Montana, Silhouette, Venture 2000-2005

Diagnostic System Checks

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  1. Ensure that the battery, and the vehicle primary power and ground systems are functioning correctly.
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  3. With scan tool attached, check for proper communication. Lack of communication may be due to a particular malfunction of a serial data circuit. Further scan tool or communications diagnosis may be required.
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  5. With the scan tool, check that all indicated engine electronic modules are operating in the incorrect power mode, based on key position. If not, this may cause other vehicle symptoms and/or DTCs to set.
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  7. With the scan tool, check for any Power Mode Mismatch and correct the condition before checking for module DTCs or symptoms.
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  9. Ensure that all data link communication DTCs are diagnosed before system level DTCs.
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  11. Ensure that all electronic control unit (ECU) internal DTCs are diagnosed before other system level DTCs.
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  13. Ensure that all device voltage DTCs are diagnosed before other system level DTCs.
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