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P0403 Mitsubishi

P0403 Mitsubishi - Exhaust Gas Recirculation Control Circuit

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P0403 Mitsubishi Comments |  Add Comment
Possible causes
- Faulty EGR volume control solenoid valve
- EGR volume control solenoid valve harness is open or shorted
- EGR volume control solenoid valve circuit poor electrical connection
- EGR temperature sensor and circuit
Help with Possible causes What does this mean?
When is the code detected?
An improper voltage signal is sent to ECM through the valve
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
P0403 Mitsubishi Description

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.

The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.

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