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OK (a) Check the output waveform. (1) Remove the combination meter assembly with the connector(s) still connected. (2) Connect an oscilloscope to terminal J28-29 (+S) and body ground. (3) Turn the ignition switch to ON. (4) Turn a wheel slowly. (5) Check the signal waveform according to the condition(s) in the table below. ITEM CONDITION Measurement terminal J28-29 (+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 Text in Illustration *a Component with harness connected (Combination Meter Assembly) NG GO TO METER / GAUGE SYSTEM 2. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - (a) Disconnect the J141 stereo component amplifier assembly connector. (b) Disconnect the J28 combination meter assembly connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance: NAVIGATION: NAVIGATION SYSTEM: Vehicle Speed Signal Circuit ... |