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.