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

DTC P2135 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A”/“B” VOLTAGE CORRELATION

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

CAUTION:

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

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK SENSOR OUTPUT.

1) Turn the ignition switch to ON.

2) 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 0.4 V or more?

2.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 0.8 V or more?

3.CHECK POOR CONTACT.

Check poor contact in connector between ECM and electronic throttle.

Is there poor contact?

Repair the poor contact.

4.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE.

1) Turn the ignition switch to OFF.

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

3) Measure the resistance between ECM connector and electronic throttle 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 between ECM and electronic throttle.

5.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE.

Measure the resistance between ECM connector and chassis ground.

Connector & terminal

(B137) No. 23 — Chassis ground:

(B137) No. 24 — Chassis ground:

(B137) No. 25 — Chassis ground:

Is the resistance 1 MΩ or more?

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

6.CHECK SENSOR POWER SUPPLY.

1) Connect the ECM connector.

2) Turn the ignition switch to ON.

3) Measure the voltage between electronic throttle 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.

7.CHECK SHORT CIRCUIT IN ECM.

1) Turn the ignition switch to OFF.

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

Connector & terminal

(E57) No. 5 — Engine ground:

(E57) No. 2 — Engine ground:

Is the resistance 10 Ω or more?

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

8.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 less than 4.63 V?

9.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 less than 4.73 V?

10.CHECK POOR CONTACT.

Check poor contact in connector between ECM and electronic throttle.

Is there poor contact?

Repair the poor contact.

Temporary poor contact occurred, but it is normal at present.

11.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE.

1) Turn the ignition switch to OFF.

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

3) Measure the resistance between ECM connector and electronic throttle 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 between ECM and electronic throttle.

12.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE.

1) Connect the ECM connector.

2) Measure the resistance between electronic throttle 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.

13.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE.

1) Connect the ECM connector.

2) Turn the ignition switch to ON.

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

Connector & terminal

(E57) No. 4 (+) — Engine ground (−):

Is the voltage less than 10 V?

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

14.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE.

Measure the voltage between electronic throttle 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 to power supply in harness between ECM connector and electronic throttle connector.

15.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE.

1) Turn the ignition switch to OFF.

2) Disconnect the ECM connector.

3) Measure the resistance between ECM connectors.

Connector & terminal

(B137) No. 23 — (B137) No. 25:

(B137) No. 24 — (B137) No. 25:

Is the resistance 1 MΩ or more?

Repair the short circuit to sensor power supply.

16.CHECK ELECTRONIC THROTTLE HARNESS.

1) Disconnect the connectors from the ECM and electronic throttle.

2) Measure the resistance between electronic throttle connector terminals.

Connector & terminal

(E57) No. 5 — (E57) No. 2:

Is the resistance 1 MΩ or more?

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

Repair the short circuit of harness.