Speedometer Malfunction: Procedure
- PERFORM ACTIVE TEST USING TECHSTREAM SPEED METER OPERATION
- Connect the Techstream to the DLC3.
- Turn the ignition switch to the ON position.
- Turn the Techstream on.
- Enter the following menus: Body Electrical / Combination Meter / Active Test.
- 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) Confirm that the vehicle is stopped, engine idling 0, 40, 80, 120, 160, 200, 240 km/ h (*2) HINT:
*1: for U.S.A.
*2: except for U.S.A.
OK
Needle indication is within the allowable range.
NG → REPLACE COMBINATION METER ASSEMBLY
OK: Go to next step
- READ VALUE USING TECHSTREAM (VEHICLE SPEED METER)
- Connect the Techstream to the DLC3.
- Turn the ignition switch to the ON position.
- Turn the Techstream on.
- Enter the following menus: Body Electrical / Combination Meter / Data List.
- 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 measured using a speedometer tester (calibrated chassis dynamometer).
NG → See step 3
OK → REPLACE COMBINATION METER ASSEMBLY
- READ VALUE USING TECHSTREAM (FR/FL/RR/RL WHEEL SPEED)
- Connect the Techstream to the DLC3.
- Turn the ignition switch to the ON position.
- Turn the Techstream on.
- Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
- 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 vehicle speed (When driving) - FL Wheel Speed Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Almost same as actual vehicle speed (When driving) - RR Wheel Speed Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Almost same as actual vehicle speed (When driving) - RL Wheel Speed Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Almost same as actual vehicle speed (When driving) - OK
Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.
NG → Go To The Appropriate BRAKE CONTROL SERVICE INFORMATION
OK: Go to next step
- INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)
- Disconnect the S1 connector.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
Tester Connection Condition Specified Condition S1-12 (SP1) - Body ground Turn the ignition switch to the ON position. 10 to 14 V
NG → See step 6
OK: Go to next step
- INSPECT SKID CONTROL ECU (INPUT WAVEFORM)
- Check the input signal waveform.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Remove the combination meter assembly with connector(s) still connected.
- Connect the oscilloscope to terminal C9-18 (SPEED SIGNAL) and body ground.
- Start the engine.
- 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:
As the vehicle speed increases, the cycle of the signal waveform narrows.
NG → REPLACE SKID CONTROL ECU
OK → REPLACE COMBINATION METER ASSEMBLY
- Check the input signal waveform.
- CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU)
- Disconnect the C9 and S1 connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition C9-18 (SPEED SIGNAL) - S1-12 (SP1) Always Below 1 Ω C9-18 (SPEED SIGNAL) - Body ground Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → REPLACE COMBINATION METER ASSEMBLY