DTC P0138:00 [PCM (SKYACTIV-D)]
id0102t5702600
Details On DTCs
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Description |
NOx sensor (oxygen concentration) circuit high input |
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Detection condition
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Determination conditions
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• The oxygen concentration output by NOx sensor exceeds the specification for a continuous 0.5 s.
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Preconditions
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• NOx sensor is activating
• Ignition has been switched ON (engine on) for 20 s or more
• Battery voltage: 10.9—16 V
• The following DTCs are not detected:
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Malfunction determination period
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• 0.5 s
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Drive cycle
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• 1
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Self test type
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• CMDTC self test
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Sensor used
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• NOx sensor
• PCM
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Fail-safe
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• Inhibits the DENOx/DESOx control.
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Vehicle status when DTCs are output
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• Not applicable
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Possible cause
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• NOx sensor connector or terminals malfunction
• PCM connector or terminals malfunction
• NOx sensor malfunction
• PCM malfunction
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System Wiring Diagram
Function Explanation (DTC Detection Outline)
Repeatability Verification Procedure
1. Perform the “COMPULSORY DIESEL PARTICULATE FILTER REGENERATION”. (See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 1.8].)
2. Idle the engine for 3 min.
PID Item/Simulation Item Used In Diagnosis
Function Inspection Using M-MDS
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Step |
Inspection |
Results |
Action |
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1
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RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
• Record the freeze frame data/snapshot data.
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—
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Go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY
• Verify related Service Bulletins, on-line repair information, or Service Information availability.
• Is any related Information available?
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Yes
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Perform repair or diagnosis according to the available 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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3
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PURPOSE: VERIFY IF DIAGNOSTIC RESULT IS AFFECTED BY OTHER RELATED DTCs OCCURRING
• Switch the ignition off, then ON (engine off).
• Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)
• Are any of the following DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.
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Troubleshooting Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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PURPOSE: DETERMINE INTEGRITY OF NOx sensor
• Inspect the NOx sensor.
• Is there any malfunction?
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Yes
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Replace the NOx sensor, then go to the next step.
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No
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Go to the next step.
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Repair completion verification 1
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PURPOSE: VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Clear the DTC recorded in the memory.
(See CLEARING DTC.)
• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.
• Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)
• Is the same Pending DTC present?
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Yes
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the PCM, then go to the next step.
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No
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Go to the next step.
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Repair completion verification 2
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PURPOSE: VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection.
(See DTC INSPECTION.)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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