DTC P1402 [MZ-CD 1.6 (Y6) (EURO4 emission level)]

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DTC P1402

EGR metering orifice restricted
DETECTION CONDITION
•  The PCM monitors the EGR valve position when the valve is fully closed based on the EGR valve position sensor signal. If any of the following conditions occurs during EGR valve full-close control, the PCM determines that the EGR metering orifice is clogged.
―  Difference between the initial value of the EGR valve fully-closed position before learning exceeds 14 %
―  Difference between the EGR valve fully-closed position after learning exceeds 8 %
POSSIBLE CAUSE
•  EGR valve adaptive value reset procedure improperly
•  MAP sensor improper installation
•  EGR valve position sensor malfunction
•  EGR throttle valve malfunction
•  EGR valve or pipe restriction or clogging
•  MAP sensor characteristic malfunction
•  EGR valve malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE AND/OR DTC
•  Switch the ignition to off, then to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the following PENDING CODE/DTC also present?
―  P0403, P0405, P0406, P042E, P042F, P0488, P0489, P0490, P2141, P2142, P2227, P2228, P2229
Yes
Go to the applicable DTC inspection.
(See DTC P0403 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0405 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0406 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P042E [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P042F [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0488 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0489 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0490 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P2141 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P2142 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P2227 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P2228 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P2229 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
Go to the next step.
4
PERFORM EGR VALVE ADAPTIVE VALUE RESET
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the EGR VALVE BASE VALUE RESET.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Go to Step 11.
5
VERIFY MAP SENSOR INSTALLATION
•  Verify MAP sensor installation.
•  Is the MAP sensor installed properly?
Yes
Go to the next step.
No
Install the MAP sensor properly, then go to Step 10.
6
INSPECT EGR VALVE POSITION SENSOR
•  Inspect the EGR valve position sensor.
•  Is there any malfunction?
Yes
Replace the EGR valve, then go to Step 10.
(See EGR VALVE REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
No
Go to the next step.
7
INSPECT EGR THROTTLE VALVE
•  Inspect the EGR throttle valve for following:
―  Mechanical stuck
•  Is there any malfunction?
Yes
Clean or replace the EGR throttle valve component, then go to Step 10.
No
Go to the next step.
8
INSPECT EGR VALVE AND PIPE PASSAGE
•  Remove the EGR valve.
•  Inspect the EGR valve and pipe for following:
―  Mechanical stuck
―  Restriction
•  Is there any malfunction?
Yes
Repair or replace malfunctioning part according to inspection result, then go to Step 10.
No
Go to the next step.
9
INSPECT MAF SENSOR
•  Inspect the MAF sensor.
•  Is there any malfunction?
Yes
Replace the MAF/IAT sensor, then go to the next step.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
No
Replace the EGR valve, then go to the next step.
(See EGR VALVE POSITION SENSOR INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
10
VERIFY THAT DTC P1402 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
DTC troubleshooting completed.