1. DTC P0490 description
The ECM controls the opening position of the EGR valve based on the driving condition of the engine by controlling the EGR motor. The EGR valve lift amount is detected by the position sensor and is sent to the ECM. If the ECM detects a failure in the EGR motor circuit, the DTC is set.
2. Condition for setting DTC P0490
Condition for running the DTC
- The battery voltage is 9 to 16 V.
Condition for setting the DTC
The ECM detects any of the following for 1.3 seconds or more.
- Short to ground in EGR motor circuit
- Short to the battery power supply circuit or short to the ignition power supply circuit in the EGR motor circuit
3. Action taken when DTC P0490 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 limits the fuel injection quantity.
- The ECM inhibits pre-injection.
- The ECM limits the fuel rail pressure.
- The ECM inhibits the cruise control.
4. Condition for clearing DTC P0490
- 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".