DTC No. P0AC8-00 Temperature Sensor 2 out of Upper range Diagnosis

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC set in memory for the item monitored below)

BMU monitor

Sensor (The sensor below is determined to be normal)

Not applicable

DTC SET CONDITIONS

Logic Flow Chart

Check Condition

The BMU power supply voltage is more than 7.578 volts.

Judgment Criterion

The input voltage of the battery module temperature sensor No. 2 is 4.84096 volts or more for 2 seconds or more when the temperature is -40° (-40°F) or less.

OBD-II DRIVE CYCLE PATTERN

Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.

TROUBLESHOOTING HINTS

Damaged wiring harness and connectors
Malfunction of the battery module temperature sensor No. 2
Malfunction of the BMU

DIAGNOSIS

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991223: Wiring harness set
MB992006: Extra fine probe

1.Check of continuity at drive battery connector (control wiring harness connector) (Battery module temperature sensor No. 2 shield line)

(1) Disconnect the connector, and measure at the wiring harness side.

(2) Check the following for continuity.

Continuity between the drive battery connector (control wiring harness connector) (terminal No. 23) and body ground

OK: Continuity exists (2 Ω or less)

Is the check result normal?

Repair the connector(s) or wiring harness. Then,

2.Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE

(2) Check the DTC.

Is the DTC set?

The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS

3.Drive battery control wiring harness check (Battery module temperature sensor No. 2 signal line)

(1) Disassemble the drive battery (Refer to SERVICE PROCEDURE

(2) Check the following wiring harness for open circuit.

Between the battery module temperature sensor No. 2 connector (terminal No. 2) and BMU connector (terminal No. 36)

Is the check result normal?

Repair the connector(s) or wiring harness. Then,

4.Drive battery control wiring harness check (Battery module temperature sensor No. 2 signal line)

Check the following wiring harness and connectors for damage.

Between the battery module temperature sensor No. 2 connector (terminal No. 2) and BMU connector (terminal No. 36)

Is the check result normal?

Repair the connector(s) or wiring harness. Then,

5.Drive battery control wiring harness check (Battery module temperature sensor No. 2 ground line)

Check the following wiring harness for open circuit.

Between the battery module temperature sensor No. 2 connector (terminal No. 1) and BMU connector (terminal No. 32)

Is the check result normal?

Repair the connector(s) or wiring harness. Then,

6.Drive battery control wiring harness check (Battery module temperature sensor No. 2 shield line)

Check the following wiring harness for open circuit.

Between the battery module temperature sensor No. 2 connector (terminal No. 3) and drive battery connector (control wiring harness connector) (terminal No. 23)

Is the check result normal?

Repair the connector(s) or wiring harness. Then,

7.Battery module temperature sensor No. 2 check

Check the battery module temperature sensor No. 2 (Refer to BATTERY TEMPERATURE SENSOR CHECK

Is the check result normal?

Replace the BMU (Refer to BATTERY MANAGEMENT UNIT (BMU) REMOVAL AND INSTALLATION

). Then,

Replace the battery module temperature sensor No. 2 (Refer to SERVICE PROCEDURE

). Then,

8.Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE

(2) Check the DTC.

Is the DTC set?

Retry the troubleshooting.

The procedure is complete.