Code No. P1608: Battery Current Sensor System


FUNCTION



  • The battery current sensor supplies battery current to the engine-ECU via the Local Interconnect Network (LIN).
  • In response to the signal, the engine-ECU controls charging and discharging.

TROUBLE JUDGMENT


Check Condition
  • 2 seconds later after the ignition switch has been in ON position or just after the engine has started up.
  • Battery positive voltage is more than 10 V and is less than 16.5 V.
Judgment Criterion
  • The battery current that the battery current sensor senses remains abnormal for 2 seconds or more.

FAIL-SAFE AND BACKUP FUNCTION



  • Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)

PROBABLE CAUSES



  • Failed 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.

Q. Is the diagnosis code set?
Replace the engine-ECU.
Check end.