IN08W−01Vehicle Brought to WorkshopCustomer ProblemAnalysisSymptom Confirmationand Diagnostic TroubleCode CheckSymptom SimulationDiagnostic TroubleCode ChartProblem Symptoms TableCircuit Inspection or PartsInspectionRepairConfirmation TestEnd12435678Ask the customer about the conditions and theenvironment when the problem occurred.1Confirm the symptoms and the problem conditions,and check the diagnostic trouble codes.(When the problem symptoms do not appearduring confirmation, use the symptom simulationmethod described later on.)2, 3Check the results obtained in Step 2, then confirmthe inspection procedure for the system or the partwhich should be checked using the diagnostictrouble code chart or the problem symptoms table.4, 5, 6Check and repair the affected system or part inaccordance with the instructions in Step 6.7After completing repairs, confirm that the problemhas been eliminated.(If the problem is not reproduced, perform theconfirmation test under the same conditions andin the same environment as when it occurred forthe first time.)8IN−24−INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLEDSYSTEMSLAND CRUISER (W/G)(RM616E)HOW TO PROCEED WITH TROUBLESHOOTINGCarry out troubleshooting in accordance with the procedure on the following page. Here, only the basic pro-cedure is shown. Details are provided in Diagnostics section, showing the most effective methods for eachcircuit. Confirm the troubleshooting procedures first for the relevant circuit before beginning troubleshootingof that circuit.