DTC P2102 Throttle Actuator Control Motor Circuit Low

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Detect as soon as malfunction occurs.
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.

WIRING DIAGRAM:

Fig 1: DTC P2102 Throttle Actuator Control Motor Circuit Low

Courtesy of SUBARU OF AMERICA, INC.

DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW DIAGNOSIS

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 electronic throttle control relay terminal No. 5 and No. 6. Measure the resistance between electronic throttle control terminals. Connector & terminal No. 7 - No. 8:	Is the resistance less than 1 Ω?	Go to step 2.	Replace the electronic throttle control relay.
2. CHECK POWER TO 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. 6 (+) - Chassis ground (-):	Is the voltage more than 5 V?	Go to step 3.	Repair the open power supply circuit or ground short.
3. CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Disconnect the connector from ECM. Turn the ignition switch to ON. Measure the voltage between electronic throttle control relay connector and chassis ground. Connector & terminal (B362) No. 5 (+) - Chassis ground (-):	Is the voltage less than 5 V?	Go to step 4.	Repair the short of power supply circuit between ECM and electronic throttle control.
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. 5 - Chassis ground: (B362) No. 8 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 5.	Repair the ground short 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 (B135) No. 35 - (B362) No. 5: (B137) No. 6 - (B362) No. 8:	Is the resistance less than 1 Ω?	Repair the poor contact in ECM connector. If problem persists, replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . >	Repair the open harness between ECM and electronic throttle control relay.