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DTC P2123 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D” CIRCUIT HIGH INPUT

DTC P2123 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D” CIRCUIT HIGH INPUT

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 accelerator position sensor signals, using Vehicle Diagnostic Interface.

Is the voltage less than 4.8 V?

Yes


No


CHECK POOR CONTACT IN CONNECTORS.

Check poor contact in connectors between ECM and accelerator position sensor.

Is there any poor contact in connectors between ECM and accelerator position sensor?

Yes

Repair the poor contact in connectors.


No

Connector has returned to its normal condition at this time. A temporary poor contact in the connector might have been the cause.


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 & terminal

(B136) No. 34 — (B315) No. 4:

Is the resistance 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:

Is the resistance 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 connector and chassis ground.

Connector & terminal

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

Is the voltage 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. 28 — (B136) No. 15:

(B136) No. 28 — (B136) No. 16:

Is the resistance more than 1 MΩ?

Yes

Repair the poor contact in electronic throttle control connector. If problem persists, replace the electronic throttle control.


No

Repair the short to sensor power supply.