Fail-Safe Function

When an abnormality occurs in the signal from a sensor, a switch, a solenoid valve, or from another control unit, the TCM or the PCM ignores that signal and substitutes a pre-programmed value for that signal to allow the automatic transmission to continue operating. This causes a DTC to be stored and the shift position indicator to blink and/or the MIL to come on. The transmission may not shift normally during fail-safe operation. Do not run the test-driving diagnosis when the MIL is ON, or the shift position indicator is blinking.