DTC: P1402

Search Bulletins/Recalls for P1402

Trouble diagnosis name: EGR function (Open)

System Description

This system controls flow rate of EGR led from exhaust manifold to intake manifold. The opening of the EGR by-pass passage in the EGR volume control valve changes to control the flow rate. A built-in step motor moves the valve in steps corresponding to the ECM output pulses. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. The EGR volume control valve remains closed under the following conditions.

• Engine stopped
• Engine starting
• Engine idling
• Low engine coolant temperature
• Excessively high engine coolant temperature
• High engine speed
• Wide open throttle
• Low battery voltage

DTC detecting condition:

• EGR flow is detected under the condition that does not call for EGR.

Possible cause:

• Harness or connectors (The EGR volume control valve circuit is open or shorted.)
• EGR volume control valve leaking or stuck open
• EGR temperature sensor