DTC P138C [MZ-CD 1.6 (Y6) (EURO4 emission level)]

id0102g6837000

DTC P138C

Air bypass valve position sensor minimum/maximum stop
DETECTION CONDITION
•  The PCM learns the air bypass valve position based on the air bypass valve position sensor signal. If the learning value of the air bypass valve position is under any of the following conditions, the PCM determines that there is a malfunction in the air bypass valve position sensor signal.
―  Difference between the initial value of the air bypass valve position exceeds 55 %
―  Difference between the latest air bypass valve position exceeds 13 %
POSSIBLE CAUSE
•  EGR valve base value reset procedure improperly
•  EGR throttle valve base value reset procedure improperly
•  Air bypass valve stuck in open or closed position
•  Air bypass valve position sensor malfunction
•  Air bypass valve actuator 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?
―  P0033, P022A, P022B, P022C, P024A, P024B, P024E, P024F, P0488, P1402, P1412
Yes
Go to the applicable DTC inspection.
(See DTC P0033 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P022A [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P022B [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P022C [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P024A [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P024B [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P024E [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P024F [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0488 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1402 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1412 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
Go to the next step.
4
PERFORM EGR VALVE BASE VALUE RESET AND EGR THROTTLE VALVE BASE VALUE RESET
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the EGR VALVE ADAPTIVE VALUE RESET and EGR THROTTLE VALVE BASE VALUE RESET procedures.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Troubleshooting is completed.
Go to Step 7.
5
VISUALLY INSPECT AIR BYPASS VALVE FOR CONTAMINATION
•  Remove the EGR throttle valve component.
•  Visually inspect air bypass valve.
•  Is there any contamination?
Yes
Clean the air bypass valve, then go to Step 7.
No
Go to the next step.
6
INSPECT AIR BYPASS VALVE POSITION SENSOR
•  Inspect the air bypass valve position sensor.
•  Is there any malfunction?
Yes
Replace the air bypass valve component, then go to the next step.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
No
Go to the next step.
7
VERIFY THAT DTC P138C 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.
8
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.