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DTC P0122 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT LOW INPUT

DTC P0122 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT LOW 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 more than 0.4 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:

(B136) No. 16 — (E57) No. 5:

Is the resistance less than 1 Ω?

Yes


No

Repair the open circuit of harness connector.


CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.

Measure the resistance between ECM connector and chassis ground.

Connector & terminal

(B136) No. 18 — Chassis ground:

(B136) No. 16 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair the chassis short circuit of harness.


CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL.

Connect the ECM connector.

Turn the ignition switch to ON.

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

Connector & terminal

(E57) No. 5 (+) — Engine ground (−):

Is the voltage 4.5 — 5.5 V?

Yes


No

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


CHECK SHORT CIRCUIT INSIDE THE ECM.

Turn the ignition switch to OFF.

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

Connector & terminal

(E57) No. 6 — Engine ground:

Is the resistance more than 10 Ω?

Yes

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


No

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