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Home >> Jeep >> 1991 >> Cherokee Limited >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> DRB-II Test Functions >> DRB-II Diagnostic Mode
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DRB-II Diagnostic Mode

  1. In order to perform diagnostic tests using DRB-II, DRB-II must be in FUEL/IGN MENU. At FUEL/IGN MENU, fault codes and DRB-II test functions can be accessed.
  2. To reach FUEL/IGN MENU, ensure ignition is off. Connect DRB-II to engine diagnostic connector. Connector is located on left side of engine compartment, near SBEC-II. See Figure . Turn ignition switch to RUN position.
  3. Copyright information and diagnostic program version will appear on screen for a few seconds. After a few seconds DRB-II menu will appear. At DRB-II menu, press "4" (SELECT SYSTEM) key. Press ENTER key.
  4. At SELECT SYSTEM menu, press "1" (ENGINE) key. Press ENTER key. The DRB-II menu will appear indicating engine year, size, type of transmission and SBEC-II part number.
  5. After a few seconds AIR COND menu will appear. Press "1" (WITH A/C) or press "2" (WITHOUT A/C). Press ENTER key. The DRB-II display will change to ENGINE SYSTEMS menu. At ENGINE SYSTEMS menu, press "1" (FUEL/IGNITION) key. Press ENTER key.
  6. Display will change to FUEL/IGN MENU. At FUEL/IGN menu of engine diagnostic program, specific test functions programmed into DRB-II can be performed. Following DRB-II modes can be accessed: SYSTEM TEST, READ FAULTS, STATE DISPLAY, ACTUATOR TEST and ADJUSTMENTS.
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