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DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT HIGH INPUT

DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT HIGH INPUT

DTC DETECTING CONDITION:


• Immediately at fault recognition

• GENERAL DESCRIPTION


TROUBLE SYMPTOM:


• Erroneous idling

• Engine stalls.

• Poor driving performance


Important

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


WIRING DIAGRAM:


CHECK SENSOR OUTPUT.

Turn the ignition switch to ON.

Read the data of main throttle sensor signal using Vehicle Diagnostic Interface.

Is the voltage less than 4.63 V?

Yes


No


CHECK POOR CONTACT.

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

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

Yes

Repair the poor contact.


No

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


CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Disconnect the connectors from electronic throttle control.

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

Connector & terminal

(B136) No. 18 — (E57) No. 6:

Is the resistance less than 1 Ω?

Yes


No

Repair the open circuit of harness connector.


CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

Connect the ECM connector.

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

Connector & terminal

(E57) No. 3 — Engine ground:

Is the resistance less than 1 Ω?

Yes


No

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


CHECK SENSOR OUTPUT POWER SUPPLY.

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

Connector & terminal

(E57) No. 6 (+) — Engine ground (−):

Is the voltage less than 10 V?

Yes


No

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


CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Measure the resistance between ECM connectors.

Connector & terminal

(B136) No. 18 — (B136) No. 16:

Is the resistance more than 1 MΩ?

Yes

Repair poor contact in harness. Repair the electronic throttle control.


No

Repair short circuit to sensor power supply.