ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P2101 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

• Engine stalls.

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK ELECTRONIC THROTTLE CONTROL RELAY.

1) Turn the ignition switch to OFF.

2) Remove the electronic throttle control relay.

3) Connect the battery to terminals No. 1 and No. 3 of electronic throttle control relay.

4) Measure the resistance between electronic throttle control relay terminals.

Terminals

No. 2 — No. 4:

Is the resistance less than 1 Ω?

Replace the electronic throttle control relay.

2.CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL RELAY.

1) Turn the ignition switch to ON.

2) Measure the voltage between electronic throttle control relay connector and chassis ground.

Connector & terminal

(B309) No. 1 (+) — Chassis ground (−):

(B309) No. 2 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Repair the open or ground short circuit of power supply circuit.

3.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM.

3) Turn the ignition switch to ON.

4) Measure the voltage between electronic throttle control relay connector and chassis ground.

Connector & terminal

(B309) No. 3 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Repair the power supply short circuit of harness between ECM and electronic throttle control.

4.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY.

1) Turn the ignition switch to OFF.

2) Measure the resistance between electronic throttle control relay connector and chassis ground.

Connector & terminal

(B309) No. 3 — Chassis ground:

(B309) No. 4 — Chassis ground:

Is the resistance more than 1 MΩ?

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

(B135) No. 6 — (B309) No. 3:

(B136) No. 1 — (B309) No. 4:

(B136) No. 2 — (B309) No. 4:

Is the resistance less than 1 Ω?

Repair the open circuit of harness between ECM and electronic throttle control relay.

6.CHECK SENSOR OUTPUT.

1) Connect all connectors.

2) Turn the ignition switch to ON.

3) Measure the voltage between ECM connector terminals.

Connector & terminal

(B137) No. 24 (+) — (B137) No. 31 (−):

Is the voltage more than 0.3 V?

7.CHECK SENSOR OUTPUT.

Measure the voltage between ECM connector terminals.

Connector & terminal

(B137) No. 23 (+) — (B137) No. 31 (−):

Is the voltage less than 4.8 V?

8.CHECK POOR CONTACT.

Check poor contact in connector between ECM and electronic throttle control.

Is there poor contact?

Repair the poor contact.

9.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM.

3) Disconnect the connectors from electronic throttle control.

4) Measure the resistance between ECM connector and electronic throttle control connector.

Connector & terminal

(B137) No. 23 — (E57) No. 5:

(B137) No. 24 — (E57) No. 2:

(B137) No. 25 — (E57) No. 4:

Is the resistance less than 1 Ω?

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

(B137) No. 25 — Chassis ground:

(B137) No. 23 — Chassis ground:

(B137) No. 24 — Chassis ground:

Is the resistance more than 1 MΩ?

Repair the ground short circuit of harness.

11.CHECK SENSOR POWER SUPPLY.

1) Connect the ECM connector.

2) Turn the ignition switch to ON.

3) Measure the voltage between electronic throttle control connector and engine ground.

Connector & terminal

(E57) No. 4 (+) — Engine ground (−):

Is the voltage 4.5 — 5.5 V?

Repair the poor contact of ECM connector. Replace the ECM if defective.

12.CHECK SHORT CIRCUIT IN ECM.

1) Turn the ignition switch to OFF.

2) Measure the resistance between electronic throttle control connector and engine ground.

Connector & terminal

(E57) No. 2 — Engine ground:

(E57) No. 5 — Engine ground:

Is the resistance more than 10 Ω?

Repair the poor contact of ECM connector. Replace the ECM if defective.

13.CHECK SENSOR OUTPUT.

1) Connect all connectors.

2) Turn the ignition switch to ON.

3) Read the data of main throttle sensor signal using Subaru Select Monitor.

NOTE:

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

Is the voltage 0.5 — 1.0 V?

14.CHECK SENSOR OUTPUT.

Read the data of sub throttle sensor signal using Subaru Select Monitor.

NOTE:

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

Is the voltage 0.5 — 1.0 V?

15.CHECK POOR CONTACT.

Check poor contact in connector between ECM and electronic throttle control.

Is there poor contact?

Repair the poor contact.

16.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM.

3) Disconnect the connectors from electronic throttle control.

4) Measure the resistance between ECM connector and electronic throttle control connector.

