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Subaru Crosstrek Service Manual: Dtc p1531 battery current sensor circuit high

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P1531 BATTERY CURRENT SENSOR CIRCUIT HIGH

DTC detecting condition:

Immediately at fault recognition

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">, and Inspection Mode Inspection Mode > PROCEDURE">.

Wiring diagram:

Engine electrical system Engine Electrical System">

STEPCHECKYESNO

1.CHECK CURRENT DATA.

1) Start the engine.

2) Read the value of «Battery current value» using the Subaru Select Monitor.

NOTE:

For detailed operation procedures, refer to “Current Data Display For Engine”. Subaru Select Monitor">

Is the value of «Battery current value» 100 A or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1531 BATTERY CURRENT SENSOR CIRCUIT HIGH">Go to Step 2.

Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

2.CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the battery current sensor.

3) Start the engine.

4) Read the value of «Battery current value» using the Subaru Select Monitor.

NOTE:

For detailed operation procedures, refer to “Current Data Display For Engine”. Subaru Select Monitor">

Is the value of «Battery current value» 100 A or more?

Repair the short circuit to power in the harness between ECM connector and battery current sensor connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1531 BATTERY CURRENT SENSOR CIRCUIT HIGH">Go to Step 3.

3.CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Measure the resistance of the harness between the battery current sensor connector and engine ground.

Connector & terminal

(B538) No. 2 — Engine ground:

Is the resistance less than 5 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1531 BATTERY CURRENT SENSOR CIRCUIT HIGH">Go to Step 4.

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit in harness between ECM connector and battery current sensor connector

Poor contact of joint connector

4.CHECK FOR POOR CONTACT.

Check for poor contact of the battery current sensor connector.

Is there poor contact of the battery current sensor connector?

Repair the poor contact of the battery current sensor connector.

Replace the battery current sensor. Battery Current & Temperature Sensor">

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of battery current sensor.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

(1)

Hall IC

(2)

Chip condenser

(3)

Core

3. EXECUTION CONDITION

Secondary Parameters

Execution condition

Battery voltage

≥ 10.9 V

Elapsed time after starting the engine

> 1000 ms

Engine speed

> 500 rpm

Ignition switch

ON

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

5. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

Output voltage

≥ 4.717 V

Time Needed for Diagnosis: 500 ms

Malfunction Indicator Light Illumination: Does not illuminate even when malfunction occurs.

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