Without Scan Tool

EXHAUST GAS RECIRCULATION (EGR) VALVE FUNCTION (DTC: P0400)
Instead of performing DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CONDITION, the following method can be used for checking the EGR function. (The "NG" of the OVERALL FUNCTION CHECK means the same as the DTC detection.)




For The Above Malfunction b)
1) Disconnect the rubber tube to EGR control solenoid valve , which comes from throttle body.
2) Disconnect the rubber tube to fuel pressure regulator, which comes from intake manifold.
3) Connect the solenoid valve and intake manifold with rubber tube. (The intake manifold vacuum will be directly applied to the solenoid valve.)




4) Confirm the voltage between Engine Control Module (ECM) terminal 59 and 25 is higher than 2.24 volts.
Perform the following steps before the voltage becomes lower than 2.24 volts.
5) Start engine.




6) Check for the EGR valve lifting when racing up to 2,000 rpm through 4,000 rpm under no load.
EGR valve should be closed and should not lift up.