P1551

DTC P1551, P1552 BATTERY CURRENT SENSOR




Component Description
The power generation voltage variable control enables fuel consumption to be decreased by reducing the engine load which is caused by the power generation of the generator. The battery current sensor (1) is installed to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the battery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is performed. When performing the power generation voltage variable control, ECM calculates the target power generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation command value to IPDM E/R. For the details of the power generation voltage variable control, refer to Starting and Charging.

CAUTION: Do not connect the electrical component or the ground wire directly to the battery terminal. The connection causes the malfunction of the power generation voltage variable control, and then the battery discharge may occur.




CONSULT-II Reference Value in Data Monitor Mode




On Board Diagnosis Logic

DTC Confirmation Procedure
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V with ignition switch ON

WITH CONSULT-II
1. Turn ignition switch ON.




2. Select "DATA MONITOR" mode with CONSULT-II.
3. Wait at least 10 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

WITH GST
Follow the procedure "WITH CONSULT-II".

EC-CUR/SE-01:

Wiring Diagram

Step 1:

Step 2-5:

Step 6-9:

Diagnostic Procedure

Component Inspection

BATTERY CURRENT SENSOR
1. Reconnect harness connectors disconnected.




2. Disconnect battery negative cable (1).
: <- : To body ground

3. Install jumper cable (A) between battery negative terminal and body ground.
4. Turn ignition switch ON.




5. Check voltage between ECM terminal 71 (battery current sensor signal) and ground.

Voltage: Approximately 2.5 V

6. If NG, replace battery negative cable assembly.