DESCRIPTION
The navigation ECU receives a vehicle speed signal from the combination meter assembly.
HINT:
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 J10-19 (+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.
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. |
|
NG | ![]() | GO TO METER / GAUGE SYSTEM |
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2. | CHECK 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 J153-9 (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.
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. |
|
OK | ![]() | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual > Intake Manifold: Components
COMPONENTS ILLUSTRATION *A for TMMC Made *B except TMMC Made *1 VENTILATION HOSE *2 PURGE VALVE (PURGE VSV) *3 NO. 1 FUEL VAPOR FEED HOSE *4 NO. 2 SURGE TANK STAY *5 INTAKE AIR SURGE TANK ASSEMBLY *6 AIR SURGE TANK TO INTAKE MANIFOLD GASKET *7 VACUUM HOS ...
Lexus RX (RX 350L, RX450h) 2016-2022 Owners Manual > Driving tips: Utility vehicle
precautions
This vehicle belongs to the utility vehicle class, which has higher
ground clearance
and narrower tread in relation to the height of its center of gravity.
Utility vehicle feature
Specific design characteristics give it a higher center of gravity than
ordinary
passenger cars. This vehic ...