Normal Operation
With the ignition switch in the ON position and the engine ON or OFF, the TBCM has serial communication over the controller area network (CAN) from the DLC using the WDS, VCM, or equivalent diagnostic tool with the appropriate adapter cable.
Note. The fans may continue running for approximately 15 seconds after the ignition switch is turned to the OFF position. Once the fans turn off, they do not start again until the ignition switch is cycled to the ON position.
With the ignition switch in the ON position and the engine running, the HVTB has 2 internal cooling fans that circulate climate-controlled air through the HVTB.
With the engine running and the audio unit ON (the audio unit MUST be original equipment manufactured (OEM), there should be minimal interference audible from the speakers (compare to a similar vehicle).
With the ignition switch in the ON position and the engine ON or OFF, the vehicle climate control system is used to maintain a specific temperature range of the high voltage traction battery (HVTB). There are 2 internal fans in the HVTB that circulate climate controlled air within the HVTB so it can maintain a specific temperature range. A battery compartment thermistor is hardwired to the HVTB for the battery compartment temperature input. The HVTB also monitors the battery compartment mode door actuator in order to determine in which direction the HVTB will operate the battery mode door motor. The battery mode door controls whether the air flowing into the battery compartment is fresh air or recirculated air. A battery thermal expansion solenoid valve also controls the refrigerant pressure, thereby controlling the air temperature. The ideal temperature for the HVTB is 28°C (82°F) with a desired range of 25°C (77°F) to 38°C (100°F). The DTC window is -40°C (-40°F) to 57°C (135°F). If the HVTB temperature varies from this DTC window range, a DTC may be flagged. Also, a failure of any of the internal HVTB climate control components/circuitry causes a DTC to be flagged.
With the ignition switch in the ON position and the engine ON or OFF (the engine must have started at least once after the ignition switch was cycled to ON), 2 internal fans to the high voltage traction battery (HVTB) circulate climate controlled air within the HVTB so it can maintain a specific temperature range. A failure of the cooling fan(s) or their associated circuits causes one (or both) of the DTCs to be flagged.
With the ignition switch in the ON position and the engine ON or OFF (the engine must have started at least once after the ignition switch was cycled to ON), the planetary gear set in the electronically controlled continuously variable transmission (eCVT) will engage the generator (also in the eCVT), which charges the high voltage traction battery (HVTB) and supplies high voltage to the DC/DC converter. The DC/DC converter steps the voltage down to 12 volts (operating range of 13.35 - 16 volts). The DC/DC converter charges the low voltage battery which is used to power the vehicle interior components and the PCM.
With the engine running, the battery power off (BPO) may be triggered either by the inertia switch(es) opening, a high voltage interlock circuit opening, the electrical interlock (EL I) circuit opening (fuse protected by the battery junction box [BJB] fuse 5 [5A]), or if the contactor box within the TBCM requests a BPO mode. If the inertia switch(es) opens and causes the BPO mode to occur, no DTCs are flagged. Also, if the inertia switch(es) are open, a power reset indicator in the instrument cluster illuminates.
With the ignition switch in the ON position and the engine ON or OFF (the engine must have run at least once after the ignition switch was cycled to ON), the traction battery control module (TBCM) monitors the contactors continuously. During a power down (key OFF) sequence, one or both of the contactors may set this DTC.
With the ignition switch in the ON position and the engine ON or OFF (the engine must have run at least once after the ignition switch was cycled to ON), the TBCM monitors the electrical isolation (leakage resistance) between the high voltage system and the vehicle chassis. A resistance value of less than 190,000 ohms (for 10 seconds or greater) is a failure. The normal resistance value is between 950,000 - 1,330,000 ohms. DTC P0AA6 is flagged if the traction battery control module (TBCM) detects a high voltage leakage of less than 190,000 ohms for 10 seconds or greater. If the TBCM detects a high voltage leakage of less than 66,000 ohms (with no time frame) the vehicle is not allowed to re-start.
With the ignition switch in the ON position and the engine ON or OFF (the engine must have run at least once after the ignition switch was cycled to ON), the traction battery control module (TBCM) monitors the current, voltage, temperature, and leakage resistance of the 25 individual nickel metal hydride battery modules within the high voltage traction battery (HVTB). The TBCM also controls the contactors. DTC P0A1F is flagged if there are any internal errors of the HVTB caused by sensor failure, control module failure, or other severe related faults internal to the HVTB.
The TBCM monitors the high voltage traction battery (HVTB) state of charge when the ignition switch is in the ON or OFF positions. The DTC P0A7D can only be set when the ignition switch is first turned to the ON position, or when the ignition switch is in the START position. This condition may occur if the vehicle has been stored for an extended period of time.
Note. If the jump start switch is pressed and held for longer than 6 seconds, the jump start process aborts. The LED flashes for approximately 2 minutes before another jump start can be attempted. The jump start switch needs to be pressed only momentarily.
When the jump start button is momentarily pressed, the jump start control module within the high voltage traction battery (HVTB) uses the low voltage battery during a 10-minute process (8-minute charge plus 2 minutes rest) to step up the low voltage in an effort to charge the high voltage battery to the point where it may start the engine. With the high voltage battery state of charge at 40%, the vehicle can be driven.
At all times, the traction battery control module (TBCM) monitors the ignition run/start input circuit. If there is no voltage detected on this circuit to the TBCM with the ignition switch in the ON position and the engine ON or OFF, DTC P2533 is flagged.
When the ignition switch is turned to the ON position, the powertrain control module (PCM) sends a request to the traction battery control module (TBCM) over the controller area network (CAN) communication link to close the high voltage traction battery (HVTB) contactors. If the PCM sends multiple requests (100 requests in 4 minutes or less) to the TBCM, DTC B1143 will be set in the TBCM.