Lexus ES: Vehicle Speed Signal Circuit between Navigation ECU and Combination Meter
DESCRIPTION
The navigation ECU receives a vehicle speed signal from the combination meter assembly.
HINT:
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A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls its respective systems based on this pulse signal.
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If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the following diagram will not operate normally.
WIRING DIAGRAM
PROCEDURE
1. | CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) |
(a) Check the output waveform. (1) Remove the combination meter assembly with the connector still connected. (2) Connect an oscilloscope to terminal G17-19 (+S) and body ground. (3) Turn the engine 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 | G17-19 (+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. | | *a | Component with harness connected (Combination Meter Assembly) | | |
OK | | |
2. | INSPECT NAVIGATION ECU (INPUT WAVEFORM) |
(a) Check the input waveform. (1) Remove the navigation ECU with the connector(s) still connected. (2) Connect an oscilloscope to terminal G14-9 (SPD) and body ground. (3) Turn the engine 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 | G14-9 (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. | | *a | Component with harness connected (Navigation ECU) | | |
NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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