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System Tests: Notes

  1. This is an interactive functional test of a particular system. During testing, DRB-II provides instructions to technician. After task is performed, press ENTER key. A fault will be generated since technician has performed a requested action and tester had not seen any indication from diagnostic pins.
  2. Some tests, such as engine coolant temperature sensor, require longer periods before circuit is automatically faulted (depending on ambient temperature). If after performing SYSTEM TESTS, DRB-II is unable to detect a fault, NO FAULTS DETECTED will display.
  3. An alpha character may appear as a fault code prefix. The character displayed can indicate where fault was detected in the engine test sequence. Alpha prefixes display only during SYSTEM TESTS.
    • "A" (First Key Off)  - Ignition switch in OFF position.
    • "B" (Key On Before Fuel Pump Drops Out)  - Ignition in ON position. FUEL PUMP DROPS OUT refers ECU activating fuel pump relay and fuel pump. If the ECU does NOT detect a crank signal within seconds after ignition is turned on, it will automatically open ground circuit to fuel pump relay, disabling fuel pump.
    • "C" (Key On After Fuel Pump Drops Out)  - Ignition is in ON position after fuel pump relay has timed out (fuel pump off).
    • "D" (First Crank)  - The engine is cranking but not running.
    • "E" (First Engine Start)  - Engine idling.
    • "F" (Second Key Off Before Fuel Pump Drops Out)  - Ignition is in OFF position for the second time before fuel pump relay has timed out.
    • "G" (Second Key Off After Fuel Pump Drops Out)  - Ignition in OFF position for second time before fuel pump relay times out.
    • "H"  - Second Key On.
    • "I"  - Second Engine Start.
    • "J"  - Last Key Off.
    • "X" (ECU Defined Faults)  - Faults detected by ECU on-board diagnostics.
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