Inspection Procedure

1. Drive the vehicle and check if the function of the speedometer in the combination meter is normal.

   OK: Actual vehicle speed and the speed indicated on the speedometer are the same. 

   HINT:

   • The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, refer to "Operation Check" in the meter/gauge system (See OPERATION CHECK ).
   • The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.

NG: GO TO METER / GAUGE SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

OK: Go to Next Step 

1. Disconnect the I6 navigation receiver assembly connector.
2. Jack up the drive wheels.
3. Move the shift lever to the neutral position.
4. Turn the ignition switch to ON.
5. Using an oscilloscope, check the signal waveform of the meter.

   Waveform 

   WAVEFORM REFERENCE
   
   

   Terminal Connections	I6-3(SPD) - Body ground
   Tester Range	5 V/DIV., 20 msec./ DIV.
   Vehicle Condition	Drive vehicle at 20 km/h (12 mph)

   HINT:

   As the vehicle speed increases, the wavelength shortens.

   OK: Voltage pulses as shown in the illustration 

6. Reconnect the navigation receiver assembly connector.

NG: Go to step 3 

Fig 1: Identifying I6 Navigation Receiver Assembly Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE NAVIGATION RECEIVER ASSEMBLY  (See REMOVAL  )

1. Disconnect the I6 navigation receiver assembly connector.
2. Disconnect the H37 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   I6-3 (SPD) - H37-35 (+S)	Always	Below 1 Ω
   I6-3 (SPD) - Body ground	Always	10 kΩ or higher

4. Reconnect the navigation receiver assembly connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying I6 Navigation Receiver Assembly And H37 Combination Meter Assembly Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE NAVIGATION RECEIVER ASSEMBLY  (See REMOVAL  )