P1550

DESCRIPTION

The battery current sensor installed on the positive (+) battery terminal detects the amount of current supplied from the generator.
The battery current sensor changes current to voltage (at the positive (+) battery terminal) and sends it to the ECM. The ECM controls the voltage of the generator based on the signals from the battery current sensor.

DTC No.	DTC Detection Condition	Trouble Area
P1550	The following condition continues for 10 seconds or more with the engine switch on (IG) (1 trip detection logic): Difference between the maximum and minimum current values of the battery current sensor is 1 A or less	Open or short in battery current sensor circuit Battery current sensor assembly ECM
P1551	Battery current sensor output value is 0.2 V or less for 0.5 seconds or more with the engine switch on (IG) (1 trip detection logic):	Short in battery current sensor circuit Battery current sensor assembly ECM
P1552	Battery current sensor output value is 4.8 V or more for 0.5 seconds or more with the engine switch on (IG) (1 trip detection logic):	Open in battery current sensor circuit Battery current sensor assembly ECM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

1. If different DTCs that are related to a different system are output simultaneously while terminal E3 is used as a ground terminal, terminal E3 may be open.
   
2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred (Click here).
   

1. INSPECT BATTERY CURRENT SENSOR ASSEMBLY

1. Disconnect the A48 battery thermometer sensor connector.

2. Measure the resistance of the battery current sensor.

   Standard resistance:

   Tester Connection	Specified Condition
   VC5 (3) - E2 (2)	3 to 6 or 0.7 to 8 kΩ
   VC5 (3) - IB (1)	0.2 to 0.3 or 0.2 to 3 kΩ
   IB (1) - E2 (2)	1.5 to 8 or 3 to 6 kΩ

   HINT:

   The resistance differs according to the tester type.

NG	REPLACE BATTERY CURRENT SENSOR ASSEMBLY

OK

2. CHECK HARNESS AND CONNECTOR (BATTERY CURRENT SENSOR - ECM)

1. Check the harness and the connectors between the ECM and the battery current sensor.

   1. Disconnect the battery current sensor connector.

   2. Disconnect the A6, E3 and E5 ECM connectors.

   3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      IB (A48-1) - IB (A6-24)	Below 1 Ω
      VC5 (A48-3) - VC (E3-29)	Below 1 Ω
      E2 (A48-2) - E3 (E5-30)	Below 1 Ω

      Standard resistance (Check for short):

      Tester Connection	Specified Condition
      IB (A48-1) or IB (A6-24) - Body ground	10 kΩ or higher
      VC5 (A48-3) or VC (E3-29) - Body ground	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE ECM