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DTC P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D”/“E” VOLTAGE RATIONALITY

DTC P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D”/“E” VOLTAGE RATIONALITY

DTC DETECTING CONDITION:


• Immediately at fault recognition

• GENERAL DESCRIPTION


TROUBLE SYMPTOM:


• Erroneous idling

• Poor driving performance


Important

After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .


WIRING DIAGRAM:


CHECK OUTPUT VOLTAGE OF ACCELERATOR POSITION SENSOR.

Turn the ignition switch to ON.

Read the data of main and sub accelerator position sensor signals using Vehicle Diagnostic Interface.

Is the measured value more than 0.4 V?

Yes


No


CHECK POOR CONTACT IN CONNECTORS.

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

Is there any poor contact in connectors between ECM and electronic throttle control?

Yes

Repair the poor contact in connectors.


No


CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Disconnect the connector from accelerator position sensor.

Measure the resistance between ECM connector and accelerator position sensor connector.

Connector & terminal

(B136) No. 17 — (B315) No. 5:

(B136) No. 15 — (B315) No. 3:

(B136) No. 28 — (B315) No. 2:

(B136) No. 16 — (B315) No. 1:

Is the measured value less than 1 Ω?

Yes


No

Repair the open harness connector.


CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR.

Measure the resistance between ECM connector and chassis ground.

Connector & terminal

(B136) No. 17 — Chassis ground:

(B136) No. 15 — Chassis ground:

(B136) No. 28 — Chassis ground:

(B136) No. 16 — Chassis ground:

Is the measured value more than 1 MΩ?

Yes


No

Repair the ground short of harness.


CHECK POWER SUPPLY TO ACCELERATOR POSITION SENSOR.

Connect the ECM connector.

Turn the ignition switch to ON.

Measure the voltage between accelerator position sensor connector and engine ground.

Connector & terminal

(B315) No. 3 (+) — Engine ground (−):

(B315) No. 1 (+) — Engine ground (−):

Is the measured value within 4.5 to 5.5 V?

Yes


No

Repair the poor contact in ECM connector. If problem persists, replace the ECM.


CHECK ACCELERATOR POSITION SENSOR.

Measure the resistance of accelerator position sensor.

Terminals

No. 3 — No. 4:

Is the measured value within 1.2 to 4.8 kΩ?

Yes


No

Replace the accelerator position sensor.


CHECK ACCELERATOR POSITION SENSOR.

Measure the resistance of accelerator position sensor.

Terminals

No. 1 — No. 6:

Is the measured value within 0.75 to 3.15 kΩ?

Yes


No

Replace the accelerator position sensor.


CHECK ACCELERATOR POSITION SENSOR.

Measure the resistance of accelerator position sensor when the acceleration pedal is released.

Terminals

No. 5 — No. 4:

Is the measured value within 0.2 to 0.8 kΩ?

Yes


No

Replace the accelerator position sensor.


CHECK ACCELERATOR POSITION SENSOR.

Measure the resistance of accelerator position sensor when the acceleration pedal is released.

Connector & terminal

No. 2 — No. 6:

Is the measured value within 0.15 to 0.63 kΩ?

Yes


No

Replace the accelerator position sensor.


CHECK ACCELERATOR POSITION SENSOR.

Measure the resistance of accelerator position sensor when the acceleration pedal is being depressed.

Terminals

No. 5 — No. 4:

Is the measured value within 0.5 to 2.5 kΩ?

Yes


No

Replace the accelerator position sensor.


CHECK ACCELERATOR POSITION SENSOR.

Measure the resistance of accelerator position sensor when the acceleration pedal is being depressed.

Terminals

No. 2 — No. 6: (Sub)

Is the measured value within 0.28 to 1.68 kΩ?

Yes


No

Replace the accelerator position sensor.


CHECK OUTPUT VOLTAGE OF ACCELERATOR POSITION SENSOR.

Turn the ignition switch to OFF.

Connect all the connectors.

Turn the ignition switch to ON.

Read the data of main accelerator position sensor signals and sub accelerator position sensor signals, using Vehicle Diagnostic Interface.

Is the measured value less than 4.8 V?

Yes


No


CHECK POOR CONTACT IN CONNECTORS.

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

Is there any poor contact in connectors between ECM and electronic throttle control?

Yes

Repair the poor contact in connectors.


No


CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Disconnect the connector from accelerator position sensor.

Measure the resistance between ECM connector and accelerator position sensor connector.

Connector & terminal

(B136) No. 34 — (B315) No. 4:

(B136) No. 35 — (B315) No. 6:

Is the measured value less than 1 Ω?

Yes


No

Repair the open harness connector.


CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR.

Connect the ECM connector.

Measure the resistance between accelerator position sensor and chassis ground.

Connector & terminal

(B315) No. 4 — Chassis ground:

(B315) No. 6 — Chassis ground:

Is the measured value less than 5 Ω?

Yes


No

Repair the poor contact in ECM connector. If problem persists, replace the ECM.


CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR.

Connect the ECM connector.

Turn the ignition switch to ON.

Measure the voltage between accelerator position sensor and chassis ground.

Connector & terminal

(B315) No. 5 (+) — Chassis ground (−):

(B315) No. 2 (+) — Chassis ground (−):

Is the measured value less than 6 V?

Yes


No

Repair the battery short of harness between ECM connector and accelerator position sensor.


CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Measure the resistance between ECM connectors.

Connector & terminal

(B136) No. 17 — (B136) No. 15:

(B136) No. 17 — (B136) No. 16:

(B136) No. 28 — (B136) No. 15:

(B136) No. 28 — (B136) No. 16:

Is the measured value more than 1 MΩ?

Yes


No

Repair the short to sensor power supply.


CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Disconnect the connector from accelerator position sensor.

Measure the resistance between terminals of accelerator position sensor connector.

Connector & terminal

(B315) No. 5 — (B315) No. 2:

Is the measured value more than 1 MΩ?

Yes

Repair the poor contact in ECM connector. If problem persists, replace the ECM.


No

Repair the short of harness between accelerator position sensor connector and accelerator position sensor connector.