DTC P253F:00 [PCM (SKYACTIV-D)]

System malfunction location	Engine oil system: Engine oil deterioration
Detection condition	• When any of the following conditions is met. Note • The PCM determines that the engine oil has deteriorated due to an engine oil pressure decrease. Dilution of the oil from fuel becoming mixed in can be considered a cause of the engine oil pressure decrease. ― The amount of engine oil dilution exceeds the specification (fluctuates by ambient temperature). ― With the following conditions met, the engine oil pressure decreases 110 kPa {1.12 kgf/cm², 16.0 psi} or more compared to when the engine oil was replaced. • Engine speed: 1,475—1,525 rpm • Engine oil temperature: 87—88 °C{189—190 °F}
Fail-safe	• Not applicable
Possible cause	• Engine oil pressure sensor malfunction • Engine oil temperature sensor malfunction • Frequent, automatic diesel particulate filter regeneration control is performed and engine oil is diluted • The engine oil data reset was not performed after the engine oil replacement. • Oil viscosity lowered due to engine oil deterioration • PCM malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

System malfunction location

Engine oil system: Engine oil deterioration

Detection condition

• When any of the following conditions is met.

Note

• The PCM determines that the engine oil has deteriorated due to an engine oil pressure decrease. Dilution of the oil from fuel becoming mixed in can be considered a cause of the engine oil pressure decrease.

― The amount of engine oil dilution exceeds the specification (fluctuates by ambient temperature).

― With the following conditions met, the engine oil pressure decreases 110 kPa {1.12 kgf/cm², 16.0 psi} or more compared to when the engine oil was replaced.

• Engine speed: 1,475—1,525 rpm

• Engine oil temperature: 87—88 °C{189—190 °F}

Fail-safe

• Not applicable

Possible cause

• Engine oil pressure sensor malfunction

• Engine oil temperature sensor malfunction

• Frequent, automatic diesel particulate filter regeneration control is performed and engine oil is diluted

• The engine oil data reset was not performed after the engine oil replacement.

• Oil viscosity lowered due to engine oil deterioration

• PCM malfunction

System wiring diagram

• Not applicable

Connector diagram

• Not applicable

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	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?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
3	INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D)].)
No	Go to the next step.
4	INSPECT ENGINE OIL PRESSURE SENSOR FOR MALFUNCTION • Inspect the applicable part. (See ENGINE OIL PRESSURE SENSOR INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
5	INSPECT ENGINE OIL TEMPERATURE SENSOR FOR MALFUNCTION • Inspect the applicable part. (See ENGINE OIL TEMPERATURE SENSOR INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
6	REPLACE ENGINE OIL • Replace the engine oil. (See ENGINE OIL REPLACEMENT [SKYACTIV-D 1.8].)	—	Implement the engine oil data reset procedure. (See ENGINE OIL DATA RESET [SKYACTIV-D 1.8].) Go to the next step.
Repair completion verification 1	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. Warning • To prevent an accident, work with another person when the vehicle is being driven (one person drives vehicle, other person operates M-MDS). • Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured. ― Start the engine and drive the vehicle under the freeze frame data/snapshot data condition. • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) 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. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

• Record the freeze frame data/snapshot data.

Note

• Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

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?

Yes

Perform repair or diagnosis according to the available information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT FOR OTHER RELATED DTCs

• Perform the DTC inspection for the PCM.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-D)].)

Go to the next step.

INSPECT ENGINE OIL PRESSURE SENSOR FOR MALFUNCTION

• Inspect the applicable part.

(See ENGINE OIL PRESSURE SENSOR INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

INSPECT ENGINE OIL TEMPERATURE SENSOR FOR MALFUNCTION

• Inspect the applicable part.

(See ENGINE OIL TEMPERATURE SENSOR INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

REPLACE ENGINE OIL

• Replace the engine oil.

(See ENGINE OIL REPLACEMENT [SKYACTIV-D 1.8].)

—

Implement the engine oil data reset procedure.

(See ENGINE OIL DATA RESET [SKYACTIV-D 1.8].)

Go to the next step.

Repair completion verification 1

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.

Warning

• To prevent an accident, work with another person when the vehicle is being driven (one person drives vehicle, other person operates M-MDS).

• Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured.

― Start the engine and drive the vehicle under the freeze frame data/snapshot data condition.

• Perform the DTC inspection for the PCM.

(See DTC INSPECTION.)

• Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

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.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

• Perform the DTC inspection.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

DTC troubleshooting completed.

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