ENGINE (DIAGNOSTICS)(H4DOTC) > 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. 31 and No. 32 of electronic throttle control relay.

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

Terminals

No. 29 — No. 30:

Is the resistance less than 1 Ω?

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

(B220) No. 29 (+) — Chassis ground (−):

Is the voltage 10 V or more?

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

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

1) Disconnect the connectors from the ECM.

2) Turn the ignition switch to ON.

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

Connector & terminal

(B220) No. 32 (+) — Chassis ground (−):

Is the voltage 10 V or more?

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

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

(B220) No. 32 — Chassis ground:

(B220) No. 30 — Chassis ground:

Is the resistance 1 MΩ or more?

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 the ECM and electronic throttle control relay connector.

Connector & terminal

(B136) No. 21 — (B220) No. 32:

(B136) No. 1 — (B220) No. 30:

Is the resistance less than 1 Ω?

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

6.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from electronic throttle control.

3) Measure the resistance between ECM and chassis ground.

Connector & terminal

(B134) No. 19 — Chassis ground:

(B134) No. 18 — Chassis ground:

(B134) No. 18 — (B136) No. 6:

(B134) No. 28 — Chassis ground:

Is the resistance 1 MΩ or more?

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

7.CHECK SHORT CIRCUIT INSIDE THE ECM.

1) Connect the connector to ECM.

2) 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 1 MΩ or more?

Repair the ground short circuit of harness between ECM and electronic throttle control connector. Replace the ECM if defective.

8.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Disconnect the connectors from the ECM.

2) Measure the resistance of harness between ECM and electronic throttle control connector.

Connector & terminal

(B134) No. 18 — (E57) No. 6:

(B134) No. 28 — (E57) No. 4:

(B134) No. 29 — (E57) No. 3:

Is the resistance less than 1 Ω?

Repair the harness and connector.

NOTE:

In this case, repair the following items.

• Open circuit in harness between ECM and electronic throttle control connector

• Poor contact of coupling connector

9.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Connect the connector to ECM.

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

Connector & terminal

(E57) No. 3 — Engine ground:

Is the resistance less than 5 Ω?

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit of harness between ECM and engine ground

• Poor contact in ECM connector

• Poor contact of coupling connector

10.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. 6 (+) — Engine ground (−):

(E57) No. 4 (+) — Engine ground (−):

Is the voltage 4.85 V or more?

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

11.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from the ECM.

3) Measure the resistance between ECM connectors.

Connector & terminal

(B134) No. 19 — (B134) No. 18:

(B134) No. 19 — (B134) No. 28:

Is the resistance 1 MΩ or more?

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

12.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 procedures, refer to “READ CURRENT DATA FOR ENGINE”.

Is the voltage 0.81 — 0.87 V?

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

13.CHECK SENSOR OUTPUT.

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

NOTE:

Subaru Select Monitor

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

Is the voltage 1.64 — 1.70 V?

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

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

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM and electronic throttle control.

3) Measure the resistance between ECM 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 Ω?

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

15.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. 2 (+) — Engine ground (−):

(E57) No. 1 (+) — Engine ground (−):

Is the voltage 5 V or more?

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

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

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from the ECM.

3) 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 1 MΩ or more?

Repair the short circuit to ground in harness between ECM and electronic throttle control.

17.CHECK ELECTRONIC THROTTLE CONTROL MOTOR HARNESS.

Measure the resistance between the electronic throttle control connector terminals.

Connector & terminal

(E57) No. 2 — (E57) No. 1:

Is the resistance 1 MΩ or more?

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

18.CHECK ELECTRONIC THROTTLE CONTROL GROUND CIRCUIT.

Measure the resistance between ECM and chassis ground.

Connector & terminal

(B134) No. 5 — Chassis ground:

(B137) No. 1 — Chassis ground:

(B137) No. 2 — Chassis ground:

(B137) No. 3 — Chassis ground:

(B137) No. 7 — Chassis ground:

Is the resistance less than 5 Ω?

Repair the open circuit of the harness between the ECM and engine ground.

19.CHECK ELECTRONIC THROTTLE CONTROL.

Measure the resistance between electronic throttle control terminals.

Terminals

No. 2 — No. 1:

Is the resistance 50 Ω or less?

Replace the electronic throttle control.

20.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 the ECM connector.

Replace the electronic throttle control.