DTC P2123: Throttle/Pedal Position Sensor/Switch "D" Circuit High [11/2021 - ]: Procedure

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Disconnect the connector from the accelerator pedal (with sensor) rod assembly.
4. Measure the resistance of harness between ECM connector and accelerator pedal (with sensor) rod assembly connector.

   Connector & terminal

   A5-55 (AVSS3) - A17-5

   A5-66 (ACCM) - A17-6

   Is the resistance less than 1 Ω?

   Result	Proceed to
   Yes	A
   No (Repair the open circuit of harness between ECM connector and accelerator pedal (with sensor) rod assembly connector.)	B

Result: 

B 

REPAIR HARNESS 

Result: 

A 

See step  2

1. Connect the connector to ECM.
2. Measure the resistance between accelerator pedal (with sensor) rod assembly connector and chassis ground.

   Connector & terminal

   A17-5 - Chassis ground

   Is the resistance less than 5 Ω?

   Result	Proceed to
   Yes	A
   No (Repair the following item.) Open circuit in harness between ECM connector and ground Poor contact of ECM connector	B

Result: 

B 

REPAIR RELATED PARTS 

Result: 

A 

See step  3

1. Turn the ignition to ON.
2. Measure the voltage between accelerator pedal (with sensor) rod assembly connector and chassis ground.

   Connector & terminal

   A17-6 - Chassis ground

   Is the voltage 5 V or higher?

   Result	Proceed to
   Yes (Repair the short circuit to power supply in harness between ECM connector and accelerator pedal (with sensor) rod assembly connector.)	A
   No	B

Result: 

A 

REPAIR HARNESS 

Result: 

B 

See step  4

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance between ECM connectors.

   Connector & terminal

   A5-51 (AVCC3) - A5-66 (ACCM)

   Is the resistance 1 MΩ or more?

   Result	Proceed to
   Yes (Repair the poor contact of accelerator pedal (with sensor) rod assembly connector.)	A
   No (Repair the short circuit between lines in harness between ECM connector and accelerator pedal (with sensor) rod assembly connector.)	B

Result: 

B 

REPAIR HARNESS 

Result: 

A 

See step  5

Result

Result: 

NEXT 

CHECK ACCELERATOR PEDAL (WITH SENSOR) ROD ASSEMBLY 

Refer to ON-VEHICLE INSPECTION [11/2021 - ]