Durango 4WD V8-5.7L Hybrid (2009)
The maximum and minimum temperatures from the six thermistors can be read using the scan tool. You cannot read all six temperatures or determine
which sensor is the maximum or minimum reading. If a sensor fails, a DTC is set. Follow the proper service procedures.
The thermistors must be replaced as an assembly with all of the thermistors and harness to the BPCM. This harness also includes the connector to the
battery current sensor.
VENT TUBES
During heavy charging or discharging conditions, the battery modules may vent hydrogen gas because of high battery temperature. This off-gassing is
captured through two battery vent tubes connected to vent ports on each module. The two tubes are connected together with a "T" fitting that is vented to
the atmosphere under the vehicle.
This vent tube is separate from the cooling air intake and exhaust vents.
During normal operation there should be no off-gassing of hydrogen.
CURRENT SENSOR
An inductive current sensor measures current flow in the HV battery. This sensor locates between the positive contactor and the positive post of the HV
battery. This sensor is similar to an amp clamp that can be used with a Digital Voltmeter (DVOM).
The current sensor is an input to the BPCM and is used by the HCP. The BPCM uses the current sensor to verify pre-charge operation during battery
connection. The signal is used by the BPCM to check for welded contactors when the battery is commanded to disconnect the HV system.
The current sensor data can be read by the scan tool through the BPCM menu. This indicates current flow between the HV battery and the rest of the HV
system. If the battery current is flowing to the TPIM and the rest of the HV system, the current displays as a positive reading. If the HV battery is being
charged from the HV system, the current displays as a negative reading.
Under typical operating conditions, the current level ranges up to 200 Amps of positive or negative current flow. If the current exceeds 250 Amps, the
HCP reduces HV battery usage.
The HCP uses the current signal in drivetrain management and checks for Loss of Isolation (LOI) testing.
