U029A

P310 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: U029A-123: Lost Communication with Hybrid Battery Pack Sensor Module

DTC 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 the 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





WIRING DIAGRAM





INSPECTION PROCEDURE
CAUTION:
- If the battery cover is removed, install it before turning the power switch on (IG) or (READY). If the power switch is turned on (IG) or (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 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. INSPECT HYBRID VEHICLE CONTROL ECU





(a) Using an oscilloscope, measure the waveform according to the condition in the table below Components.






Standard:
The waveform in the illustration can be measured.
OK:
The waveform appears as shown in the illustration.
NG -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE)
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE)
(a) Disconnect the D36 connector from the hybrid vehicle control ECU.





(b) Disconnect the Oz2 connector shown in the illustration Components.





(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (BATTERY PACK WIRE)
(a) Connect the D36 connector to the hybrid vehicle control ECU.





(b) Measure the voltage according to the value(s) in the table below when the power switch is on (IG).
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT BATTERY PACK WIRE
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Remove the service plug grip.
(b) Remove the battery cover Components.
(c) Disconnect the z18 connector from the battery smart unit Components.





(d) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):






NG -- REPLACE BATTERY PACK WIRE
OK -- REPLACE BATTERY SMART UNIT