Performing Self-Test

WARNING: This page is about a different variant/trim than selected.

To perform self-test, turn ignition off. Ensure test equipment is properly attached. If vehicle is equipped with an auxiliary powertrain control system (RPM control), it must be turned off before performing self-test. Using NGS tester, perform the following steps:

Start engine and allow it to idle.
Select VEHICLE & ENGINE SELECTION menu.
Select VEHICLE, YEAR & MODEL.
Select DIAGNOSTIC DATA LINK.
Select PCM - POWERTRAIN CONTROL MODULE.
Select DIAGNOSTIC TEST MODE.
Select KOER SWITCH SELF-TEST.
Follow operating instructions from NGS tester menu. After pressing "Trigger" to start test, wait 5 seconds before running through driver-operated controls. Test may also take up to 5 minutes to complete.
After test has been completed, cycle ignition off before running other tests or driving vehicle.
On F650-750 with an Allison automatic transmission, shift from Neutral to Drive and back to Neutral to validate Neutral switch.
If vehicle is not equipped with speed control, ignore DTCs P0565-P0569.