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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
The hybrid/EV battery contains 5 high-voltage contactors and 2 transistors. The high-voltage contactors allow the high-voltage DC batteries to be connected to the vehicle or safely contain the high-voltage DC within the hybrid/EV battery assembly. The 5 high-voltage contactors are a main positive high-voltage contactor, main negative high-voltage contactor, charge positive high-voltage contactor, charge negative high-voltage contactor and multi-function high-voltage contactor. The 2 transistors are the precharge transistor and heater transistor. These contactors/transistors close and open in sequence and are controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high-voltage contactors/transistors. Earth is provided through the case earth.
The hybrid/EV battery pack coolant heater is mounted to the coolant inlet on the back side of the hybrid/EV battery contactor assembly. The hybrid/EV battery pack coolant heater uses a 360 V power source.
After the ignition is turned ON, the hybrid/EV battery pack coolant heater is commanded ON. The hybrid/EV powertrain control module 2 monitors the temperature change at the hybrid/EV battery pack coolant temperature sensor 1 to determine if the hybrid/EV battery pack coolant heater is functioning properly.
| • | The 12 V battery voltage is greater than or equal to 9 V. |
| • | The vehicle is not connected to an active AC source. |
| • | The hybrid/EV battery pack coolant temperature sensor 1 is less than 45°C (113°F). |
| • | The difference between the hybrid/EV battery pack coolant temperature sensor 1 and the hybrid/EV battery average cell temperature is less the 25°C (77°F) |
| • | Runs once per ignition cycle when propulsion system goes active. |
| • | None of the following DTCs are set; P1EC3, P1EC4, P1EC5, P0C44, P0C45, P1F18, P0C47, or U0111. |
The hybrid/EV powertrain control module 2 did not see the battery pack coolant temperature sensor 1 rise fast enough during the test period of one minute. The required increase in temperature is approximately 1°C (1.8°F) change for every 2 seconds.
| • | DTC P1EC6 is a type B DTC. |
| • | The hybrid/EV battery pack coolant heater will be disabled. |
DTC P1EC6 is a type B DTC.
P1EC6 will prevent battery heating and the vehicle will be unable to start in cold weather with battery temperatures below -25°C (-13°F).
Hybrid Cooling System Description and Operation
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
EL-48900 HEV Safety Kit
For equivalent regional tools, refer to Special Tools .
Danger: High voltage enabling and disabling shall be only performed by High Voltage Qualified Technicians. The procedures for high-voltage enabling/disabling can be found in the service instructions and must be strictly followed at all times. The usage of the Protocol High Voltage Disabling/Enabling is mandatory. The High-Voltage Qualified Technician is responsible for the adherence to the manufacturer's service instructions as well as current national legal regulations.
Failure to follow the procedures exactly as written may result in serious injury or death. Questions regarding training can be answered by your national training centre.Danger: Any hybrid/EV battery pack replacement shall be performed by High-Voltage Qualified Technicians only. The replacement procedure can be found in the service instruction and must be strictly followed at all times. The High-Voltage Qualified Technician is responsible for adherence to the manufacturer's service instructions as well as current national legal regulations. If the hybrid/EV battery pack needs to be replaced contact the Technical Assistance Centre for further instructions prior to removal of the battery pack.
Perform the Diagnostic Repair Verification after completing the repair.
| • | Control Module References for battery energy control module replacement and hybrid battery interface control modules 1-4, programming and set-up for the hybrid/EV battery pack replacement. |
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