Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b250f rotation sensor pulse/count

Subaru Legacy BN/BS (2015-2019) Service Manual / Power rear gate system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b250f rotation sensor pulse/count

DTC DETECTING CONDITION:

Output of the power rear gate drive unit rotation sensor is out of specified range.

TROUBLE SYMPTOM:

Auto operation stops halfway.

WIRING DIAGRAM:

Power rear gate system Power Rear Gate System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK AUTO OPERATION. 1) Turn the ignition switch to OFF. 2) Using operation switch, perform power rear gate auto open/close operation from full close position or full open position.	Does it work as fully open > fully close and fully close > fully open-	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.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B250F ROTATION SENSOR PULSE/COUNT
2.CHECK DTC. 1) Turn the ignition switch to ON. 2) Using the Subaru Select Monitor, read DTC of PRG CM. Read Diagnostic Trouble Code (DTC)	Is DTC B250F displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B250F ROTATION SENSOR PULSE/COUNT	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.
3.CHECK CURRENT DATA. 1) Activate the auto closer to a fully closed position. 2) Using the Subaru Select Monitor, confirm the «Pulse-count 2» when fully closed and fully open. Read Current Data NOTE: When confirming the current data, display only one item to be checked at a time. When the displayed items are too many, changes in the pulses will not be retrieved.	Does the value show six pulses when fully closed, and 1800 pulses when fully open-	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.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B250F ROTATION SENSOR PULSE/COUNT
4.CHECK PRG CM. Using an oscilloscope, measure the waveform between PRG CM connectors. Connector & terminal (R424) No. 9 (+) — (R424) No. 11 (−): (R424) No. 10 (+) — (R424) No. 11 (−):	Does the waveform change as noted in the margin when the power rear gate is manually opened/closed-	Replace the PRG CM. Power Rear Gate Control Module	Replace the PRG DU. Power Rear Gate Drive Unit

NOTE:

• When the power rear gate is open

(A)

Approx. 10 V

(B)

Cycles change according to the time the power rear gate is opened/closed.

• When the power rear gate is closed

(A)

Approx. 10 V

(B)

Cycles change according to the time the power rear gate is opened/closed.

Dtc b2511 rotation sensor pulse/reverse direction

DTC DETECTING CONDITION:When output of the power rear gate drive unit rotation sensor is different from the direction that it should be.TROUBLE SYMPTOM:Auto-operation does not function.WIRING DIAGRAM: ...

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