6 Perform Key On Engine Off (KOEO) On-Demand Self Test

6. Perform KOEO On-Demand Self Test







Purpose:
To determine if the PCM has detected any fault conditions that would cause a hard start or no start condition.

NOTE: The IDM stores both historical and hard IDM fault codes. To retrieve IDM fault codes, you must run KOEO On-Demand Self Test or KOEO Injector Electrical Test. To ensure that the DTC is a hard fault, you must first clear Continuous DTCs (be sure to record all DTCs before clearing) even though IDM codes do not show up on the Continuous display. Rerun KOEO On-Demand Self Test, if an IDM DTC is set a hard fault has occurred.

Recommended Procedure:
Connect the NGS Tester to the Data Link Connector (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. Reading Diagnostic Trouble Codes
- SELECT CORRECT VEHICLE, YEAR and 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. P Code Charts
- After test, cycle key to off before running other tests or driving vehicle.

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

Possible Causes:
The most likely PCM detectable faults that will cause a no start or hard start condition are:
- CMP sensor inactive faults.
- IPR output circuit check fault.
- FDCS, CID and IDM ENABLE circuit faults.

Tools Required:
New Generation Star (NGS) Tester 007-00500 or equivalent