|
|
DIAGNOSING ELECTRICAL FAILURES Performing Efficient Electrical Circuit Diagnosis and Troubleshooting STEP DESCRIPTION Step 1 Obtain detailed information about the conditions and the environment when the electrical Step 2 Operate the affected system, road test the vehicle if necessary. Step 3 Gather the proper diagnostic material including the following: • Electrical Power Supply Routing Diagram • System Operation Descriptions • Applicable Service Manual Sections • Check for any Service Bulletins Identify where to begin diagnosis based upon your knowledge of the system operation Step 4 Inspect the system for mechanical binding, loose connectors or wiring damage. Step 5 Repair the circuit or replace the component as necessary. Step 6 Operate the system in all modes. Verify the system functions properly under all conditions. Electrical Circuit Simulation Tests Often the symptom is not present when the vehicle is brought in for service. If possible, re-create the conditions The tests are broken into the seven following topics: • Vehicle Vibration Test • Heat Sensitive Test • Freezing Test • Water Intrusion Test • Electrical Load Test • Cold or Hot Start Up Test • Voltage Drop Test NOTE : Vehicle Vibration Test The problem may occur or become worse while driving on a rough road or when the engine is vibrating (idle with A/C Connectors & Harness shake each connector and harness while monitoring the system for the incident you are trying to duplicate. This NOTE :
|