Connect the NGS Tester to the DLC under the dash. Turn off accessories. If vehicle is equipped with an auxiliary powertrain control (rpm control), it must be turned off to perform self tests.

• Perform the necessary vehicle preparation and visual inspection. Refer to Quick Test Operation.
• Select VEHICLE & ENGINE SELECTION menu.
• SELECT NEW VEHICLE, YEAR & MODEL.
• Select DIAGNOSTIC DATA LINK.
• Select PCM-POWERTRAIN CONTROL MODULE.
• Select DIAGNOSTIC TEST MODE.
• Select KOEO ON DEMAND SELF TEST.
• Turn key on.
• Follow operating instructions from the menu.
• Record DTCs and follow appropriate pinpoint test.
• After test, cycle key to off before running other tests or driving vehicle.

If performing repeated self tests, it may be necessary to unplug glow plug relay to keep battery from going dead. Ignore DTC 0380 while glow plug relay is unplugged.

Note: If IDM trouble codes are retrieved, use the following special instructions required to clear IDM trouble codes (1995/1996 model year).

• Key on.
• Record IDM trouble codes stored in "KOEO ON DEMAND SELF TEST" and "KOEO INJECTOR ELECTRICAL SELF TEST" modes.
• Access "RETRIEVE/CLEAR CONTINUOUS DTCs" from NGS Tester menu to clear IDM trouble codes from memory.
• Record any codes displayed. (P1111 may be the only code displayed.)
• Push "CLEAR ALL" button on NGS Tester.
• IDM trouble codes are now cleared from memory. Repeat the KOEO On-Demand Self Test and KOEO Injector Electrical Self Test. Any IDM codes that reappear are IDM hard faults. If no IDM codes reappear, then the fault is an intermittent IDM fault.