P0AC2

HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0ABF-123, P0AC1-123, P0AC2-123: Hybrid Battery Pack Current Sensor Circuit
P0AC2-123 - Hybrid Battery Pack Current Sensor "A" Circuit High

DESCRIPTION

- The battery current sensor, which is mounted on the positive cable side of the HV battery assembly, detects the amperage that flows into the HV battery. The battery smart unit inputs a voltage, which varies between 0 and 5 V in proportion to the amperage, into the IB terminal from the battery current sensor. An output voltage of the battery current sensor below 2.5 V indicates that the HV battery is being discharged, and above 2.5 V indicates that the HV battery is being charged. The hybrid vehicle control ECU determines the charging and discharging amperage of the HV battery based on the signals that are input to its IB terminal from the battery smart unit, and calculates the SOC (state of charge) of the HV battery through the accumulated amperage.

MONITOR DESCRIPTION

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.

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 10 minutes before touching any of the high-voltage connectors or terminals.
HINT
At least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (DTC P0A1F-123 IS OUTPUT) P0A7F

B -- GO TO DTC CHART P0A1F
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HYBRID BATTERY JUNCTION BLOCK ASSEMBLY - BATTERY SMART UNIT)

NOTICE:
Be sure to wear insulated gloves.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Disconnect the battery current sensor connector from the hybrid battery junction block assembly.

(d) Disconnect only the z37 connector of the battery smart unit.

(e) Measure the resistance according to the value(s) in the tables below.

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

Text in Illustration

(f) Connect the z37 connector to the battery smart unit.

(g) Connect the battery current sensor connector to the hybrid battery junction block assembly.

(h) Connect the cable to the negative (-) battery terminal.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK BATTERY SMART UNIT (VIB VOLTAGE)

NOTICE:
Be sure to wear insulated gloves.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the hybrid battery junction block assembly Removal.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the power switch on (IG).

NOTICE:
If the power switch is turned on (IG) with the service plug grip removed, DTCs will be stored. If DTCs are output, clear the DTCs using the Techstream

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

(g) Turn the power switch off.

(h) Disconnect the cable from the negative (-) battery terminal.

(i) Install the hybrid battery junction block assembly Installation.

(j) Connect the cable to the negative (-) battery terminal.

NG -- REPLACE BATTERY SMART UNIT Components
OK -- Continue to next step.

4. CHECK BATTERY SMART UNIT

CAUTION:
Be sure to wear insulated gloves.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the hybrid battery junction block assembly Removal.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the power switch on (IG).

NOTICE:
If the power switch is turned on (IG) with the service plug grip removed, DTCs will be stored. If DTCs are output, clear the DTCs using the Techstream

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration