CHARGING SYSTEM, Diagnostic DTC:P1550,P1551 and P1552

DESCRIPTION

The battery current sensor assembly detects the battery charge and discharge current amount.

The battery current sensor assembly changes this information into a voltage signal and outputs it to the ECM.

Based on this signal, the ECM sends power generation voltage commands to the generator.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P1550	Battery Current Sensor Circuit	Difference between the maximum and minimum current values of the battery current sensor is less than 1 A for 10 seconds or more (1 trip detection logic)	Battery current sensor assembly ECM Wire harness or connector	Does not come on	DTC stored
P1551	Battery Current Sensor Circuit Low	Battery current sensor output value is abnormally low for 0.5 seconds or more with the ignition switch ON (1 trip detection logic)	Battery current sensor assembly ECM Wire harness or connector	Does not come on	DTC stored
P1552	Battery Current Sensor Circuit High	Battery current sensor output value is abnormally high for 0.5 seconds or more with the ignition switch ON (1 trip detection logic)	Battery current sensor assembly ECM Wire harness or connector	Does not come on	DTC stored

WIRING DIAGRAM

PROCEDURE

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

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

   5. Read the DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Proceed to
      DTC P1550, P1551 or P1552 is output
      DTC P1550, P1551 or P1552 and other DTCs are output

      Tip:

      If any DTCs other than P1550, P1551 or P1552 are output, troubleshoot those DTCs first.

   DTC P1550, P1551 or P1552 and other DTCs are output

   GO TO DTC CHART

   Click here

   DTC P1550, P1551 or P1552 is output

2. READ VALUE USING GTS (BATTERY CURRENT)

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

   2. Connect the GTS to the DLC3.

   3. Turn the ignition switch to ON.

   4. Turn the GTS on.

   5. Enter the following menus: Powertrain / Engine and ECT / Data List / Battery Current.

      Powertrain > Engine > Data List

      Tester Display
      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 0 A	B

   B

   CHECK FOR INTERMITTENT PROBLEMS

   Click hereClick hereClick hereClick hereClick hereClick here

   A

3. INSPECT BATTERY CURRENT SENSOR ASSEMBLY

   1. Inspect the battery current sensor assembly.

      Click here

      Result

      Result
      OK
      NG

   NG

   REPLACE BATTERY CURRENT SENSOR ASSEMBLY

   Click here

   OK

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

   1. Disconnect the B76 ECM connector.

   2. Disconnect the B72 battery current sensor assembly connector.

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

      Standard Resistance (Check for Open)

      Tester Connection	Condition	Specified Condition
      B76-77 (EIB) - B72-4 (E2)	Always	Below 1 Ω
      B76-75 (VCIB) - B72-2 (VC5)	Always	Below 1 Ω
      B76-116 (IB) - B72-3 (IB)	Always	Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection	Condition	Specified Condition
      B76-77 (EIB) or B72-4 (E2) - Body ground	Always	10 kΩ or higher
      B76-75 (VCIB) or B72-2 (VC5) - Body ground	Always	10 kΩ or higher
      B76-116 (IB) or B72-3 (IB) - Body ground	Always	10 kΩ or higher

   Result

   Result
   OK
   NG

   OK

   REPLACE ECM

   Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR