Vehicle Speed Signal Circuit between Navigation ECU and Combination Meter [08/2019 - ]: Procedure
- CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)
- Check the output waveform.
*a Component with harness connected
(Combination Meter Assembly)- Remove the combination meter assembly with the connector still connected.
- Connect an oscilloscope to terminal J10-19 (+S) and body ground.
- Turn the engine switch on (IG).
- Turn a wheel slowly.
- Check the signal waveform according to the condition(s) in the table below.
Item Condition Measurement terminal J10-19 (+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 [08/2019 - ]
Result:
OK
See step 2
- Check the output waveform.
- INSPECT NAVIGATION ECU (INPUT WAVEFORM)
- Check the input waveform.
*a Component with harness connected
(Navigation ECU)- Remove the navigation ECU with the connector(s) still connected.
- Connect an oscilloscope to terminal J153-9 (SPD) and body ground.
- Turn the engine switch on (IG).
- Turn a wheel slowly.
- Check the signal waveform according to the condition(s) in the table below.
Item Condition Measurement terminal J153-9 (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
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [08/2019 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Check the input waveform.