DTC P0122: Throttle/Pedal Position Sensor/Switch "A" Circuit Low: Notes
DTC detecting condition:
Immediately at fault recognition
Trouble symptom:
- Improper idling
- Engine stalls.
- Poor driving performance
- After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (H6DO)>CLEAR MEMORY MODE>OPERATION ., and inspection mode Ref. to ENGINE (DIAGNOSTICS) (H6DO)>INSPECTION MODE>PROCEDURE .
- Use the check board when measuring the ECM terminal voltage and resistance.
Wiring diagram:
Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .
- 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 chassis ground.
Connector & terminal
(E158) No. 32 - Chassis ground:
(E158) No. 29 - Chassis ground:
(E158) No. 29 - (E158) No. 19:
Is the resistance 1 MΩ or more?
Yes Go to 2 .
No Repair the ground short circuit of harness between ECM connector and electronic throttle control connector.
- CHECK SHORT CIRCUIT INSIDE THE ECM.
- Connect the connector to ECM.
- Measure the resistance between electronic throttle control connector and engine ground.
Connector & terminal
(E57) No. 6 - Engine ground:
Is the resistance 1 MΩ or more?
Yes Replace the electronic throttle control. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H6DO)>THROTTLE BODY .
No Repair the ground short circuit of harness between ECM connector and electronic throttle control connector. Replace the ECM if defective. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H6DO)>ENGINE CONTROL MODULE (ECM) .