Meter / Gauge System Speedometer Malfunction

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (ECU-IG & GAUGE)

CHECK VEHICLE SPEED SENSOR

CHECK COMBINATION METER ASSEMBLY

CHECK WIRE HARNESS (SENSOR - BATTERY AND BODY GROUND)

CHECK WIRE HARNESS (SENSOR - METER)

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Remove the ECU-IG & GAUGE fuse from the driver side junction block.
   

2. Measure the resistance of the fuse.
   

   Standard resistance:

   Below 1 Ω
   

1. Measure the voltage of the sensor.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   2 - 3	Ignition switch ON Shift lever on N Slowly rotate rear wheel	10 to 14 V (Pulse generation)

   HINT:

   Connect the tester's positive (+) lead to terminal 3, and negative (-) lead to terminal 2.

1. Disconnect the C10 meter connector.
   

2. Using an oscilloscope, check the signal waveform of the meter.
   

   Tester Connection	Tool Setting	Vehicle Condition
   C10-5 - Body ground	5 V/DIV., 20 msec./DIV.	Drive vehicle at 20 km/h (12 mph)

   OK:

   Refer to the illustration.
   

   HINT:

   As the vehicle speed increases, the wavelength shortens.

1. Disconnect the S3 sensor connector.
   

2. Measure the voltage of the wire harness side connector.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   S3-1 (IG+) - Body ground	Ignition switch ON	10 to 14 V
   S3-1 (IG+) - Body ground	Ignition switch OFF	Below 1 V

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

   Standard resistance:

   Tester Connection	Specified Condition
   S3-2 (SE) - Body ground	Below 1 Ω

1. Disconnect the S3 sensor connector.
   

2. Disconnect the C10 meter connector.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   S3-3 (SI) - C10-5	Below 1 Ω
   S3-3 (SI) - Body ground	10 kΩ or higher