DTC detecting condition

Trouble area

P2123: Throttle / Pedal Position Sensor / Switch “D” Circuit High

Output voltage of APP sensor (main) signal circuit is higher than 4.4 V.

(1 D/C detection logic)

• APP sensor (main) and/or its circuit

• ECM

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” performed?

Go to Step 2.

Go to “Engine and

Emission Control

System Check”.

2

APP sensor (main) power supply circuit check

1) When ignition is “OFF”, disconnect APP sensor

connector.

2) Check for proper terminal connection to APP sensor connector.

3) If connections are OK, set ignition “ON”.

4) Check that voltage between “A1” and “A3” is approx. 5 V.

Is check result OK?

Go to Step 4.

Go to Step 3.

3

APP sensor (main) ground circuit check

1) Check that voltage between “A1” and ground is approx.

5 V.

Is check result OK?

Repair “A3” circuit.

Check “A1” circuit.

If defective circuit is

found, repair “A1”

circuit

If circuit is OK, replace

ECM and recheck DTC.

4

APP sensor (main) signal circuit check

1) When ignition is “OFF”, disconnect “C01” and “E01” connectors from ECM.

2) Check for proper terminal connection to “C01” and “E01” connectors.

3) If connections are OK, check the following points.

• Resistance of “A2” circuit: less than 1Ω

• Resistance between “A2” circuit and ground: infinity

• Resistance between “A2” circuit terminal and other terminal at APP sensor connector: infinity

• Voltage of “A2” circuit: approx. 0 V (When ignition is “ON”)

Is check result OK?

Go to Step 5.

Repair “A2” circuit.

5

APP sensor check

1) Check APP sensor.

Is check result OK?

Replace ECM and recheck DTC.

Replace accelerator

pedal assembly

(incorporated with APP sensor).