Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2793 back up power

Subaru Legacy BN/BS (2015-2019) Service Manual / Keyless access with push button start system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2793 back up power

DTC DETECTING CONDITION:

When a fault occurs in +B2 power input for the keyless access CM.

TROUBLE SYMPTOM:

None

CAUTION:

For replacement procedure of keyless access CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

WIRING DIAGRAM:

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

STEP	CHECK	YES	NO
1.CHECK CURRENT DATA. Check the current data display of «Keyless access with push button start» using Subaru Select Monitor. Read Current Data «ECM power supply voltage (back-up)»	Is «ON» displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2793 BACK UP POWER	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2793 BACK UP POWER
2.CHECK DTC. 1) Using the Subaru Select Monitor, clear the memory. Clear Memory Mode 2) Start the engine, and let it idle for 40 seconds or more. 3) Read DTC using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B2793 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2793 BACK UP POWER	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 FUSE. Check the fuse. Relay and Fuse > INSPECTION	Is the fuse OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2793 BACK UP POWER	Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
4.CHECK HARNESS. 1) Disconnect the keyless access CM connector. 2) Using a tester, measure the voltage between the keyless access CM connector and chassis ground. Connector & terminal (i241) No. 40 (+) — Chassis ground (−):	Is the voltage 9.5 — 16 V-	Replace the keyless access CM. Keyless Access CM	Repair or replace the open circuit of harness.

Dtc u0155 lost communication with instrument panel cluster (ipc) control module

Detected when CAN data from meter does not arrive.NOTE:Perform the diagnosis for LAN system. Basic Diagnostic Procedure > PROCEDURE ...

Dtc b1571 reference code incompatibility (immobilizer cm to ecm)

DTC DETECTING CONDITION:Incompatibility of reference code between keyless access CM (model without ID code box) or ID code box (model with ID code box) and ECM occurs.TROUBLE SYMPTOM:Engine will not s ...

Other materials:

Dtc p0341 camshaft position sensor "a" circuit range/performance bank 1 or single sensor
NOTE:For the diagnostic procedure, refer to DTC P0340. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0340 CAMSHAFT POSITION SENSOR "A" CIRCUIT BANK 1 OR SINGLE SENSOR1. OUTLINE OF DIAGNOSISDetect the malfunction of camshaft position sensor property.Judge as NG when the number of ca ...