System Diagnostic Trouble Code Check Input Signal Check Sensor Check Other

System diagnostic trouble code check input signal

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System Diagnostic Trouble Code Check Input Signal Check (Sensor Check) Other Diagnosis Function Engine Automatic Transmission Anti–Lock Brake System (& Traction Control) Supplemental Restraint System Cruise Control f (with Test Mode) f (with Test Mode) f f f f f f f Diagnostic Test Mode Diagnostic Test Mode In diagnostic trouble code check, it is very important to determine whether the problem indicated by the diag- nostic trouble code is still occurring or occurred in the past but returned to normal at present. In addition, it must be checked in the problem symptom check whether the malfunction indicated by the diagnostic trouble code is directly related to the problem symptom or not. For this reason, the diagnostic trouble codes should be checked before and after the symptom confirmation to determine the current conditions, as shown in the table below. If this is not done, it may, depending on the case, result in unnecessary troubleshooting for normally operating systems, thus making it more difficult to locate the problem, or in repairs not pertinent to the problem. Therefore, always follow the procedure in correct order and perform the diagnostic trouble code check.
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Diagnostic trouble code check Making a note of and clearing of the diagnostic trouble codes displayed Symptom confirmation No problem symptoms exist Problem symptoms exist Simulation test using the symptom simulation methods D Normal code displayed D Problem symptoms exist D Normal code displayed D No problem symptoms exist Diagnostic trouble code check Troubleshooting of problem indicated by diagnostic trouble code D Diagnostic trouble code displayed D Problem symptoms exist System Normal Troubleshooting of each problem symptom If a diagnostic trouble code was displayed in the initial diagnostic trouble code check, it indicates that the trouble may have occurred in a wire harness or connector in that circuit in the past. Therefore, check the wire harness and con- nectors (See page IN–27 ). IN–20 INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS 20 AuthorĂ: DateĂ: 1997 LEXUS ES300 (RM511U) Taking into account the above points, a flow chart showing how to proceed with troubleshooting using the diagnostic trouble code check is shown below. This flow chart shows how to utilize the diagnostic trouble code check effectively, then by carefully checking the results, indicates how to proceed either to diagnostic trouble code troubleshooting or to troubleshooting of problem symptoms.
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V07268 VIBRATION METHOD: When vibration seems to be the major cause. CONNECTORS WIRE HARNESS PARTS AND SENSOR 1 Slightly shake the connector vertically and horizontally. Slightly shake the wire harness vertically and horizontally. The connector joint, fulcrum of the vibration, and body through portion are the major areas to be checked thorough- ly.
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  • Spring '14
  • Lexus, Engine control unit, LEXUS ES300, diagnostic trouble

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