DTC B227C: P Range Signal Performance

DTC detecting condition: 

When any of the following is established on CVT model.

• The ignition switch ON, the shift position (P terminal) in shift P ("L" level), and the CAN shift information in other than P simultaneously continued for 20 seconds.
• The ignition switch ON, the shift position (P terminal) in other than shift P ("H" level), and the CAN shift information in P simultaneously continued for 20 seconds.

Trouble symptom: 

• Engine will not start.
• Power supply control is not possible.
• Steering lock is not possible.

Wiring diagram: 

Push button start system. Refer to WIRING SYSTEM>PUSH BUTTON START SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC. 
   1. Perform the clear memory for «Keyless Access with Push Button Start» using the Subaru Select Monitor. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>CLEAR MEMORY .
   2. Turn the ignition switch to ON.
   3. Move the shift lever to a position other than P, and leave it for one minute.
   4. Disconnect and connect the keyless access control module connector.
   5. Read DTCs of «Keyless Access with Push Button Start» using the Subaru Select Monitor. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B227C displayed? (Current malfunction)

      Yes:  Go to  2.

      No:  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.
2. CHECK HARNESS (OPEN CIRCUIT). 
   1. Disconnect the P range switch connector.
   2. Disconnect the keyless access control module connector.
   3. Using a tester, measure the resistance between the P range switch connector and the keyless access control module connector and the chassis ground.

      Connector & terminal 

      (B116) No. 1 - (B574) No. 18:

      Is the resistance less than 1 Ω?

      Yes:  Go to  3.

      No:  Repair or replace the open circuit of harness.

3. CHECK HARNESS (OPEN CIRCUIT). 
   1. Disconnect the body integrated unit connector.
   2. Using a tester, measure the resistance between the body integrated unit connector and the keyless access control module connector.

      Connector & terminal 

      (B281) No. 20 - (B574) No. 30:

      (B281) No. 28 - (B574) No. 29:

      Is the resistance less than 1 Ω?

      Yes:  Go to  4.

      No:  Repair or replace the open circuit of harness.

4. CHECK DATA MONITOR. 

   Using the Subaru Select Monitor, check the following items on «Data monitor» of «Keyless Access with Push Button Start».

   • «Shift P signal (AT only)»

   Is it ON when the shift position is in P? Is it OFF when the shift position is in other than P?

   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:  Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .