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. (Except for hybrid model)
READY ON is not possible. (Hybrid model)
Power supply control cannot be executed.

Wiring diagram:

Keyless access with push button start system. Refer to WIRING SYSTEM (IMPREZA MODEL)>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM . Refer to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM . Refer to WIRING SYSTEM (CROSSTREK MODEL (HEV))>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 INSTRUCTIONS FOR IMMOBILIZER" provided as a separate volume.
Before performing diagnosis, refer to "CAUTION" in "General Description". Refer to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

CHECK DTC.
1. Using the Subaru Select Monitor, perform the clear memory of [Keyless Access with Push Button Start]. Refer to COMMON (DIAG)>CLEAR MEMORY .
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. Read the DTC of [Keyless Access with Push Button Start] using the Subaru Select Monitor. Refer to COMMON (diag)>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.
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.
CHECK HARNESS (GROUND SHORT CIRCUIT).
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.
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.
CHECK P RANGE SWITCH.
Check the P range switch. Refer to CONTROL SYSTEMS>AT SHIFT LOCK SOLENOID AND "P" RANGE SWITCH>INSPECTION .

Is the P range switch normal?

Yes: Go to 6.

No: Replace the P range switch. Refer to CONTROL SYSTEM S>AT SHIFT LOCK SOLENOID AND "P" RANGE SWITCH .
CHECK DATA MONITOR.
Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start].
- 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. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .