P0A1F-123 - Battery Energy Control Module

HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A1F-123: Battery Energy Control Module
P0A1F-123 - Battery Energy Control Module

DESCRIPTION

- If the battery smart unit detects an internal malfunction, it sends an error signal to the hybrid vehicle control ECU. When the hybrid vehicle control ECU receives the error signal from the battery smart unit, the ECU warns the driver and performs fail-safe control.

MONITOR DESCRIPTION

If the battery smart unit detects an internal malfunction in itself, 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.

HINT
After repairing, restart the system (turn the power switch on (READY)) and recheck for DTCs Hybrid Battery System.

PROCEDURE

1. CHECK AUXILIARY BATTERY

(a) Measure the voltage between the terminals of the auxiliary battery.

Standard voltage:

11 to 14 V

NG -- CHARGE OR REPLACE AUXILIARY BATTERY
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE)

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.

(d) Disconnect the z15 connector from the battery smart unit.

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

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

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

Standard Voltage:

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.
- Turning the power switch on (IG) with the service plug grip removed causes DTCs to be set. Use the Techstream to clear the DTCs.

Text in Illustration

(h) Turn the power switch off.

(i) Connect the z15 connector to the battery smart unit

(j) Install the hybrid battery junction block assembly.

NG -- CHECK FUSE (IGCT, IGCT NO. 2)

OK -- REPLACE BATTERY SMART UNIT Components

3. CHECK FUSE (IGCT, IGCT NO. 2)

(a) Turn the power switch off.

(b) Remove the IGCT and IGCT No. 2 fuses from the engine room junction block assembly.

Text in Illustration

(d) Install the IGCT and IGCT No. 2 fuses to the engine room junction block assembly.

NG -- REPLACE FUSE (IGCT, IGCT NO. 2)
OK -- Continue to next step.

4. CHECK RELAY (IGCT)

(a) Turn the power switch off.

(b) Remove the IGCT relay from the engine room junction block assembly.

Text in Illustration

Standard Resistance:

(d) Install the IGCT relay to the engine room junction block assembly.

NG -- REPLACE RELAY (IGCT)
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (IGCT RELAY - BATTERY SMART UNIT)

CAUTION:
Be sure to wear insulated gloves.

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

(b) Remove the IGCT relay from the engine room junction block assembly.

Text in Illustration

(c) 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.

(d) Remove the hybrid battery junction block assembly.

(e) Disconnect only the z15 connector of the battery smart unit.

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

Standard Resistance:

Text in Illustration

(g) Connect the z15 connector of the battery smart unit.

(h) Install the hybrid battery junction block assembly.

(i) Install the IGCT relay to the engine room junction block assembly.

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- CHECK AND REPAIR POWER SOURCE CIRCUIT