ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

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

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Engine stalls.

• Poor driving performance

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode , and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM and electronic throttle control.

3) Measure the resistance between ECM and chassis ground.

Connector & terminal

(B137) No. 25 — Chassis ground:

(B137) No. 23 — Chassis ground:

(B137) No. 23 — (B136) No. 22:

Is the resistance 1 MΩ or more?

Repair the short circuit to ground in harness between ECM and electronic throttle control connector.

2.CHECK SHORT CIRCUIT INSIDE THE ECM.

1) Connect the connector to ECM.

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

Connector & terminal

(E57) No. 5 — Engine ground:

Is the resistance 1 MΩ or more?

Replace the electronic throttle control.

Repair the short circuit to ground in harness between ECM and electronic throttle control connector. Replace the ECM if defective.