Subaru Crosstrek Service Manual: Dtc b228a engine speed signal(with auto start stop)

DTC detecting condition:

When the engine speed signal transmitted from the ECM via solid line and the engine speed signal transmitted from the ECM via CAN communication line do not match.

Trouble symptom:

Cannot start the engine, or the engine stops after starting.

CAUTION:

For replacement procedure of keyless access CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

1.CHECK LAN SYSTEM.

Inspect LAN system. Basic Diagnostic Procedure > PROCEDURE">

Is LAN system normal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B228A ENGINE SPEED SIGNAL(WITH Auto Start Stop)">Go to Step 2.

Perform the inspection according to the diagnosis for LAN system.

2.CHECK COMBINATION METER.

Confirm that the speedometer is displayed normally.

Is the meter display normal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2286 ENGINE SPEED SIGNAL(WITHOUT Auto Start Stop)">

Perform the diagnosis for the engine. Basic Diagnostic Procedure > PROCEDURE">

3.CHECK CURRENT DATA.

Check the current data display of «Keyless Access with Push Button Start» using Subaru Select Monitor. Read Current Data">

• «Engine speed»

Can the data be read normally?

Even if DTC is displayed, 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.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B228A ENGINE SPEED SIGNAL(WITH Auto Start Stop)">Go to Step 4.

4.CHECK HARNESS (OPEN CIRCUIT).

1) Disconnect the keyless access CM connector.

2) Disconnect the ECM connector.

3) Using a tester, measure the resistance between the keyless access CM connector and ECM connector.

Connector & terminal

(B572) No. 17 — (B135) No. 15:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B228A ENGINE SPEED SIGNAL(WITH Auto Start Stop)">Go to Step 5.

Repair or replace the open circuit of harness.

5.CHECK HARNESS (GROUND SHORT CIRCUIT).

Using a tester, measure the resistance between the keyless access CM connector and chassis ground.

Connector & terminal

(B572) No. 17 — Chassis ground:

Is the resistance 10 k? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B228A ENGINE SPEED SIGNAL(WITH Auto Start Stop)">Go to Step 6.

Repair or replace the short circuit of the harness.

6.CHECK HARNESS.

1) Connect the keyless access CM connector and ECM connector.

2) Using the Subaru Select Monitor, measure the waveform between the keyless access CM connector and chassis ground.

Connector & terminal

(B572) No. 17 — Chassis ground:

Does the pulse stop when the engine is stopped, and does the pulse generate when the engine is started?

Replace the keyless access CM. Keyless Access CM">

Perform the diagnosis for the engine. Basic Diagnostic Procedure > PROCEDURE">

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