DTC Advanced Diagnostics: P0602
DTC P0602 : Boot Mode (Programming Error)
General Description
The transmission control module (TCM) is equipped with an update program to update its control program. The programs in the CPU of the TCM are classified as a TCM program (update-capable program) and a program for the update function (non-updatable program). The program update only updates the TCM program. When the TCM power is turned off during an update, the power for the update function is lost, and the update process stops. When the program update is stopped before it is completed, the TCM stores a DTC that indicates the update is not finished.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1 second or less |
| DTC Type | One drive cycle, MIL off, Shift position indicator off |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
The TCM program update stops 1 second before it is finished.
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- TCM program unwritten
- TCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When the TCM program is not written in the TCM, a Pending DTC and a Confirmed DTC are stored in the TCM memory. The MIL does not come on and the shift position indicator does not blink.
Conditions for clearing the DTC
The Pending DTC and the Confirmed DTC are cleared when the TCM program update is completed.