P0A1F-129 - Battery Energy Control Module

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0A1F-129: Battery Energy Control Module
P0A1F-129 - Battery Energy Control Module

DESCRIPTION

The battery smart unit (battery energy control module) sends HV battery voltage information to the hybrid vehicle control ECU via serial communication.





MONITOR DESCRIPTION

The hybrid vehicle control ECU calculates the differences between the received HV battery voltage, boost converter voltage, and inverter voltage. If any of the differences exceed prescribed values, the hybrid vehicle control ECU determines that there is a malfunction in the battery smart unit circuit. When the hybrid vehicle control ECU detects this malfunction, it will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





INSPECTION PROCEDURE

NOTICE:
Performing the check procedures for a long time with neutral (N) selected may cause DTC P3000-388 to be set.

HINT
If, after performing troubleshooting, it is necessary to replace the battery smart unit, voltages need to be confirmed after installing the new battery smart unit. To confirm normal operation, compare the HV battery voltage (PWR RESOURCE VB), pre-boost voltage (VL), and post-boost voltage (VH) in the Data List with the power switch on (READY) and neutral (N) selected. When the system is normal, the PWR RESOURCE VB, VL, and VH values should be almost equal (voltage boosting will not occur when neutral (N) is selected). If the difference between each voltage exceeds the values specified below, there is a malfunction in the battery smart unit.





PROCEDURE

1. CHECK DTC OUTPUT (HV)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check if DTCs are output.

Result:









HINT
P0A1F-129 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

(e) Turn the power switch off.

B -- GO TO DTC CHART Hybrid Control System
A -- Continue to next step.

2. CHECK DTC OUTPUT (HV)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check if DTCs are output.

Result:





(e) Turn the power switch off.

B -- GO TO DTC CHART

A -- REPLACE BATTERY SMART UNIT Components