Connector & terminal

(B137) No. 23 — (E57) No. 5:

(B137) No. 24 — (E57) No. 2:

(B137) No. 31 — (E57) No. 1:

Is the resistance less than 1 Ω?

Repair the open circuit of harness connector.

17.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Connect the ECM connector.

2) Measure the resistance between electronic throttle control connector and engine ground.

Connector & terminal

(E57) No. 1 — Engine ground:

Is the resistance less than 5 Ω?

Repair the poor contact of ECM connector. Replace the ECM if defective.

18.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Turn the ignition switch to ON.

2) Measure the voltage between electronic throttle control connector and engine ground.

Connector & terminal

(E57) No. 4 (+) — Engine ground (−):

Is the voltage less than 10 V?

Repair the battery short circuit of harness between ECM connector and electronic throttle control connector.

19.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

Measure the voltage between electronic throttle control connector and engine ground.

Connector & terminal

(E57) No. 5 (+) — Engine ground (−):

(E57) No. 2 (+) — Engine ground (−):

Is the voltage less than 10 V?

Repair the short circuit of harness between ECM connector and electronic throttle control connector.

20.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Turn the ignition switch to OFF.

2) Remove the ECM.

3) Measure the resistance between ECM connectors.

Connector & terminal

(B137) No. 23 — (B137) No. 25:

(B137) No. 24 — (B137) No. 25:

Is the resistance more than 1 MΩ?

Repair the short circuit to sensor power supply.

21.CHECK SENSOR OUTPUT.

1) Turn the ignition switch to OFF.

2) Connect the connectors except for electronic throttle control relay.

3) Turn the ignition switch to ON.

4) Read the data of main throttle sensor signal using Subaru Select Monitor.

NOTE:

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

Is the voltage 0.5 — 1.0 V?

Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective.

22.CHECK SENSOR OUTPUT.

Read the data of sub throttle sensor signal using Subaru Select Monitor.

NOTE:

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

Is the voltage 0.5 — 1.0 V?

Repair the poor contact of ECM connector. Replace the electronic throttle control if defective.

23.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM.

3) Disconnect the connectors from electronic throttle control.

4) Measure the resistance between ECM connector and electronic throttle control connector.

Connector & terminal

(B137) No. 2 — (E57) No. 3:

(B137) No. 3 — (E57) No. 3:

(B137) No. 4 — (E57) No. 6:

(B137) No. 5 — (E57) No. 6:

Is the resistance less than 1 Ω?

Repair the open circuit of harness connector.

24.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR.

1) Connect the connector to ECM.

2) Turn the ignition switch to ON.

3) Measure the voltage between electronic throttle control connector and engine ground.

Connector & terminal

(E57) No. 3 (+) — Engine ground (−):

(E57) No. 6 (+) — Engine ground (−):

Is the voltage less than 10 V?

Repair the power supply short circuit of harness between ECM and electronic throttle control.

25.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM.

3) Measure the resistance between electronic throttle control connector and engine ground.

Connector & terminal

(E57) No. 3 — Engine ground:

(E57) No. 6 — Engine ground:

Is the resistance more than 1 MΩ?

Repair the short circuit of harness.

26.CHECK ELECTRONIC THROTTLE CONTROL MOTOR HARNESS.

Measure the resistance between electronic throttle control connector terminals.

Connector & terminal

(E57) No. 3 — (E57) No. 6:

Is the resistance more than 1 MΩ?

Repair the short circuit of harness.

27.CHECK ELECTRONIC THROTTLE CONTROL GROUND CIRCUIT.

Measure the resistance between ECM connector and chassis ground.

Connector & terminal

(B137) No. 1 — Chassis ground:

(B134) No. 6 — Chassis ground:

Is the resistance less than 10 Ω?

Repair the open circuit of the harness.

28.CHECK ELECTRONIC THROTTLE CONTROL.

Measure the resistance between electronic throttle control terminals.

Terminals

No. 3 — No. 6:

Is the resistance less than 50 Ω?

Replace the electronic throttle control.

29.CHECK ELECTRONIC THROTTLE CONTROL.

Move the throttle valve to the fully open and fully closed positions with fingers.

Check that 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 of ECM connector. Replace the ECM if defective.

Replace the electronic throttle control.