1. DTC P0123 description
The intake throttle position sensor is installed to the intake throttle valve body together with the motor. The intake throttle position sensor changes the signal voltage in accordance with the intake throttle valve opening position. The sensor has the following circuits.
- 5 V reference circuit
- Low reference circuit
- Intake throttle position sensor signal circuit
The intake throttle position sensor sends signals related to intake throttle valve position changes to the ECM via the signal circuit. If the ECM detects an excessively high signal voltage, the DTC is set.
2. Condition for setting DTC P0123
Condition for running the DTC
- The battery voltage is 9 to 16 V.
- DTC P060B is not set.
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P060B (Flash Code 36) Internal Control Module A/D Processing Performance".
Condition for setting the DTC
- The ECM detects that the intake throttle position sensor signal voltage is 4.9 V or more.
3. Action taken when DTC P0123 sets
- Euro4: The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A (Euro4).
- Except Euro4: The ECM illuminates the check engine warning light. Refer to Action taken when DTC sets - Type A (Except Euro4).
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".
- The ECM inhibits pre-injection.
- The ECM limits the fuel rail pressure.
- The ECM inhibits the cruise control.
4. Condition for clearing DTC P0123
- Euro4: Refer to Condition for clearing the MIL/DTC - Type A or Type B (Euro4).
- Except Euro4: Refer to Condition for clearing the check engine warning light/DTC - Type A or Type B (Except Euro4).
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".