Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT BATTERY CURRENT SENSOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (BATTERY CURRENT SENSOR - ECM)

DTC P1550 Battery Current Sensor Circuit

DTC P1551 Battery Current Sensor Circuit Low

DTC P1552 Battery Current Sensor Circuit High

DESCRIPTION

Dtc P1550 Battery Current Sensor Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

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 ConditionTrouble Area
P1550The 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
P1551Battery 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
P1552Battery 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

Dtc P1550 Battery Current Sensor Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

  • HINT:
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.
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 .
1.INSPECT BATTERY CURRENT SENSOR ASSEMBLY
Dtc P1550 Battery Current Sensor Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the A48 battery thermometer sensor connector.

Measure the resistance of the battery current sensor.

  • Standard resistance:
  • Tester ConnectionSpecified 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)
Dtc P1550 Battery Current Sensor Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

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


Disconnect the battery current sensor connector.

Disconnect the A6, E3 and E5 ECM connectors.

Measure the resistance of the wire harness side connectors.

  • Standard resistance (Check for open):
  • Tester ConnectionSpecified 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 ConnectionSpecified Condition
    IB (A48-1) or IB (A6-24) - Body ground10 kΩ or higher
    VC5 (A48-3) or VC (E3-29) - Body ground10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM
LEXUS IS250, IS220d / GSE20 ALE20
4GR-FSE ENGINE CONTROL SYSTEM
Lexus IS250 IS220d GSE20 ALE20
SFI SYSTEM