DTC B228A: Engine Speed Signal(With Auto Start Stop): Wiring diagram

Keyless access with push button start system Ref. to WIRING SYSTEM>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

For replacement procedure of keyless access Control Module, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.
Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

CHECK LAN SYSTEM .
Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Is the check result OK?

Yes : Go to 2 .

No : Perform the inspection according to the diagnosis for LAN system.
CHECK COMBINATION METER .
Confirm that the speedometer is displayed normally.

Is combination meter display OK?

Yes : Go to 3 .

No : Perform the diagnosis for the engine. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
CHECK DATA MONITOR .
Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DATA MONITOR .
- Engine Speed
Can the data be read normally?

Yes : 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.

No : Go to 4 .
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the keyless access Control Module connector.
2. Disconnect the ECM connector.
3. Using a tester, measure the resistance between the keyless access Control Module connector and ECM connector.
  Connector & terminal
  
  (i75) No. 6 - (B134) No. 21:
  
  Is the resistance less than 1 Ω?
  
  Yes : Go to 5 .
  
  No : Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Using a tester, measure the resistance between the keyless access Control Module connector and chassis ground.

Connector & terminal

(i75) No. 6 - Chassis ground:

Is the resistance 10 kΩ or more?

Yes : Go to 6 .

No : Repair or replace the short circuit of the harness.
CHECK HARNESS .
1. Connect the keyless access Control Module connector and ECM connector.
2. Using an oscilloscope, measure the waveform between the keyless access Control Module connector and chassis ground.
  Connector & terminal
  
  (i75) No. 6 - Chassis ground:
  
  Does the pulse stop when the engine is stopped, and does the pulse generate when the engine is started?
  
  Yes : Replace the keyless access Control Module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE .
  
  No : Perform the diagnosis for the engine. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .