Diagnostic Circuit Check Test

Diagnostic Circuit Check determines if: 1) the ECM is operating and can recognize a fault, and 2) if any faults exist. This is the starting point for any diagnosis. If no faults are indicated, go to the Diesel Diagnostic Check Tester Check.

Fig 1: Diagnostic Circuit Check Flow Chart

Fig 2: Diagnostic Circuit Check Flow Chart (1 Of 2)

Fig 3: Diagnostic Circuit Check Flow Chart (2 Of 2)