P0A9E

HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A9D-123: Hybrid Battery Temperature Sensor "A" Circuit Low

DTC P0A9D-123 - Hybrid Battery Temperature Sensor "A" Circuit Low

DTC P0A9E-123 - Hybrid Battery Temperature Sensor "A" Circuit High

DESCRIPTION
- The battery temperature sensors are provided at 4 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 HV battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery smart unit uses the battery temperature sensors to detect the HV battery temperature, and sends the detected values to the hybrid vehicle control ECU. Based on these results, the hybrid vehicle control ECU controls the blower fan and rear air conditioning. (The blower fan starts when the HV battery temperature rises above a predetermined level.)

HINT: After confirming that DTC P0A9D-123 and P0A9E-123 are output, use the intelligent tester or Techstream to check "Temp of Batt TB 1 to 4" in the hybrid control system data list.

MONITOR DESCRIPTION

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.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AAC-123 P0AAC.

INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. 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 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK FOR DTCS (DTC P0A1F-123 IS OUTPUT)
(a) Connect the intelligent tester or Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items:
(1) Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / HV ECU / DTC INFO / CURRENT CODES.
(2) Techstream - Select: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output.
Result:

B -- GO TO DTC CHART (P0A1F-123)
A -- Continue to next step.
2. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM
(a) Select the following menu items:
(1) Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / HV ECU / DATA LIST / BATT TEMP 1 to 4.
(2) Techstream - Select: Powertrain / Hybrid Control / Data List / Temp of Batt TB 1 to 4.
HINT: "Temp of Batt TB 1 to 4" in the Data List represents the battery temperature sensor 0 to 3.
(b) Read the data list.
HINT: Compare each of the 4 battery temperature sensor values to determine which battery temperature sensor (0 to 3) is malfunctioning.

NEXT -- Continue to next step.
3. CHECK CONNECTOR CONNECTION CONDITION (BATTERY SMART UNIT)
CAUTION: Be sure to wear insulated gloves.

(a) Check the connection of connector z37 of the battery smart unit.
OK:
The connector is connected securely and there are no contact problems.
HINT: For the removal and installation procedures related to the battery smart unit connector inspection, Components.

NG -- CONNECT SECURELY
OK -- Continue to next step.
4. CHECK CONNECTOR CONNECTION CONDITION (BATTERY TEMPERATURE SENSOR)

(a) Check the connection of the battery temperature sensor connector (intermediate connector).
OK:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
5. CHECK HV BATTERY (BATTERY TEMPERATURE SENSOR)
CAUTION: Be sure to wear insulated gloves.
(a) Disconnect connector z37 from the battery smart unit.
HINT: For the removal and installation procedures related to the battery smart unit connector inspection, Components.

(b) For the malfunctioning battery temperature sensor(s), measure the resistance according to the value(s) in the table below.
Standard resistance (Battery temperature sensor 0):

Standard resistance (Battery temperature sensor 1):

Standard resistance (Battery temperature sensor 2):

Standard resistance (Battery temperature sensor 3):

(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- CHECK HARNESS AND CONNECTOR (BATTERY SMART UNIT - INTAKE AIR TEMPERATURE SENSOR)
OK -- REPLACE BATTERY SMART UNIT
6. CHECK HARNESS AND CONNECTOR (BATTERY SMART UNIT - INTAKE AIR TEMPERATURE SENSOR)
(a) Disconnect the battery temperature sensor connector.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HV BATTERY