DESCRIPTION
- The hybrid vehicle control ECU alerts the driver and performs fail safe control based on error signals sent from the battery smart unit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0A1F-123 | Reception of an error signal from the battery smart unit | Battery smart unit Auxiliary battery Wire harness or connector IGCT NO. 3 fuse |
MONITOR DESCRIPTION
If the battery smart unit detects an internal malfunction in the unit itself, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
The battery smart unit calculates the resistance of the HV battery through amperage and voltage, and uses this resistance to determine the extent of deterioration of the HV battery. If the battery smart unit detects that the resistance of the HV battery has exceeded the standard, it determines that a malfunction has occurred. In addition, the battery smart unit monitors the SOC, and if the difference between the maximum and minimum SOC values exceeds the standard, it determines that a malfunction has occurred. When either of the malfunction detection conditions is met, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
The battery smart unit, which monitors the voltage of the battery blocks, determines that a malfunction has occurred if a voltage difference between the battery blocks exceeds the standard. When the malfunction detection condition is satisfied, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
- Refer to the description for DTC P0A84-123 . Refer to «DESCRIPTION»(ref-387122-S19042677362011022400000) .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0A82-123 | Battery blower assembly speed is not within the specified range calculated by the hybrid vehicle control ECU. (1 trip detection) Difference between the actual battery temperature and the battery temperature estimated based on cooling capacity of the battery blower assembly. (2 trip detection) | Battery cooling blower assembly Battery smart unit HV battery intake duct Wire harness or connector Hybrid vehicle control ECU |
Refer to the description for DTC P0A84-123. Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0A85-123 | When the output voltage of the battery cooling blower assembly (VM) is not within the target control voltage range (1 trip detection) | Wire harness or connector Battery cooling blower assembly Battery smart unit HV battery |
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0A95-123 | Voltage between VBB11 and VBB12 terminals is below the standard despite the interlock switch being engaged (1 trip detection) | Electric vehicle fuse Service plug grip HV battery |
Scheme 773
Refer to the description for DTC P0A9D-123 . Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0A9C-123 | When the battery temperature sensor performance is abnormal (1 trip detection/2 trip detection) | HV battery (Battery temperature sensor) Battery smart unit |
If the temperature indicated by the battery temperature sensor is lower than the standard level (open), or is higher than the standard level (short), the battery smart unit interprets this as a sensor malfunction. If the battery smart unit detects that HV battery temperature is out of a normal range or its value is abnormal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
If the temperature indicated by the battery temperature sensor is lower than the standard level (open), or is higher than the standard level (short), the battery smart unit interprets this as a sensor malfunction. If the battery smart unit detects that HV battery temperature is out of a normal range or its value is abnormal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
- The intake air temperature sensor (battery) is mounted on the HV battery. The resistance of the sensor varies in accordance with changes in the intake air temperature. The characteristics of the intake air temperature sensor are the same as those of the battery temperature sensor. Refer to «DTC P0A9D-123: Hybrid Battery Temperature Sensor "A" Circuit Low; DTC P0A9E-123: Hybrid Battery Temperature Sensor "A" Circuit High»(ref-387122-S02648377372011022400000) The battery smart unit uses signals from the intake air temperature sensor to control the air volume of the battery cooling blower assembly.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0AAC-123 | When the temperature indicated by the intake air temperature sensor is lower than a predetermined limit (open circuit) or is higher than a predetermined limit (short circuit) | HV battery (Intake air temperature sensor) HV battery (Battery temperature sensor) Battery smart unit |
HINT
After confirming that DTC P0AAC is output, use the Techstream to check "Inhaling Air Temp" in the HV ECU data list.
| Displayed Temperature | Malfunction |
|---|---|
| 45°C (-49°F) or less | Open or +B short circuit |
| 95°C (203°F) or higher | GND short |
Scheme 774
Refer to the wiring diagram for DTC P0A1F-123. Refer to WIRING DIAGRAM , DTC P0A9D-123. Refer to WIRING DIAGRAM .
If the battery smart unit detects a malfunction in the battery current sensor, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
Refer to the circuit description for DTC P0ABF-123. Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0AC0-123 | When the battery current sensor is abnormal (1 trip detection/2 trip detection) | HV relay assembly (battery current sensor) Battery smart unit |
If the battery smart unit detects a malfunction in the battery current sensor, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
- Refer to the circuit description for DTC P0A80-123. Refer to «DESCRIPTION»(ref-387122-S07082448092011022400000) .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0AFA-123 | Any of the battery block voltages become less than 2.0 V (open). (1 trip detection) | Battery smart unit HV battery |
HINT
Values below 2.0 V may not be indicated in the data list due to the substitution of a fail-safe value.
The battery smart unit monitors a voltage of the battery blocks to detect an open malfunction in internal battery voltage sensor circuits of the battery smart unit and the wire harness between each battery block and battery smart unit. If a voltage at one of the battery blocks is below a standard level or of all the battery blocks is within a specified range, the battery smart unit judges that there is an open in the internal sensor circuit(s) or wire harness. The hybrid vehicle control ECU will then illuminate the MIL and set a DTC.
- Refer to the circuit description for DTC P0A80-123 . Refer to «DESCRIPTION»(ref-387122-S07082448092011022400000) .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P3011-123 P3012-123 P3013-123 P3014-123 P3015-123 P3016-123 P3017-123 P3018-123 P3019-123 P3020-123 P3021-123 P3022-123 P3023-123 P3024-123 P3025-123 P3026-123 P3027-123 P3028-123 P3029-123 | Presence of a malfunctioning block is determined based on each battery block voltage (1 trip detection). | HV battery Battery smart unit |
HINT
DTCs from P3011-123 to P3029-123 cannot be set unless the vehicle is driven for approximately 10 minutes after clearing the DTCs.
If there is an abnormal internal resistance or electromotive voltage in the battery blocks, the battery smart unit determines that a malfunction has occurred. When the malfunction detection condition is satisfied, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
The battery smart unit detects the HV battery conditions (voltage, current, and temperature) and the battery cooling fan voltages, and sends the detected information to the hybrid vehicle control ECU via serial communication.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U029A-123 | Problem with serial communication between the battery smart unit and hybrid vehicle control ECU (1 trip) | Wire harness or connector Hybrid vehicle control ECU Battery smart unit IGCT NO. 3 fuse |