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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1158 (Engine Control System - DTCS U1000 To P0159) >> DTC U1000, U1001 Can Communication Line >> On Board Diagnosis Logic

On Board Diagnosis Logic

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTING CONDITION POSSIBLE CAUSE

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
U1000(1)
1000(1)		 CAN communication line
  • When ECM is not transmitting or receiving CAN communication signal of OBD (emission-related diagnosis) for 2 seconds or more.
  • Harness or connectors (CAN communication line is open or shorted)
U1001(2)
1001(2)
  • When ECM is not transmitting or receiving CAN communication signal other than OBD (emission-related diagnosis) for 2 seconds or more.
(1) This self-diagnosis has the one trip detection logic.
(2) The MIL will not light up for this diagnosis.
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