DTC U0284:00 [SKYACTIV-D 1.5]

id0102q2910400

DTC U0284:00

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

DETECTION CONDITION

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

Diagnostic support note

•  This is an intermittent monitor (other).

•  The check engine light does not illuminate.

•  FREEZE FRAME DATA is not available.

•  Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  Stops active air shutter control.

POSSIBLE CAUSE

•  LIN communication line malfunction between active air shutter and PCM

•  Active air shutter connector or terminals malfunction

•  Short to ground or open circuit in active air shutter power supply circuit

―  Short to ground in wiring harness between ENGINE3 15 A fuse and active air shutter terminal A

―  ENGINE3 15 A fuse malfunction

―  Open circuit in wiring harness between main relay terminal D and active air shutter terminal A

•  Open circuit in wiring harness between active air shutter terminal D and body ground

•  PCM connector or terminals malfunction

•  Short to ground in wiring harness between active air shutter terminal C and PCM terminal 1Q

•  Short to power supply in wiring harness between active air shutter terminal C and PCM terminal 1Q

•  Open circuit in wiring harness between active air shutter terminal C and PCM terminal 1Q

•  Active air shutter malfunction

•  PCM malfunction

DTC U0284:00	LIN communication system: Communication error between active air shutter and PCM
DETECTION CONDITION	• PCM detects a communication error between the PCM and active air shutter. Diagnostic support note • This is an intermittent monitor (other). • The check engine light does not illuminate. • FREEZE FRAME DATA is not available. • Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Stops active air shutter control.
POSSIBLE CAUSE	• LIN communication line malfunction between active air shutter and PCM • Active air shutter connector or terminals malfunction • Short to ground or open circuit in active air shutter power supply circuit ― Short to ground in wiring harness between ENGINE3 15 A fuse and active air shutter terminal A ― ENGINE3 15 A fuse malfunction ― Open circuit in wiring harness between main relay terminal D and active air shutter terminal A • Open circuit in wiring harness between active air shutter terminal D and body ground • PCM connector or terminals malfunction • Short to ground in wiring harness between active air shutter terminal C and PCM terminal 1Q • Short to power supply in wiring harness between active air shutter terminal C and PCM terminal 1Q • Open circuit in wiring harness between active air shutter terminal C and PCM terminal 1Q • Active air shutter malfunction • PCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the snapshot data on the repair order.	—	Go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT ACTIVE AIR SHUTTER CONNECTOR CONDITION • Switch the ignition off. • Disconnect the active air shutter connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 11.
3		No	Go to the next step.
4	INSPECT ACTIVE AIR SHUTTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Verify that the active air shutter connector is disconnected. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the active air shutter terminal A (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
4		No	Inspect the ENGINE3 15 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between ENGINE3 15 A fuse and active air shutter terminal A. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • Replace the fuse. • If the fuse is damaged: ― Replace the fuse. • If the fuse is normal: ― Refer to the wiring diagram and verify whether or not there is a common connector between main relay terminal D and active air shutter terminal A. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 11.
5	INSPECT ACTIVE AIR SHUTTER GROUND CIRCUIT FOR OPEN CIRCUIT • Verify that the active air shutter connector is disconnected. • Switch the ignition off. • Inspect for continuity between active air shutter terminal D (wiring harness-side) and body ground. • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between active air shutter terminal D and body ground. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Inspect for the following: ― Open circuit between active air shutter and body ground ― Loose or lifting ground point • Repair or replace the malfunctioning part. Go to Step 11.
6	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 11.
6		No	Go to the next step.
7	INSPECT ACTIVE AIR SHUTTER SIGNAL CIRCUIT FOR SHORT TO GROUND • Verify that the active air shutter and PCM connectors are disconnected. • Inspect for continuity between active air shutter terminal C (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between active air shutter terminal C and PCM terminal 1Q. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 11.
7		No	Go to the next step.
8	INSPECT ACTIVE AIR SHUTTER SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the active air shutter and PCM connectors are disconnected. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the active air shutter terminal C (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
8		No	If there is no common connector: Refer to the wiring diagram and verify whether or not there is a common connector between active air shutter terminal C and PCM terminal 1Q. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. • Repair or replace the wiring harness which has a short to power supply. Go to Step 11.
9	INSPECT ACTIVE AIR SHUTTER SIGNAL CIRCUIT FOR OPEN CIRCUIT • Verify that the active air shutter and PCM connectors are disconnected. • Switch the ignition off. • Inspect for continuity between active air shutter terminal C (wiring harness-side) and PCM terminal 1Q (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
9		No	Refer to the wiring diagram and verify whether or not there is a common connector between active air shutter terminal C and PCM terminal 1Q. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 11.
10	INSPECT ACTIVE AIR SHUTTER • Inspect the active air shutter. (See ACTIVE AIR SHUTTER INSPECTION.) • Is there any malfunction?	Yes	Replace the active air shutter, then go to the next step. (See ACTIVE AIR SHUTTER REMOVAL/INSTALLATION.)
10		No	Go to the next step.
11	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-D 1.5].) • Start the engine. • Drive the vehicle at 10 km/h {6.2 mph} or more for approx. 1 min. • Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 1.5].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to the next step.
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 1.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 1.5].)
12		No	DTC troubleshooting completed.