Diagnostic System Check - Engine Controls (Chart 2 of 2)

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OBD System Check

Schematic

If a scan tool can not communicate with the PCM, chart 2 of 2 will isolate the cause. If the engine starts and runs OK, it indicates the PCM is functional and the problem is in the serial data link.

A problem with loss of power to the PCM or faulty ground circuits will be in...

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Document Tags

Document Title: Diagnostic System Check - Engine Controls (Chart 2 of 2)

scan

tool

serial

data

loss

classii

communications

volts