Generic Scan Tool

ON-BOARD DIAGNOSIS LOGIC
If the absence of Exhaust Gas Recirculation (EGR) flow is detected by EGR temperature sensor under the condition that calls for EGR, a low-flow malfunction is diagnosed.
If the EGR temperature sensor detects EGR flow under the condition that does not call for EGR, a high-flow malfunction is diagnosed.




EXHAUST GAS RECIRCULATION 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 & canister 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 engine coolant temperature is lower than 52°C (126°F) in "Mode 1" with Generic Scan Tool (GST). Perform the following steps before its temperature becomes higher than 52°C (126°F).
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.