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EC-1228
[YD (WITH EURO-OBD)]
DTC P0401 EGR FUNCTION
3. CHECK EGR VOLUME CONTROL VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals and EGR volume control valve terminals as follows.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK EGR VOLUME CONTROL VALVE
Refer to EC-1229, "
Component Inspection" .
OK or NG
OK >> GO TO 5.
NG >> Replace EGR volume control valve.
5. CHECK EGR PASSAGE
Check the following for clogging and cracks.
● EGR tube
● EGR hose
● EGR cooler
OK or NG
OK >> GO TO 6.
NG >> Repair or replace EGR passage.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-1058, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
ECM terminal EGR volume control valve terminal
25 1
26 6
27 3
28 4
Continuity should exist.
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