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Home >> Isuzu >> 2003 >> Ascender 5.3 P, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 5.3L >> Self-Diagnostic System >> Diagnostic System Check - Engine Controls >> Test Description

Test Description

The numbers listed below refer to step numbers in the diagnostic procedure:

  1. 2 -  Lack of communication may be caused by a partial or a total malfunction of the Class 2 serial data circuit. The specified procedure determines the particular condition.
  2. 5 -  This step stores the Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) information into the scan tool's memory. After you complete the diagnostic procedure, review the captured information to catch the next DTC if the PCM stores multiple DTCs. Review the Freeze Frame data and the Failure Records data. Use this information to determine how frequently and how recently the DTC set. This information may help diagnose an intermittent condition. Information about the operating conditions at the time the DTC set may also help diagnose an intermittent condition. Capturing the stored information saves the data the PCM loses during the following conditions:
    • When a diagnostic procedures instructs you to clear the DTCs.
    • When a diagnostic procedure instructs you to disconnect the PCM connectors.
    • When a diagnostic procedure instructs you to replace the PCM. See appropriate REMOVAL & INSTALLATION article.
  3. 6 -  The presence of DTCs which begin with "U", indicate some other module is not communicating. Following the specified procedure will gather all the available information before you perform the tests.
  4. 8 -  If there are other modules with DTCs set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . The DTC list directs you to the appropriate diagnostic procedure. If the PCM stores multiple powertrain DTCs, diagnose the DTCs in the following order:
    • Component level DTCs, such as sensor DTCs, solenoid DTCs, and relay DTCs. Diagnose the multiple DTCs within this category in numerical order. Begin with the lowest numbered DTC, unless the diagnostic table directs you otherwise.
    • System level DTCs, for example, misfire DTCs, fuel trim DTCs, and catalyst DTCs.
  5. 10 -  This step is for areas that have inspection and maintenance testing procedures for emissions testing. Use this step if the testing facility found one or more I/M SYSTEM STATUS that did not set.

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