The battery temperature sensor is incorporated into the
battery current sensor and it informs the engine-ECU of battery temperature via the Local Interconnect
Network (LIN).
In response to the signal, the engine-ECU controls charging and discharging.
TROUBLE JUDGEMENT
Check Condition
After 2 seconds since the ignition switch is turned "ON" or since the completion
of engine start.
Battery positive voltage is more than 10 V and is less than 16.5 V.
Judgement Criterion
For 2 seconds, the battery temperature information from battery temperature sensor
is abnormal.
FAIL-SAFE AND BACKUP FUNCTION
Prohibits alternator output suppression control against current consumers. (operates
as a normal alternator.)
PROBABLE CAUSES
Failed battery temperature sensor (battery current sensor)
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code.
Reconfirmation of diagnosis code.
Q.
Is diagnosis code set?
Go to Step 2.
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points, How to Cope with Intermittent Malfunctions).
STEP 2. Replace the battery current sensor.
After replacing the battery current sensor, reconfirm whether the diagnosis
code is set.