Basic Procedures

Basic Diagnostics Procedure

The most important purpose of diagnostics is to determine which part is malfunctioning quickly, to save time and labor.

A: IDENTIFICATION OF TROUBLE SYMPTOM
Determine what the problem is based on the symptom

B: PROBABLE CAUSE OF TROUBLE
Look at the wiring diagram and check the system's circuit Then check the switch, relay, fuse, ground, etc.

C: LOCATION AND REPAIR OF TROUBLE
1. Using the diagnostics narrow down the causes.
2. If necessary, use a voltmeter, ohmmeter, etc.
3. Before replacing certain component parts (switch, relay, etc.), check the power supply, ground, for open wiring harness, poor connectors, etc. If no problems are encountered, check the component parts.

D: CONFIRMATION OF SYSTEM OPERATION
After repairing, ensure that the system operates properly.