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 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 cannot be executed.
• The steering lock is not possible.

Wiring diagram: 

Keyless access with push button start system Refer to WIRING SYSTEM>Keyless Access With Push Button Start System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .
   1. Using the Subaru Select Monitor, perform the clear memory of [Keyless Access with Push Button Start(Power Supply)] and [Keyless Access with Push Button Start(Collation)]. Refer to COMMON (DIAG)>CLEAR MEMORY .
      • Keyless Access with Push Button Start(Power Supply)
      • Keyless Access with Push Button Start(Collation)
   2. Turn the IGN switch to ON.
   3. Place the shift lever in other than P and leave it for one minute.
   4. Disconnect and reconnect the keyless access Control Module connector.
   5. Using the Subaru Select Monitor, read the DTCs of [Keyless Access with Push Button Start(Power Supply)] and [Keyless Access with Push Button Start(Collation)]. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
   • Keyless Access with Push Button Start(Power Supply)
   • Keyless Access with Push Button Start(Collation)

   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 

   (i136) No. 1 - (i92) 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)  .

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

   Connector & terminal 

   (i92) 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 

   (B73) No. 17 - (i92) No. 30

   (B73) No. 19 - (i92) 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. Refer to CONTROL SYSTEMS>Shift Lock Solenoid and P Range Switch>INSPECTION .

   Is the P range switch OK?

   Yes:  Go to  6.

   No  : Replace the P range switch. Refer 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(Power Supply)] and [Keyless Access with Push Button Start(Collation)]. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DATA MONITOR .

   • Keyless Access with Push Button Start(Power Supply)
     • Shift P signal(AT only)
   • Keyless Access with Push Button Start(Collation)
   • Shift P signal(AT only)

   Is it turned [ON] when the shift position is in "P"? Is it turned [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 .