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Home >> Saturn >> 2002 >> SC2 Automatic, MP6 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Data Link Communication System -- "S" Series >> Diagnostic Information and Procedures >> DTC U1000 and U1255 >> Diagnostic Aids

Diagnostic Aids

IMPORTANT: If only one other U-type DTC is set, diagnose that DTC first. If two or more other U-type DTCs are set, perform the Vehicle On-Board Diagnostic (OBD) System Check (Chart 1 of 2) .

This DTC indicates that a module did not communicate with another modules when the ignition was first turned On.

The Class II circuit is in a ring configuration. An individual open in circuit 1807 will NOT affect communications.

Check for module connector tightness and broken connector locks.

To locate an intermittent problem, use the scan tool to monitor each individual controller located under DIAGNOSTIC CIRCUIT CHECK- - - CLASS II MESSAGE MONITOR with ignition On, engine Off. INACTIVE will be displayed if a controller is not communicating on the Class II link.

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