P0ACC

P310 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A9D: Hybrid Battery Temperature Sensor "A" Circuit Low

DTC P0A9D - Hybrid Battery Temperature Sensor "A" Circuit Low

DTC P0A9E - Hybrid Battery Temperature Sensor "A" Circuit High

DTC P0AC7 - Hybrid Battery Temperature Sensor "B" Circuit Low

DTC P0AC8 - Hybrid Battery Temperature Sensor "B" Circuit High

DTC P0ACC - Hybrid Battery Temperature Sensor "C" Circuit Low

DTC P0ACD - Hybrid Battery Temperature Sensor "C" Circuit High

DESCRIPTION
The battery temperature sensors are provided at 8 locations on the bottom of the HV battery. The resistance of the thermistor, which is built into each battery temperature sensor, varies in accordance with changes in the HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery smart unit uses the battery temperature sensor to detect the HV battery temperature, and sends the detected value to the HV control ECU. Based on the results of this detection, the HV control ECU controls the blower fan. (The blower fan starts when HV battery temperature rises to a predetermined level.)

HINT: After confirming that a DTC is output, use the Techstream to check "BATT TEMP1 to 8" in the HV control system ECU data list.

MONITOR DESCRIPTION

If the temperature indicated by the battery temperature sensor is lower than the standard level (open circuit), or is higher than the standard level (short circuit), 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, the HV control ECU illuminates the MIL and sets a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

WIRING DIAGRAM

INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
HINT: At least 5 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (DTC P0A1F IS OUTPUT)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Read output DTCs Hybrid Battery System.
Result:

B -- GO TO DTC CHART (P0A1F)
A -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (BATTERY TEMPERATURE SENSOR CONNECTOR)
NOTE: Be sure to wear insulated gloves and protective goggles.
(a) Remove the battery cover Components.

(b) Check the connections of the B31 and B32 connectors of the battery smart unit.
Result:

(c) check the connections of connectors between the battery temperature sensor (No. 0) and battery temperature sensor (No. 2).
Result:

NG -- CONNECT SECURELY
OK -- Continue to next step.
3. CHECK HV BATTERY (BATTERY TEMPERATURE SENSOR)
CAUTION: Be sure to wear insulated gloves and protective goggles.

(a) Disconnect the B31 and B32 connectors from the battery smart unit.
(b) Measure the resistance according to the conditions and value(s) in the tables below.

Standard resistance:

(c) Disconnect the B28 connector from the battery smart unit.
(d) Measure the resistance according to the conditions and value(s) in the tables below.
Standard resistance:

NG -- REPLACE HV BATTERY
OK -- Continue to next step.
4. INSPECT BATTERY SMART UNIT
(a) Connect the B28 battery smart unit connector.
(b) Turn the ignition switch to the ON position.

NOTE: Turning the ignition switch to the ON position with the service plug grip removed causes an interlock switch system DTC (P0A0D-350) to be set. Use the Techstream to clear the DTCs.
(d) Reconnect the battery smart unit connector.
NG -- INSPECT BATTERY SMART UNIT
OK -- REPLACE BATTERY SMART UNIT
5. INSPECT BATTERY SMART UNIT
(a) Disconnect the B27 battery current sensor connector from the HV relay assembly.
(b) Turn the ignition switch to the ON position.

NOTE: Turning the Ignition switch to the ON position with the HV relay assembly (battery current sensor) connector disconnected causes DTC P0AC2 to set. Use the Techstream to clear the DTCs.

NG -- CHECK BATTERY PACK WIRE (BATTERY SMART UNIT - BATTERY CURRENT SENSOR)
OK -- REPLACE HV RELAY ASSEMBLY
6. CHECK BATTERY PACK WIRE (BATTERY SMART UNIT - BATTERY CURRENT SENSOR)
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Disconnect the B28 connector from the battery smart unit.
(b) Disconnect the B27 HV relay assembly (battery current sensor) connector.

Standard resistance (Check for short):

NG -- REPLACE BATTERY PACK WIRE
OK -- REPLACE BATTERY SMART UNIT