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DTC U0284:00 [PCM (SKYACTIV-D)]

id0102t5910400

Note

• To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

Description

LIN communication system: Communication error between active air shutter and PCM

Detection condition

Determination conditions

•  PCM detects a communication error between the active air shutter and PCM.

Preconditions

•  The following conditions continue for 1.5 s:

―  Battery voltage: 10 V ^*1or more

―  Switch the ignition ON (engine off or on)

^*1: Standard can be verified by displaying PIDs using M-MDS

Malfunction determination period

•  5 s period

Drive cycle

•  1

Self test type

•  CMDTC self test

Sensor used

•  PCM

Fail-safe function

•  Not applicable

Vehicle status when DTCs are output

•  The active air shutter cannot be controlled, therefore it is constantly open.

Possible cause

•  LIN communication line malfunction between active air shutter and PCM

Description	LIN communication system: Communication error between active air shutter and PCM
Detection condition	Determination conditions	• PCM detects a communication error between the active air shutter and PCM.
Preconditions	• The following conditions continue for 1.5 s: ― Battery voltage: 10 V ^1or more ― Switch the ignition ON (engine off or on) ^1: Standard can be verified by displaying PIDs using M-MDS
Malfunction determination period	• 5 s period
Drive cycle	• 1
Self test type	• CMDTC self test
Sensor used	• PCM
Fail-safe function	• Not applicable
Vehicle status when DTCs are output	• The active air shutter cannot be controlled, therefore it is constantly open.
Possible cause	• LIN communication line malfunction between active air shutter and PCM

Function Explanation (DTC Detection Outline)

• The PCM detects a DTC when there is a LIN communication error with the PCM and active air shutter.

Repeatability Verification Procedure

1. Switch the ignition ON (engine off or on) and wait for 10 s or more.

PID Item/Simulation Item Used In Diagnosis

• Not applicable

Function Inspection Using M-MDS

Step

Inspection

Results

Action

1

PURPOSE: 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.

2

PURPOSE: 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.

3

PURPOSE: VERIFY 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.

Step	Inspection	Results	Action
1	PURPOSE: 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.
2	PURPOSE: 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.
3	PURPOSE: VERIFY 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.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure

• Step 1—5

― Perform an inspection of the connectors and wiring harnesses between the active air shutter and the PCM.

• Repair completion verification

― Verify that the primary malfunction is resolved and there are no other malfunctions.

Step

Inspection

Results

Action

2

PURPOSE: INSPECT ACTIVE AIR SHUTTER CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

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

2

PURPOSE: INSPECT PCM CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

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

3

PURPOSE: INSPECT ACTIVE AIR SHUTTER LIN COMMUNICATION LINE FOR SHORT TO GROUND

•  Inspect the applicable circuit for a short to ground.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

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

4

PURPOSE: INSPECT ACTIVE AIR SHUTTER LIN COMMUNICATION LINE FOR OPEN CIRCUIT

•  Inspect the applicable circuit for open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

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

5

PURPOSE: INSPECT ACTIVE AIR SHUTTER FOR MALFUNCTION

•  Inspect the applicable part.
(See ACTIVE AIR SHUTTER INSPECTION.)

•  Is the part normal?

Yes

Go to the next step.

No

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

(See ACTIVE AIR SHUTTER REMOVAL/INSTALLATION.)

Repair completion verification 1

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.

―  Implement the repeatability verification procedure.
(See Repeatability Verification Procedure.)

•  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

PURPOSE: 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
2	PURPOSE: INSPECT ACTIVE AIR SHUTTER CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
2	PURPOSE: INSPECT PCM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	PURPOSE: INSPECT ACTIVE AIR SHUTTER LIN COMMUNICATION LINE FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	PURPOSE: INSPECT ACTIVE AIR SHUTTER LIN COMMUNICATION LINE FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	PURPOSE: INSPECT ACTIVE AIR SHUTTER FOR MALFUNCTION • Inspect the applicable part. (See ACTIVE AIR SHUTTER INSPECTION.) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ACTIVE AIR SHUTTER REMOVAL/INSTALLATION.)
Repair completion verification 1	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. ― Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • 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].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	PURPOSE: 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.
Repair completion verification 2		No	DTC troubleshooting completed.