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GENERAL - How to Use Troubleshooting/Inspection Service Points 00-13 INSPECTION SERVICE POINTS FOR A BLOWN FUSE Remove the blown fuse and measure the resistance between the load side of the blown fuse and the earth. Set the switches of all circuits which are connected to this fuse to a condition of continuity. If the resistance is almost 0 Ω at this time, there is a short somewhere between these switches and the load. If the resistance is not 0 Ω, there is no short at the present time, but a momentary short has probably caused the fuse to blow. Harness being clamped by the vehicle body D Damage to the outer casing of the harness due to wear or heat D Water getting into the connector or circuitry D Human error (mistakenly shorting a circuit, etc.) POINTS TO NOTE FOR INTERMITTENT MALFUNCTIONS Intermittent malfunctions often occur under certain conditions, and if these conditions can be ascertained, determining the cause becomes simple. In order to ascertain the conditions under which an intermittent malfunction occurs, first ask the customer for details about the driving conditions, weather conditions, frequency of occurrence and trouble symptoms, and then try to recreate the trouble symptoms. Next, ascertain whether the reason why the trouble symptom occurred under these conditions is due to vibration, temperature or some other factor. If vibration is thought to be the cause, carry out the following checks with the connectors and components to confirm whether the trouble symptom occurs. The objects to be checked are connectors and components which are indicated by inspection procedures or given as probable causes (which generates diagnosis codes or trouble symptoms.) Gently shake the connector up, down and to the left and right. D Gently shake the wiring harness up, down and to the left and right. Check the branch point of wiring harness connector closely. D Gently rock each sensor and relay, etc. by hand. D Gently shake the wiring harness at suspensions and other moving parts. NOTE If determining the cause is difficult, the flight recorder function of the MUT-II can also be used. Fuse Battery Load Load Short circuit |