Basic Inspection Procedure

Measuring Condition of Electronic Parts' Resistance

Confirm that the symptom has disappeared after performing the road test, may be high or low. So all resistance must be measured at ambient temperature (20°C, 68°F), unless stated otherwise.

Intermittent Problem Inspection Procedure 

In terms of troubleshooting, the most difficult case is that a symptom which caused trouble cannot be simulated during testing. For example, a symptom appears if the vehicle is cold but not appear if it is warm. In this case, the service technician should understand the "Customer Problem Analysis Sheet" and reproduce the environment and condition in which the vehicle showed the symptom.

1. Clear Diagnostic Trouble Code (DTC).
2. Inspect the connector, and check the terminal for poor connections, loose wires and bent, broken or corroded pins. And check whether the connectors are securely fastened.

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3. Slightly shake the connector and wiring harness up and down or from side to side.
4. Repair or replace the problematic component.
5. The resistance measured at high temperature after running the vehicle.
   • Simulating Vibration
     1. Sensors and Actuators

        : Slightly vibrate sensors, actuators or relays by hand.

        WARNING:

        • Strong vibration may break sensors, actuators or relays
     2. Connectors and Harness

        : Lightly shake the connector and wiring harness up and down or from side to side.

   • Simulating Heat
     1. With a hair dryer or other devices, apply heat to the components suspected of being the cause of the malfunction
        WARNING:

        • DO NOT heat components to the point where they may be damaged.
        • DO NOT heat the ECM directly.
   • Simulating Water Sprinkling
     1. Sprinkle water onto vehicle to simulate a rainy day or a high humidity condition.
     WARNING:

     • DO NOT sprinkle water directly into the engine compartment or electronic components.
   • Simulating Electrical Load
     1. Turn on all electrical systems to simulate excessive electrical loads (Radios, fans, lights, rear window defogger, etc.).