U029A

P313 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: U029A-123: Lost Communication with Hybrid Battery Pack Sensor Module
U029A-123 - Lost Communication with Hybrid Battery Pack Sensor Module

DESCRIPTION

The battery smart unit detects the HV battery conditions (voltage, current, and temperature) and the battery cooling fan voltage, and sends the detected signals to the hybrid vehicle control ECU via the serial communication system.





MONITOR DESCRIPTION

If a malfunction in communication line between the battery smart unit and hybrid vehicle control ECU is detected, the hybrid vehicle control ECU illuminates the MIL and sets a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4. Turn the ignition switch off.

5. Turn the ignition switch to ON (READY) and after a few seconds, turn the ignition switch off. [A]

6. Repeat [A] 3 times. [B]

7. Turn the ignition switch to ON and turn the Techstream on.

8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [C]

9. Check that permanent DTCs are cleared.

10. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AFC-123 P0AFC-123.

INSPECTION PROCEDURE

CAUTION:
* If the battery cover is removed, install it before turning the ignition switch ON or ON (READY). If the ignition switch is turned ON or ON (READY) with the battery cover removed, U029A-123 may be set.
* 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. INSPECT FUSE (IGCT NO. 3) P0AFC-123

NG -- REPLACE FUSE (IGCT NO. 3)
OK -- Continue to next step.

2. INSPECT RELAY (IGCT MAIN) P0AFC-123

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

3. CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE) P0AFC-123

NG -- CHECK HARNESS AND CONNECTOR (NO. 2 BATTERY PACK WIRE)
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY SMART UNIT)

CAUTION:
Be sure to wear insulated gloves and protective goggles.

(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 ignition switch ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the battery cover Removal.

(d) Disconnect the D72 connector from the hybrid vehicle control ECU Removal.

(e) Disconnect the z21 connector from the battery smart unit.

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





Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





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

(h) Turn the ignition switch to ON.

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

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

Standard Voltage:





NOTICE:
* If the ignition switch is turned ON with the service plug grip removed, DTC P0A0D-350 for the interlock switch system will be stored. If this DTC is output, clear the DTC using the Techstream Hybrid Battery System.
* If the ignition switch is turned ON with the connector removed from the sensor, DTC will be stored. If DTC is output, clear the DTC using the Techstream Hybrid Battery System.

NG -- CHECK HARNESS AND CONNECTOR (NO. 2 BATTERY PACK WIRE)
OK -- Continue to next step.

5. CHECK WAVEFORM

CAUTION:
Be sure to wear insulated gloves and protective goggles.

(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 ignition switch ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the battery cover Removal.

(d) Remove the battery smart unit Removal.

HINT
Do not disconnect the battery smart unit connector.

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

(f) Connect an oscilloscope between the battery smart unit terminals specified in the table below, and measure the waveform.









OK:

The waveform in the illustration can be measured.

NOTICE:
* After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the repair manual because this may cause a malfunction.
* If the ignition switch is turned ON (IG) with the service plug grip removed, DTC P0A0D-350 for the interlock switch system will be stored. If this DTC is output, clear the DTC using the Techstream Hybrid Battery System.

Text in Illustration





NG -- REPLACE BATTERY SMART UNIT Removal

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Removal

6. CHECK HARNESS AND CONNECTOR (NO. 2 BATTERY PACK WIRE) P0AFC-123

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 BATTERY PACK WIRE)
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (IGCT MAIN RELAY - BATTERY SMART UNIT) P0AFC-123

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- CHECK AND REPAIR POWER SOURCE CIRCUIT

8. CHECK HARNESS AND CONNECTOR (NO. 2 BATTERY PACK WIRE)

CAUTION:
Be sure to wear insulated gloves and protective goggles.

(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 ignition switch ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(c) Remove the battery cover Removal.

(d) Disconnect the Oz3 connector from the No. 2 battery pack wire.





(e) Disconnect the z21 connector from the battery smart unit.

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





Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 BATTERY PACK WIRE)

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR