DTC B227C: P Range Signal Performance

DTC detecting condition: 

When any of the following conditions is established for CVT model.

• The status continues for 20 seconds where the ignition switch is ON, and the shift position (P terminal) is in shift P ("L" level), and the shift information on CAN is other than P.
• The status continues for 20 seconds where the ignition switch is ON, and the shift position (P terminal) is in other than shift P ("H" level), and the shift information on CAN is P.

Trouble symptom: 

• Engine will not start.
• Power supply control cannot be executed.

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.

1. CHECK DTC  .
   1. Disconnect and reconnect the keyless access control module connector.
   2. Using the Subaru Select Monitor, perform the clear memory of [Keyless Access with Push Button Start]. Ref. to COMMON (diag)>CLEAR MEMORY .
   3. Turn the IGN switch to ON.
   4. Place the shift lever in other than P and leave it for one minute.
   5. Read the DTC of [Keyless Access with Push Button Start] using the Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (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.

      Connector & terminal 

      (i44) No. 1 - (i241) 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 (GROUND SHORT CIRCUIT)  .
   1. Disconnect the keyless access control module connector.
   2. Using a tester, measure the resistance between the keyless access control module connector and chassis ground.

      Connector & terminal 

      (i241) No. 18 - Chassis ground:

   Is the resistance 10 kΩ or more?

   Yes  : Go to  4.

   No  : Repair or replace the short circuit of the harness.

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

      Connector & terminal 

      (B281) No. 17 - (i241) No. 30

      (B281) No. 19 - (i241) No. 29

   Is the resistance less than 1 Ω?

   Yes  : Go to  5.

   No  : Repair or replace the open circuit of harness.

5. CHECK P RANGE SWITCH  .

   Check the P range switch. Ref. to CONTROL SYSTEMS>Shift Lock Solenoid and P Range Switch>INSPECTION .

   Is the P range switch normal?

   Yes  : Go to  6.

   No  : Replace the P range switch. Ref. to CONTROL SYSTEMS>SHIFT LOCK SOLENOID AND P RANGE SWITCH .

6. 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 .

   • Shift P signal (AT only)

   Is it turned ON when the shift position is "P"? Is it turned OFF when the shift position is 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. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE .