combination Meter: Body Electrical / Combination Meter / Data List.
   2. for ABS/VSC/TRAC: Chassis / ABS/VSC/TRAC / 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 (speedometer tester)	-

   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 (speedometer tester)	-
   FL Wheel Speed	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Almost same as actual speed (speedometer tester)	-
   RR Wheel Speed	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Almost same as actual speed (speedometer tester)	-
   RL Wheel Speed	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Almost same as actual speed (speedometer tester)	-

   OK

   When the Data List values of the ECUs match, an internal malfunction of the combination meter assembly is suspected.

   NG

   When the Data List values of the ECUs do not match, a signal output error of the skid control ECU or an internal malfunction of the combination meter assembly is suspected.

NG → See step   4 

OK → See step   8 

1. Disconnect the A58 connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A58-11 (SP1) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Skid Control ECU)

NG → See step   6 

OK: Go to next step 

1. Check the input signal waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   1. Remove the combination meter assembly with connector(s) still connected.
   2. Reconnect the A58 connector.
   3. Reconnect the J34 connector.
   4. Connect the oscilloscope to the terminals J34-17 (SI) and body ground.
   5. Turn the engine switch on (IG).
   6. Turn the drive wheel slowly.
   7. Check the signal waveform according to the condition(s) in the table below.

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

      OK

      The waveform is displayed as shown in the illustration.

      HINT: 

      When the system is functioning normally, one drive wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

      TEXT IN ILLUSTRATION
      
      

      *1	Component with harness connected (Combination Meter Assembly)

NG → See step   9 

OK → See step   7 

1. Disconnect the J34 and A58 connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A58-11 (SP1) - J34-17 (SI)	Always	Below 1 Ω
   A58-11 (SP1) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Combination Meter Assembly)
   *2	Front view of wire harness connector (to Skid Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7