DTC B15C2: Speed Signal Malfunction [06/2015 - 01/2018]: Procedure

1. Enter the "System Sensors Check" screen. Refer to Check System Sensors in Operation Check.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Refer to OPERATION CHECK [06/2015 - 01/2018]

2. While driving the vehicle, compare the value of "Speed" to the reading on the speedometer. Check if these readings are almost equal.

   HINT: 

   The combination meter assembly receives the vehicle speed signal from the skid control ECU via CAN communication. Therefore, perform the following inspection referring to values on the Data List of the skid control ECU because it is the source of the vehicle speed signal.

   OK

   Vehicle speed displayed on the "System Sensors Check" screen is almost the same as the actual vehicle speed measured using the Techstream.

   Refer to DATA LIST / ACTIVE TEST [06/2015 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL [06/2015 - 01/2018] 

Result: 

NG 

See step  2

1. Check the output waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Combination Meter Assembly)

   1. Remove the combination meter assembly with the connector(s) still connected.
   2. Connect an oscilloscope to terminal G13-19 (+S) and body ground.
   3. Turn the power switch on (IG).
   4. Turn a wheel slowly.
   5. Check the signal waveform according to the condition(s) in the table below.

      Item	Condition
      Measurement terminal	G13-19 (+S) - Body ground
      Tool setting	5 V/DIV., 20 ms./DIV.
      Vehicle condition	Wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO METER / GAUGE SYSTEM. Refer to  Speed Signal Circuit [06/2015 - 01/2018] 

Result: 

OK 

See step  3

1. Check the input waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Navigation Receiver Assembly)

   1. Remove the navigation receiver assembly with the connector(s) still connected.
   2. Connect an oscilloscope to terminal G105-17 (SPD) and body ground.
   3. Turn the power switch on (IG).
   4. Turn a wheel slowly.
   5. Check the signal waveform according to the condition(s) in the table below.

      Item	Condition
      Measurement terminal	G105-17 (SPD) - Body ground
      Tool setting	5 V/DIV., 20 ms./DIV.
      Vehicle condition	Wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL [06/2015 - 01/2018] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR