DTC Advanced Diagnostics: P1AF1 (3.0L Engine) (2025)
DTC P1AF1 : Input Power A Voltage Correlation Abnormality
General Description
The powertrain control module (PCM) compares the system voltage between the PCM and other control units. If the difference of system voltage between the PCM and other control units increases, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 5.0 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time after the vehicle condition is turned to the ON mode | 3 seconds | - |
| Engine speed [Engine Speed] | 500 RPM | - |
| Other | 24 volt battery charger is not connected. | |
[ ]: HDS Parameter
Malfunction Threshold
The difference of system voltage between the PCM and other control units is 2 V or more for at least 5.0 seconds.
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.
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.
Conditions for clearing the DTC
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, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.