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4.3L Engines

  1. Ensure ignition switch is in OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. If scan tool powers up, go to next step. If scan tool does not power up, see TEST B: SCAN TOOL INOPERATIVE  under SYSTEM TESTS.
  2. Use scan tool to attempt communications with EBCM, HVAC module, Instrument Panel Cluster (IPC), PCM, and Vehicle Theft Deterrent (VTD) module. If scan tool communicates with specified modules, go to next step. If communications can not be established, see TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Attempt to start engine. If engine starts, go to next step. If engine does not start, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  4. Select DTC display function for EBCM, HVAC, IPC, PCM and VTD modules. If DTCs are retrieved go to next step. If no DTCs are retrieved go to step  9.
  5. Use scan tool to select CAPTURED INFO and store DTCs, then go to next step.
  6. If scan tool displays DTCs which begin with "U", see TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS. If any other DTCs are displayed, go to next step.
  7. If scan tool displays DTCs P0601, P0602, P0604, or P01683, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs are retrieved, go to next step.
  8. If scan tool displays DTCs P0562, P0563, P1637 or P1638, see ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK . If any other DTCs are retrieved, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . Perform repairs as necessary.
  9. If customers concern is not with transmission, go to next step. If customers concern is with transmission, see AUTOMATIC TRANSMISSION DIAGNOSTIC SYSTEM CHECK .
  10. If customer's concern is related to engine emissions and/or performance, see appropriate EMISSIONS APPLICATIONS article in ENGINE PERFORMANCE. If concern is not related to emissions, go to TROUBLESHOOTING - NO CODES - TRUCKS article in ENGINE PERFORMANCE.
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