Wiring Diagram:

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

Fig 1: Wiring Diagram - DTC P2101 Throttle Actuator Control Motor Circuit Range/Performance

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE (DTC P2101)

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 ?	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. 6 (+) - 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 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 power supply short circuit in harness 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 M?	Go to step 5.	Repair the ground short circuit in 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 ?	Go to step 6.	Repair the open circuit in harness between ECM and electronic throttle control relay.
6 CHECK SENSOR OUTPUT. Connect all the connectors. Turn the ignition switch to ON. Measure the voltage between ECM connector terminals. Connector & terminal (B136) No. 18 (+) - (B136) No. 35 (-):	Is the voltage more than 0.4 V?	Go to step 7.	Go to step 9.
7 CHECK SENSOR OUTPUT. Connect all the connectors. Turn the ignition switch to ON. Measure the voltage between ECM connector terminals. Connector & terminal (B136) No. 29 (+) - (B136) No. 35 (-):	Is the voltage more than 0.8 V?	Go to step 8.	Go to step 9.
8 CHECK POOR CONTACT. Check the poor contact in connector between ECM and electronic throttle control.	Is there poor contact?	Repair the poor contact.	Go to step 13.
9 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the electronic throttle control control. Measure the resistance between ECM connector and electronic throttle control connector. Connector & terminal (B136) No. 16 - (E57) No. 5:	Is the resistance less than 1 ?	Go to step 10.	Repair the open circuit of harness connector.
10 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Measure the resistance between ECM connector and chassis ground. Connector & terminal (B136) No. 16 - Chassis ground: (B136) No. 18 - Chassis ground: (B136) No. 29 - Chassis ground:	Is the resistance more than 1 M?	Go to step 11.	Repair the ground short circuit of harness.
11 CHECK SENSOR POWER SUPPLY. Connect the ECM connector. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector & terminal (E57) No. 5 (+) - Engine ground (-):	Is the voltage 4.5 - 5.5 V?	Go to step 12.	Repair the poor contact in ECM connector. Replace the ECM if defective. < Ref. to ENGINE CONTROL MODULE (ECM) . >
12 CHECK SHORT CIRCUIT IN ECM. Turn the ignition switch to OFF. Measure the resistance between electronic throttle control connector and engine ground. Connector & terminal (E57) No. 6 - Engine ground: (E57) No. 4 - Engine ground:	Is the resistance more than 10 ?	Go to step 13.	Repair the poor contact in ECM connector. Replace the ECM if defective. < Ref. to ENGINE CONTROL MODULE (ECM) . >
13 CHECK SENSOR OUTPUT. Connect all the connectors. Turn the ignition switch to ON. Read the data of main throttle sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >	Is the voltage 4.63 V?	Go to step 14.	Go to step 16.
14 CHECK SENSOR OUTPUT. Read the data of sub throttle sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >	Is the voltage 4.73 V?	Go to step 15.	Go to step 16.
15 CHECK POOR CONTACT. Check the poor contact in connector between ECM and electronic throttle control.	Is there poor contact?	Repair the poor contact.	Go to step 20.
16 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the electronic throttle control control. Measure the resistance between ECM connector and electronic throttle control connector. Connector & terminal (B136) No. 35 - (E57) No. 3: (B136) No. 18 - (E57) No. 6: (B136) No. 29 - (E57) No. 4:	Is the resistance less than 1 ?	Go to step 17.	Repair the open circuit of harness connector.
17 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Connect the ECM connector. Measure the resistance between electronic throttle control connector and engine ground. Connector & terminal (E57) No. 3 - Engine ground:	Is the resistance less than 5 ?	Go to step 18.	Repair the poor contact in ECM connector. Replace the ECM if defective. < Ref. to ENGINE CONTROL MODULE (ECM) . >
18 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Measure the voltage between electronic throttle control connector and engine ground. Connector & terminal (E57) No. 6 (+) - Engine ground (-): (E57) No. 4 (+) - Engine ground (-):	Is the voltage less than 10 V?	Go to step 19.	Repair the short circuit in harness between ECM connector and electronic throttle control connector.
19 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Remove the ECM. Measure the resistance between ECM connectors. Connector & terminal (B136) No. 18 - (B136) No. 35: (B136) No. 29 - (B136) No. 35:	Is the resistance more than 1 M?	Go to step 20.	Repair the short circuit to sensor power supply.
20 CHECK SENSOR OUTPUT. Turn the ignition switch to OFF. Connect the connectors except of the electric control throttle relay. Turn the ignition switch to ON. Read the data of main throttle sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >	Is the voltage 0.81 - 0.87 V?	Go to step 21.	Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective.
21 CHECK SENSOR OUTPUT. Read the data of sub throttle sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >	Is the voltage 1.64 - 1.70 V?	Go to step 22.	Repair the poor contact in ECM connector. Replace the electronic throttle control if defective.
22 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the electronic throttle control control. Measure the resistance between ECM connector and electronic throttle control connector. Connector & terminal (B137) No. 5 - (E57) No. 2: (B137) No. 4 - (E57) No. 1:	Is the resistance less than 1 ?	Go to step 23.	Repair the open circuit of harness connector.
23 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Connect the connector to ECM. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector & terminal (E57) No. 2 (+) - Engine ground (-): (E57) No. 1 (+) - Engine ground (-):	Is the voltage less than 5 V?	Go to step 24.	Repair power supply short circuit in harness between ECM and electronic throttle control.
24 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector & terminal (E57) No. 2 - Engine ground: (E57) No. 1 - Engine ground:	Is the resistance more than 1 M?	Go to step 25.	Repair the short circuit of harness.
25 CHECK ELECTRONIC THROTTLE CONTROL MOTOR HARNESS. Measure the resistance between electronic throttle control connector terminals. Connector & terminal (E57) No. 2 - (E57) No. 1:	Is the resistance more than 1 M?	Go to step 26.	Repair the short circuit of harness.
26 CHECK ELECTRONIC THROTTLE CONTROL GROUND CIRCUIT. Measure the resistance between ECM connector and chassis ground. Connector & terminal (B137) No. 3 - Chassis ground:	Is the resistance less than 10 ?	Go to step 27.	Repair the open circuit of harness.
27 CHECK ELECTRONIC THROTTLE CONTROL. Measure the resistance between electronic throttle control terminals. Terminals No. 1 - No. 2:	Is the resistance less than 5 ?	Go to step 28.	Replace the electronic throttle control control.
28 CHECK ELECTRONIC THROTTLE CONTROL. Move the throttle valve to the fully open and fully closed positions with fingers. Check the valve returns to the specified position when releasing fingers.	Does the valve return to the specified position? Standard value: 3 mm (0.12 in) from fully closed position	Repair the poor contact in ECM connector. Replace the ECM if defective. < Ref. to ENGINE CONTROL MODULE (ECM) . >	Replace the electronic throttle control control.