(1) Reconnect the F15 combination meter assembly connector.
(2) Remove the combination meter assembly with the connector(s) still connected.
(3) Connect an oscilloscope to terminal F15-3 (+S) and body ground.
(4) Turn the engine switch on (IG).
(5) Turn a wheel slowly.
(6) Check the signal waveform according to the condition(s) in the table below.
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.
Text in Illustration
NG -- GO TO METER / GAUGE SYSTEM See: Instrument Panel, Gauges and Warning Indicators/Testing and
Inspection/Component Tests and General Diagnostics/Speed Signal Circuit
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR
(a) Disconnect the G4 display and navigation module display connector.
(b) Disconnect the F15 combination meter assembly connector.
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