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Home >> Subaru >> 2015 >> BRZ Series.Blue, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Entry Start System Start System (Keyless Start) >> Entry & Start System (Start Function) >> DTC B2271: IGN Fuse Blown Or IGN Circuit Fault >> Circuit description
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Circuit description

This DTC is output when a problem is detected in the IG1 drive circuit, the IG2 drive circuit, or the IG hold circuit in the collation ECM (smart key ECM assembly).

NOTE: If you remove and then reconnect the battery cable, the power returns to the mode it was before you removed the cable.
DTC DETECTION CONDITION

DTC No. DTC Detection Status Faulty Part DTC Output Confirmation Operation
B2271 Meet any of the conditions (1-trip detection logic(1)):
  • There is a problem in the IG1 or IG2 drive of the collation ECM (smart key ECM assembly).
  • There is a problem in the 1G hold circuit of the collation ECM (smart key ECM assembly).
  • AM2 No. 2 fuse
  • Collation ECM (smart key ECM assembly)
  • Wiring harness or connector
 Turn the ignition switch to ON.
NOTE: To turn the engine switch to on (IG), hold the key, move the shift lever into P or N (2), remove your foot from the brake pedal (2) or the clutch (3), and press the engine switch 2 times.
(1) The code is output only when the problem is found and the engine switch is on (IG).
(2) With automatic transmission
(3) With manual transmission
NOTE:
  • The IG1 and IG2 drive circuits drive the IG1 and IG2 relays.
  • Even if the collation ECM (smart key ECM assembly) performs an inaccurate operation, if the IG1 drive circuit and the IG2 drive circuit are on, the IG hold circuit will hold the engine switch in an on (IG) status.

Vehicle status and failsafe function when a problem is detected

VEHICLE STATUS AND FAILSAFE FUNCTION PROBLEM DETECTED

Vehicle Status When A Problem Is Detected Failsafe Function When A Problem Is Detected
The power mode cannot be changed to on (IG). (the engine does not start) The power mode does not change to on (IG).

Related [Current Data Display & Save] and [System Operation Check Mode] items

DTC DESCRIPTION

DTC No. [Current Data Display & Save] Items [System Operation Check Mode] Items
B2271 Power supply
  • [IG1 relay monitor (outside)]
  • [IG2 relay monitor (outside)]

Engine
  • [Ignition]
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