P0B09
DTC P0B09 (2.4L Hybrid)
Circuit Description
The auxiliary transmission fluid pump is an electrical device that is used with the auxiliary transmission fluid pump relay to maintain transmission fluid line pressure to the transmission during Engine Idle Off mode. The auxiliary transmission fluid pump attaches to the transmission side cover assembly. The auxiliary transmission fluid pump relay receives voltage through the battery positive voltage circuit. The starter generator control module (SGCM) controls the auxiliary pump by providing the ground path on the auxiliary pump relay control circuit. The SGCM monitors the auxiliary transmission fluid pump relay control circuit voltage.
When the SGCM detects a fault on the auxiliary transmission fluid pump relay control circuit, then DTC P0B09 sets. DTC P0B09 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0B09 Auxiliary Transmission Fluid Pump Positive Voltage Relay Control Circuit
Conditions for Running the DTC
The Hybrid Wake Up signal is ON.
Conditions for Setting the DTC
The SGCM detects an open, short to ground, or short to voltage on the auxiliary transmission fluid pump relay control circuit for 320 milliseconds.
Action Taken When the DTC Sets
* The SGCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
* The SGCM inhibits Auxiliary Transmission Fluid Pump operation.
* The SGCM inhibits Engine Idle Off mode.
* The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
* The ECM stores DTC P0B09 in ECM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the MIL/DTC
* The SGCM requests the ECM to turn OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
* A scan tool can clear the MIL/DTC.
* The ECM clears the DTC from ECM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
* The ECM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is OFF long enough in order to power down the ECM.
