Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM
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
The battery current sensor installed on the positive battery terminal detects the amount of current supplied from the alternator.
The battery current sensor changes current to voltage and outputs that voltage. The battery current sensor changes current at the positive battery terminal to voltage and sends it to the ECM. The ECM controls the voltage of the alternator 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 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 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 ECM |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- After replacing the ECM, the new ECM needs registration and initialization .
| 1.INSPECT BATTERY CURRENT SENSOR ASSEMBLY |
Disconnect the A48 battery current sensor connector.
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 kΩ IB (1) - E2 (2) 1.5 to 8 or 3 to 6 kΩ
- HINT:
- The resistance differs according to the tester type.
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| OK | |
| 2.CHECK HARNESS AND CONNECTOR (BATTERY CURRENT SENSOR - ECM) |
Check the harness and the connectors between the ECM and the battery current sensor.
Disconnect the A48 battery current sensor connector.
Disconnect the E59 ECM connectors.
Measure the resistance of the wire harness side connectors.
- Standard resistance (Check for open):
Tester Connection Specified Condition IB (A48-1) - IB (E59-116) Below 1 Ω VC5 (A48-3) - VCIB (E59-70) Below 1 Ω E2 (A48-2) - EIB (E59-93) Below 1 Ω
- Standard resistance (Check for short):
Tester Connection Specified Condition IB (A48-1) or IB (E59-116) - Body ground 10 kΩ or higher VC5 (A48-3) or VCIB (E59-70) - Body ground 10 kΩ or higher
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| OK | ||
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