Navigation System Vehicle Speed Signal Circuit Between Multi-Display And Combination Meter

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK SPEEDOMETER

INSPECT MULTI-DISPLAY

CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY)

CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY)

DESCRIPTION

HINT:

1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
   
2. If a short occurs in an ECU, all systems in the diagram below will not operate normally.
   

WIRING DIAGRAM

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 vehicle speed sensor is functioning normally when the indication on the speedometer is normal.

1. Disconnect the multi-display connector J50.
   

2. Measure voltage.
   

   1. Jack up either one of the drive wheels.
      

   2. Move the shift lever to the neutral position.
      

   3. Turn the engine switch on (IG).
      

   
   
   

   4. Measure the voltage between terminal SPD of the multi-display and body ground when the drive wheels are turned slowly.
      

      OK:

      Voltage pulses as shown in the illustration.
      

1. Disconnect the multi-display connector J50 and combination meter connector J34.
   

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   SPD - +S	Engine switch off	Below 1 Ω

1. Disconnect the multi-display connector J50 and combination meter connector J34.
   

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   SPD - Body ground	Engine switch off	10 kΩ or higher

   HINT:

   If the resistance between terminal SPD and body ground is less than 10 kΩ, there may be a short in a wire harness, connector, or an ECU that is connected to the SPD signal wire.