With Consult

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.)

Before starting with the following procedure, check the engine coolant temperature of the freeze frame data with CONSULT or Generic Scan Tool (GST).

^ If the engine coolant temperature is higher than or equal to 70°C (158°F), perform only "For the above malfunction a".

^ If the engine coolant temperature is lower than 70°C (158°F), perform both "For the above malfunction a" and "For the above malfunction b".




For The Above Malfunction a)
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) Start engine.




5) Select "EGRC SOLENOID VALVE" in "ACTIVE TEST" mode with CONSULT and turn the solenoid valve "OFF".




6) Check the EGR valve lifting when racing up to 2,000 rpm through 4,000 rpm under no load.
EGR valve should lift up and down without sticking.
7) Warm up engine sufficiently.




8) Check voltage between EGR temperature sensor harness connector terminal 1 and ground at idle speed.
Less than 4.5 volts should exist.




9) Turn ignition switch "OFF".
Check harness continuity between EGR temperature sensor harness connector terminal 2 and Engine Control Module (ECM) terminal 43.
Continuity should exist.
10) Perform the Testing and Inspection Procedures for EGR Temperature Sensor.

OR




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) Disconnect EGR control solenoid valve harness connector.
[The DTC for EGR control solenoid valve will be displayed, however, ignore it.]
5) Start engine.




6) Check the EGR valve lifting when racing up to 2,000 rpm through 4,000 rpm under no load.
EGR valve should lift up and down without sticking.
7) Reconnect its harness connector.
8) Warm up engine sufficiently.




9) Check voltage between EGR temperature sensor harness connector terminal 1 and ground at idle speed.
Less than 4.5 volts should exist.




10) Turn ignition switch "OFF". Check harness continuity between EGR temperature sensor harness connector terminal 2 and ECM terminal 43. Continuity should exist.




11) Perform the Testing and Inspection Procedures for EGR Temperature Sensor.




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) Start engine.




5) Select "EGRC SOLENOID VALVE" in "ACTIVE TEST" mode with CONSULT and turn the solenoid valve "ON".




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.