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DTC P2122 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D” CIRCUIT LOW INPUT

DTC P2122 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D” CIRCUIT LOW 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 signal using Vehicle Diagnostic Interface.

Connector & terminal

(B136) No. 2 (+) — (B135) No. 18 (−):

Is the voltage more than 0.4 V?

Yes


No


CHECK POOR CONTACT IN CONNECTORS.

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

Is there 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 of the connector may be 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. 17 — (B315) No. 5:

(B135) No. 15 — (B315) No. 3:

Is the resistance 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:

(B135) No. 15 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair the open harness connector.


CHECK ACCELERATOR POSITION SENSOR POWER SUPPLY

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. 3 (+) — Chassis ground (−):

Is the voltage 4.5 — 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 resistance 1.2 — 4.8 kΩ?

Yes


No

Replace the accelerator position sensor.


CHECK ACCELERATOR POSITION SENSOR.

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

Terminals

No. 5 — No. 4:

Is the resistance 0.2 — 1.0 kΩ?

Yes


No

Replace the accelerator position sensor.


CHECK ACCELERATOR POSITION SENSOR.

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

Terminals

No. 5 — No. 4:

Is the resistance 0.5 — 2.5 kΩ?

Yes

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


No

Replace the accelerator position sensor.