April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P2103: Throttle Actuator "A" Control Motor Circuit High: Notes

DTC detecting condition:

Immediately at fault recognition

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>CLEAR MEMORY MODE>OPERATION ., and inspection mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>INSPECTION MODE>PROCEDURE .
Use the check board when measuring the ECM terminal voltage and resistance.

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

G12409931

Courtesy of SUBARU OF AMERICA, INC.

CHECK ELECTRONIC THROTTLE CONTROL RELAY .
1. Turn the ignition switch to OFF.
2. Remove the electronic throttle control relay.
3. Measure the resistance between electronic throttle control relay terminals.
  Terminals
  
  No. 23 - No. 22:
Is the resistance 1 MΩ or more?

Yes: Go to 2 .

No: Replace the electronic throttle control relay. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ELECTRONIC THROTTLE CONTROL RELAY .
CHECK SHORT CIRCUIT OF ELECTRONIC THROTTLE CONTROL RELAY POWER SUPPLY .
1. Turn the ignition switch to ON.
2. Measure the voltage between electronic throttle control relay connector and chassis ground.
  Connector & terminal
  
  (B48) No. 23 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes: Repair the short circuit to power in the harness between ECM connector and electronic throttle control relay connector.

No: Go to 3 .
CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY CONNECTOR .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance between ECM connector and chassis ground.
  Connector & terminal
  
  (B134) No. 65 - Chassis ground:
Is the resistance 1 MΩ or more?

Yes: Repair the poor contact of ECM connector.

No: Repair the short circuit to ground in harness between ECM connector and electronic throttle control relay connector.