Speedometer Malfunction

WIRING DIAGRAM

INSPECTION PROCEDURE

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER

1. Operate the intelligent tester according to the steps on the display and select "ACTIVE TEST".

   METER 

   Item	Test Details	Diagnostic Note
   Speed Meter Operation	0 / 40 (24) / 80 (48) / 120 (72) / 160 (96) / 200 (120) km/h (mph)	-

   OK:

   Needle indication is within the allowable range.
   

NG	REPLACE COMBINATION METER ASSEMBLY

OK

2. READ VALUE OF INTELLIGENT TESTER

1. Operate the intelligent tester according to the steps on the display and select "DATA LIST".

   METER 

   Item	Measurement Item/Range (Display)	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.
   

NG	Go to step 3

OK
REPLACE COMBINATION METER ASSEMBLY

3. READ VALUE OF INTELLIGENT TESTER

1. Operate the intelligent tester according to the steps on the display and select "DATA LIST".

   ABS 

   Item	Measurement Item/Range (Display)	Normal Condition	Diagnostic Note
   FR/FL/RR/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	GO TO BRAKE CONTROL SYSTEM

OK

4. INSPECT COMBINATION METER ASSEMBLY

1. Disconnect the S40 connector.

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   S40-22 (SP1) - Body ground	Turn the ignition switch to the ON position.	10 to 14 V

NG	Go to step 6

OK

5. INSPECT COMBINATION METER ASSEMBLY

1. Check the input signal waveform.

   1. Remove the combination meter assembly with connector(s) still connected.

   2. Connect the oscilloscope to the terminals C9-18 (SPEED SIGNAL) and body ground.

   3. Start the engine.

   4. Check the signal waveform according to the condition(s) in the table below.

      OK 

      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 ABS & TRACTION ACTUATOR ASSEMBLY

OK
REPLACE COMBINATION METER ASSEMBLY

6. CHECK HARNESS AND CONNECTOR (COMBINATION METER AND ABS & TRACTION ACTUATOR ASSEMBLY)

1. Disconnect the C9 and S40 connectors.

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   C9-18 (SPEED SIGNAL) S40-22 (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