DTC P1432 (73): Battery Cell Overheating: General Description
There are 120 cells connected in series in the high voltage battery for the IMA (integrated motor assist) system, and every cell has a positive temperature coefficient (PTC) element. Serially connected cells enable the BCM (battery condition monitor) module to detect a change in resistance (PTC+ side to ground, the BCM module detected voltage) when one or more monitoring cells' temperature is beyond a set value. Consequently, overheating is detected even if only one cell is malfunctioning. If the BCM module detected voltage is a set value or more for a specified time, a malfunction in the battery is detected and a DTC is stored.
NOTE:
The PTC element has characteristics as shown in the graph (the resistance increases at a faster rate within a certain range), so it is used to detect that a monitored object temperature is beyond a specified value.
MONITOR DESCRIPTION CHART
| Execution | Continuous |
| Sequence | Battery cell temperature signal circuit, BCM |
| Duration | 2 seconds or more |
| DTC Type | One drive cycle, MIL ON, IMA system indicator ON |
ENABLE CONDITIONS CHART
| Condition | Minimum | Maximum |
|---|---|---|
| BCM module power-supply voltage | 7.5 V | - |
| No active DTCs | MPI, Motor current sensor, Battery module, Battery module temperature sensor, MCM, MDM, Motor operation system, Bypass contactor, Motor commutation sensor, MDM voltage sensor, Battery current sensor, MPI module current sensor, MDM current sensor, BCM | |