P0AC0-123

P310 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0AC0-123: Hybrid Battery Pack Current Sensor Circuit Range / Performance

DTC P0AC0-123 - Hybrid Battery Pack Current Sensor Circuit Range / Performance

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 charged, and above 2.5 V indicates that the HV battery is being discharged. 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 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-123 IS OUTPUT)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Read output DTCs Hybrid Battery System.
Result:






B -- GO TO DTC CHART Diagnostic Trouble Code Descriptions (P0A1F-123)
A -- Continue to next step.
2. REPLACE HV RELAY ASSEMBLY
(a) Replace the HV relay assembly Components.
NEXT -- Continue to next step.
3. CLEAR DTC
(a) Install the battery cover.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(e) Clear DTCs and freeze frame data Hybrid Battery System.
(f) Perform a road test to charge and discharge the HV battery assembly.
HINT: Two trip detection logic is used. After the first road test, turn the power switch off and perform a road test again.

NEXT -- Continue to next step.
4. CHECK DTC OUTPUT (DTC IS NOT OUTPUT AGAIN)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Read output DTCs.
Result:






B -- REPLACE BATTERY SMART UNIT
A -- COMPLETED