How to Troubleshoot the CVT System (CVT): Self-Diagnosis

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If the TCM or the PCM detects the failure of a signal from a sensor, a switch, a solenoid valve, or from another control unit, it stores a Pending or Confirmed DTC. Depending on the failure, a DTC is stored in either the first or second drive cycle. When a Confirmed DTC is stored, the TCM or the PCM blinks the shift position indicator and/or turns on the MIL by a signal sent to the gauge control module via F-CAN.

One Drive Cycle Detection Method:
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 stores a Pending or Confirmed DTC for the failure and blinks the shift position indicator and/or turns on the MIL immediately.
Two Drive Cycle Detection Method:
When an abnormality occurs in the signal from a sensor, a switch, a solenoid valve, or from another control unit in the first drive cycle, the TCM or the PCM stores a Pending DTC. The shift position indicator and the MIL do not turns on at this time. If the failure continues in the second drive cycle, the TCM or the PCM stores a Confirmed DTC and blinks the shift position indicator and/or turns on the MIL.