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Test Procedure

NOTE: Check for applicable service bulletins before proceeding with this test. Perform this test only if there is a driveability complaint or if you have been directed here from another section in the service information. Do not turn the ignition OFF when performing this diagnostic procedure. Do not clear the DTCs unless instructed by this diagnostic procedure.
  1. Install a scan tool. Turn ON the ignition, with the engine OFF. Does the scan tool turn ON? If scan tool turns on, go to next step. If not, go to TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in BODY CONTROL MODULES - AZTEK article.
  2. Attempt to establish communication with the PCM. Does the scan tool communicate with the PCM? If scan tool communicates with PCM, go to next step. If scan tool does not communicate with PCM, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - AZTEK article.
  3. Select the powertrain control module DISPLAY DTCs function on the scan tool. Does the scan tool display any DTCs? If DTCs are displayed, go to next step. If no DTCs are displayed, diagnose by symptom under TROUBLE SHOOTING  . If no symptoms exist, diagnose using scan tool. See SCAN TOOL DIAGNOSTICS  .
  4. Does the scan tool display any DTCs which begin with a "U"? If DTCs beginning with "U" are displayed, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - AZTEK article. If other DTCs are displayed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.4L "A", "B" & "U" SERIES TRUCKS article in ENGINE PERFORMANCE.
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