DTC P2102 Throttle Actuator Control Motor Circuit Low

WARNING: This page is about a different car, the 2006 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTING CONDITION:

Immediately at fault recognition
GENERAL DESCRIPTION < Ref. to DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Erroneous idling
Poor driving performance
Engine stalls.

CAUTION: After repair or replacement of faulty parts, perform Clear Memory Mode < Ref. to OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to PROCEDURE , Inspection Mode. >.

WIRING DIAGRAM:

Fig 1: Electronic Throttle Control - Wiring Diagram

DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW - DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK ELECTRONIC THROTTLE CONTROL RELAY. Turn the ignition switch to OFF. Remove the electronic throttle control relay Connect the battery to terminals No. 5 and No. 6 of electronic throttle control relay. Measure the resistance between electronic throttle control relay terminals. Terminals No. 7 - No. 8:	Is the resistance less than 1 Ω?	Go to step 2.	Replace the electronic throttle control relay.
2 CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL RELAY. Measure the voltage between electronic throttle control relay connector and chassis ground Connector & terminal (B362) No. 7 (+) - Chassis ground (-): (B362) No. 5 (+) - Chassis ground (-);	Is the voltage more than 5 V?	Go to step 3.	Repair the open or ground short circuit of power supply circuit.
3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Disconnect the connectors from ECM. Turn the ignition switch to ON. Measure the voltage between electronic throttle control relay connector and chassis ground. Connector & terminal (B362) No. 6 (+) - Chassis ground (-):	Is the voltage less than 5 V?	Go to step 4.	Repair the power supply short circuit of harness between ECM and electronic throttle control relay.
4 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Turn the ignition switch to OFF. Measure the resistance between electronic throttle control relay connector and chassis ground. Connector & terminal (B362) No. 6 - Chassis ground: (B362) No. 8 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 5.	Repair the ground short circuit of harness between ECM and electronic throttle control relay.
5 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Measure the resistance between ECM connector and electronic throttle control relay connector. Connector & terminal (B136) No. 21 - (B362) No. 6: (B136) No. 1 - (B362) No. 8:	Is the resistance less than 1 Ω?	Repair the poor contact of ECM connector. Replace the ECM if defective. < Ref. to ENGINE CONTROL MODULE (ECM) . >	Repair the open circuit of harness between ECM and electronic throttle control relay.