DTC    P1550    Battery Current Sensor Circuit

DTC    P1551    Battery Current Sensor Circuit Low

DTC    P1552    Battery Current Sensor Circuit High

for Preparation Click here


DESCRIPTION

A194388E01
The battery current sensor assembly installed on the negative (-) battery terminal detects the amount of current supplied from the generator.
The battery current sensor assembly changes current to voltage (at the negative (-) battery terminal) and sends it to the power management control ECU. The power management control ECU controls the voltage of the generator based on the signals from the battery current sensor assembly.

DTC No.
DTC Detection Condition
Trouble Area
P1550
Difference between the maximum and minimum current values of the battery current sensor is less than 1 A for 10 seconds or more with the ignition switch ON
(1-trip detection logic)
  1. Battery current sensor assembly
  2. Short in battery current sensor circuit
  3. Power management control ECU
P1551
Battery current sensor output value is less than 0.2 V for 0.5 seconds or more with the ignition switch ON
(1-trip detection logic)
  1. Battery current sensor assembly
  2. Open or short to GND in battery current sensor circuit
  3. Power management control ECU
P1552
Battery current sensor output value is more than 4.8 V for 0.5 seconds or more with the ignition switch ON
(1-trip detection logic)
  1. Battery current sensor assembly
  2. Short to +B or VC in battery current sensor circuit
  3. Power management control ECU

WIRING DIAGRAM


B211641E01


INSPECTION PROCEDURE

1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P1550, P1551, P1552)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Charging Control / DTC.

  1. Read the DTC.
    Result 
    Result
    		Proceed to
    DTC P1550, P1551 and P1552 are output
    		A
    DTC P1550, P1551, P1552 and other DTCs are output
    		B

    HINT:
    If any DTCs other than P1550, P1551 and P1552 are output, troubleshoot those DTCs first.



B
GO TO DTC CHART (Click here)
A


2.READ VALUE USING INTELLIGENT TESTER (BATTERY CURRENT)

  1. Turn all of the electrical systems (headlights, blower motor, rear defogger, etc.) off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Charging Control / Data List / Battery Current.
    Result 
    Result
    		Proceed to
    Battery current is fixed at 0 A, or fluctuates by +/- 1 A or less between -100 and 100 A
    		A
    Battery current fluctuates between -20 and 0A
    		B



B
USE SIMULATION METHOD TO CHECK (Click here)
A


3.INSPECT BATTERY CURRENT SENSOR ASSEMBLY


    A193670E08

  1. Disconnect the cable from the negative (-) battery terminal.

  1. Disconnect the battery current sensor assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B10-2 (VC5) - B10-4 (E2)
    		Always
    		3 to 10 kΩ
    B10-2 (VC5) - B10-3 (IB)
    		Always
    		Below 0.5 kΩ
    B10-3 (IB) - B10-4 (E2)
    		Always
    		3 to 10 kΩ

    Text in Illustration 
    *1
    		Component without harness connected
    (Battery Current sensor Assembly)

  1. Reconnect the cable to the negative (-) battery terminal.



NG
REPLACE BATTERY CURRENT SENSOR ASSEMBLY (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (BATTERY CURRENT SENSOR - POWER MANAGEMENT CONTROL ECU)

  1. Disconnect the power management control ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

  1. w/o Entry and Start System

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B10-2 (VC5) - D37-12 (VC)
    		Always
    		Below 1 Ω
    B10-3 (IB) - D37-13 (IB)
    B10-4 (E2) - D37-18 (E2)
    B10-2 (VC5) or D37-12 (VC) - Body ground
    		Always
    		10 kΩ or higher
    B10-3 (IB) or D37-13 (IB) - Body ground
    B10-4 (E2) or D37-18 (E2) - Body ground

  1. w/ Entry and Start System

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B10-2 (VC5) - D36-23 (VC)
    		Always
    		Below 1 Ω
    B10-3 (IB) - D36-30 (IB)
    B10-4 (E2) - D36-25 (E2)
    B10-2 (VC5) or D36-23 (VC) - Body ground
    		Always
    		10 kΩ or higher
    B10-3 (IB) or D36-30 (IB) - Body ground
    B10-4 (E2) or D36-25 (E2) - Body ground



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)