Troubleshooting After Code Retrieval

The diagnostic code leads only to a circuit level diagnosis. A pinpoint test of the circuit indicated will be required to isolate the problem down to the component or wiring level.

To find the appropriate diagnostic procedure to follow:

• Refer to the last column of the repair manual "Diagnostic Codes" list.

• This will lead to one or more "Troubleshooting with a Voltmeter/Ohmmeter" diagnostic charts which will facilitate circuit diagnosis.

• This may also lead to an "Inspection of Component" procedure which will facilitate diagnosis of the sensor or actuator in the circuit.

But what if you do not have a diagnostic code to help lead you to the cause of the customer complaint? What do you do next? Before we address the third step in the systematic diagnostic approach, the subject of an inoperative self diagnostic system must be addressed.

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