DTC P0400 [WL-3]
id0102b8954600
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DTC P0400 |
EGR system malfunction |
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DETECTION CONDITION
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• The PCM monitors the EGR valve position sensor signal at PCM terminal 1F. If the voltage at PCM terminal 1F is below 0.66 V when the engine is idling, the PCM determines that the EGR system has a malfunction.
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POSSIBLE CAUSE
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• EGR valve malfunction
• EGR solenoid valve (vacuum) malfunction
• EGR solenoid valve (vent) malfunction
• EGR control solenoid valve malfunction
• PCM malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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2
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VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Clear the DTC.
• Start the engine.
• Is the same DTC present?
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Yes
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Go to the next step.
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No
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Intermittent concern exists.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
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3
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INSPECT FOR RELATED SOLENOID VALVES
• Inspect for following solenoid valves.
• Are solenoid valves normal?
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Yes
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Go to the next step.
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No
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Replace suspect solenoid valves, then go to the next step.
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4
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INSPECT VACUUM HOSE CONDITION
• Inspect vacuum hoses for clogging, damage, freeze, or vacuum leakage.
• Is there any concern?
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Yes
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Replace vacuum hoses, then go to Step 6.
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No
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Go to the next step.
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5
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INSPECT EGR VALVE MALFUNCTION
• Turn the engine switch to the off position.
• Remove the EGR valve.
• Inspect the EGR valve.
(See EGR VALVE INSPECTION [WL-3].)
• Is the EGR valve normal?
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Yes
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Go to the next step.
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No
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Replace the EGR valve, then go to Step 6.
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6
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VERIFY TROUBLESHOOTING OF DTC P0400 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the engine switch to the ON position (Engine off).
• Clear the DTC from the memory using the M-MDS.
• Start the engine.
• Warm-up the engine until the ECT PID is above 70 °C {158 °F}.
• Is the same DTC present?
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Yes
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Go to the next step.
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No
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Replace the PCM, then go to the next step.
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7
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VERIFY AFTER REPAIR PROCEDURE
• Perform “AFTER REPAIR PROCEDURE”
• Is there any DTC present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [WL-3].)
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No
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Troubleshooting completed.
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