DTC Advanced Diagnostics: P1A62
DTC P1A62 : TCM Internal Control Module Acceleration Parameter Performance
General Description
Due to the malfunction of control between the transmission control module (TCM) and the powertrain control module (PCM), the requested values of extreme engine torque and extreme engine speed rise are output that may cause an unintended acceleration. The TCM performs the detection to secure safety before unintended acceleration occurs. If an extreme engine torque requested value is output from the TCM to the PCM when it is in torque cooperation controlled between the TCM and the PCM with low acceleration pedal position, or if an extreme engine speed rise requested value is output from the TCM to the PCM, the TCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 4 seconds or less |
| DTC Type | One drive cycle, MIL off, shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| Accelerator pedal position* | - | 5 % | |
| State of the engine | Running | ||
*: Engine torque request abnormal
Malfunction Threshold
One of these conditions is met for at least 4 seconds:
- An extreme engine torque requested value is output from the TCM to the PCM when it is in torque cooperation controlled between the TCM and the PCM with low acceleration pedal position.
- An extreme engine speed rise requested value is output from the TCM to the PCM.
Possible Cause
- TCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the shift position indicator blinks and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory. The MIL does not come on.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.