Hybrid Battery System (Diagnostics - Introduction): Other — Hybrid Battery System (Diagnostics - Introduction) — Engine Control Systems

Hybrid Battery System (Diagnostics - Introduction): Other Toyota Prius C I facelift

DEFINITION OF TERMS [12/2013 - ]

Terms	Definition
Monitor Description	Description of what the power management control ECU monitors and how to detects malfunctions (monitoring purpose and its details).
Related DTCs	A group of diagnostic trouble codes that are output by the power management control ECU based on the same malfunction detection logic.
Typical Enabling Condition	Preconditions that allow the power management control ECU to detect malfunctions. With all preconditions satisfied, the power management control ECU sets DTCs when the monitored value(s) exceeds malfunction threshold(s).
Sequence of Operation	Order of monitor priority, applied if multiple sensors and components are involved in a single malfunction detection process. Each sensor and component are monitored in turn and subsequent items are not monitored until the previous detection operation completes.
Required Sensor/Components	Sensors and components used by the power management control ECU to detect each malfunction.
Frequency of Operation	Number of times the power management control ECU checks for each malfunction during each driving cycle. "Once per driving cycle" means that the power management control ECU only checks for malfunctions once during a single driving cycle. "Continuous" means that the power management control ECU checks for malfunctions whenever enabling conditions are met.
Duration	Minimum time for which the power management control ECU must detect continuous deviation in monitored value(s) in order to set a DTC. Timing begins when typical enabling conditions are met.
Malfunction Thresholds	Value beyond which the power management control ECU determines malfunctions exist and sets DTCs.
MIL Operation	Timing of MIL illumination after a malfunction is detected. "Immediate" means that the power management control ECU illuminates the MIL as soon as a malfunction is detected. "2 driving cycles" means that the power management control ECU illuminates the MIL if the same malfunction is detected again during the next driving cycle.

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Scheme 220: ILLUSTRATION

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Scheme 221: ILLUSTRATION

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Scheme 222: SYSTEM DIAGRAM [12/2013 - ]

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Scheme 225: SYSTEM DESCRIPTION [12/2013 - ]

BATTERY SMART UNIT CONTROL The battery smart unit converts the HV battery condition signals (voltage, current, and temperature), which are needed to determine the charging or discharging values that are calculated by the power management control ECU into digital signals, and transmits them to the power management control ECU via serial communication. A leakage detection circuit is provided in the battery smart unit in order to detect any leakage from the HV battery. Furthermore, the battery smart unit detects the voltage of the cooling fan, which is needed by the power management control ECU to effect cooling fan control. The battery smart unit also converts these signals into digital signals and transmits them to the power management control ECU via serial communication.

CHECK FOR INTERMITTENT PROBLEMS [12/2013 - ]

CHECK FOR INTERMITTENT PROBLEMS Perform a simulation test. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ]»(ref-651169-S20338414212014081900000) . For the simulation test, reproduce the driving conditions that were present when the trouble occurred. These conditions should be based on the customer's comments and freeze frame data that is recorded with DTCs, such as the opening angle of the accelerator pedal, SOC (state of charge), engine coolant temperature, engine RPM, and MG1/MG2 RPM and torque. Check the connector(s) and terminal(s). Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE [12/2013 - ]»(ref-651169-S28982231602014081900000) . Wiggle the harness and connector(s). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ]»(ref-651169-S20338414212014081900000) . Heat or cool suspected parts. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ]»(ref-651169-S20338414212014081900000) .

FREEZE FRAME DATA [12/2013 - ]

FREEZE FRAME DATA HINT: The power management control ECU records vehicle and driving condition information as freeze frame data the moment a DTC is stored. It can be used for estimating or duplicating the vehicle conditions that were present when the malfunction occurred. To confirm the details of the hybrid control system, check the detailed information for the DTC information code in the Data List (INF code). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. Select a DTC in order to display its freeze frame data. Check the freeze frame information recorded with the DTC. HINT: For the freeze frame data chart. Refer to «INFORMATION / FREEZE FRAME DATA [12/2013 - ]»(ref-651326-S10752234802014081900000) .