DTC Advanced Diagnostics: P1A61
DTC P1A61 : TCM Internal Malfunction
General Description
The transmission control module (TCM) internal malfunction that leads to infringement of the vehicle safety defined by ISO26262, is detected by the self-diagnosis of the main CPU and the diagnosis by the sub CPU to secure safety before the vehicle reaches to a hazardous event. The monitoring of the arithmetic function is made by the self-diagnosis of the main CPU and the diagnosis of the sub CPU. If the arithmetic function is in abnormal condition for a specified time, the TCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 0.1 second or more |
| DTC Type | One drive cycle, MIL on, shift position indicator blinks |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
The arithmetic function is in abnormal condition for at least 0.1 second.
Possible Cause
- TCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on, the shift position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.