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On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION DTC SET CONDITION POSSIBLE CAUSE U0001 High speed CAN defective With the ignition switch on ECM detected that • Harness or • TCM • ECM DTC Confirmation Procedure: Before performing the following procedure, confirm that battery voltage is more than 12 V. • Turn ignition switch off. • Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available. • Turn ignition switch on. • With the scan tool, record and erase stored DTCs in the ECM. • Cycle ignition switch several times then select view DTC and data stream. • If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1. • If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou- bleshooting in Section 03 Electronic Engine Controls for more information. NOTE : • Before performing any DTC diagnostic procedures, verify the ECM power and ground circuits are properly con- nected. • Before performing the diagnostic procedure, settle all other ECM DTCs first. NOTE : DIAGNOSIS & TESTING 03
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