DTC P0488:00 [PCM (SKYACTIV-D 2.2)]

id0102j5159900

DTC P0488:00

Duty signal error in EGR valve control system

DETECTION CONDITION

•  With the following conditions met, the EGR valve control duty value is 90% or more for a continuous 2 s.

―  EGR system: During control

―  Any one of the following conditions is met

•  Boost air temperature: 30 °C or more

•  Intake air temperature: 30 °C or more

•  Engine coolant temperature: 70 °C or more

―  The following DTCs are not detected

•  EGR valve position sensor: P0405:00, P0406:00

•  EGR valve DC motor control system: P0404:00

•  EGR valve control device in PCM: P16A1:00

•  ECT sensor: P0117:00, P0118:00

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

•  FREEZE FRAME DATA/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  Limits engine torque.

•  Inhibits the automatic diesel particulate filter regeneration control.

•  Inhibits the manual diesel particulate filter regeneration control.

•  Inhibits the EGR control.

•  Inhibits engine-stop by i-stop control.

POSSIBLE CAUSE

•  EGR valve connector or terminal malfunction

•  PCM connector or terminal malfunction

•  Short circuit in each wiring harness of EGR valve

•  EGR valve malfunction

―  EGR valve sticking, operation malfunction

―  EGR valve freezing

―  EGR valve foreign matter penetration

•  PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable

DTC P0488:00	Duty signal error in EGR valve control system
DETECTION CONDITION	• With the following conditions met, the EGR valve control duty value is 90% or more for a continuous 2 s. ― EGR system: During control ― Any one of the following conditions is met • Boost air temperature: 30 °C or more • Intake air temperature: 30 °C or more • Engine coolant temperature: 70 °C or more ― The following DTCs are not detected • EGR valve position sensor: P0405:00, P0406:00 • EGR valve DC motor control system: P0404:00 • EGR valve control device in PCM: P16A1:00 • ECT sensor: P0117:00, P0118:00 Diagnostic support note • This is a continuous monitor (CCM). • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Limits engine torque. • Inhibits the automatic diesel particulate filter regeneration control. • Inhibits the manual diesel particulate filter regeneration control. • Inhibits the EGR control. • Inhibits engine-stop by i-stop control.
POSSIBLE CAUSE	• EGR valve connector or terminal malfunction • PCM connector or terminal malfunction • Short circuit in each wiring harness of EGR valve • EGR valve malfunction ― EGR valve sticking, operation malfunction ― EGR valve freezing ― EGR valve foreign matter penetration • PCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

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

Note

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

•  Record the freeze frame data/snap shot data.

—

Go to the next step.

2

INSPECT EGR VALVE CONNECTOR CONDITION

•  Switch the ignition OFF.

•  Disconnect the EGR valve connector.

•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 7.

3

INSPECT PCM CONNECTOR CONDITION

•  Disconnect the PCM connector.

•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 7.

4

INSPECT EACH WIRING HARNESS OF EGR VALVE/EGR VALVE POSITION SENSOR CIRCUIT FOR SHORT CIRCUIT

•  Verify that the EGR valve/EGR valve position sensor connector and the PCM connector are disconnected.

•  Switch the ignition OFF.

•  Inspect for continuity between EGR valve/EGR valve position sensor terminals A and E (vehicle wiring harness side).

•  Is there continuity?

Yes

Refer to the wiring diagram and verify if there is a common connector between the following terminals.

•  EGR valve/EGR valve position sensor terminal A and PCM terminal 1BM

If there is a common connector:

―  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short circuit to determine the malfunctioning location.

―  Repair or replace the malfunctioning location.

If there is no common connector:

―  Repair or replace the malfunctioning wiring harness.

Go to Step 6.

No

Replace the EGR valve, then go to the next step.

(See EGR VALVE REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

5

INSPECT EGR VALVE

•  Inspect the EGR valve.
(See EGR VALVE INSPECTION [SKYACTIV-D 2.2].)

•  Is the EGR valve normal?

Yes

Go to the next step.

No

Replace the EGR valve, then go to Step 7.

(See EGR VALVE REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

6

INSPECT EGR VALVE FOR FOREIGN MATTER

•  Remove the EGR valve.
(See EGR VALVE REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

•  Inspect the EGR valve for foreign matter.

•  Is there foreign matter in the EGR valve?

Yes

Remove any foreign matter from the the EGR valve, then go to the next step.

No

Go to the next step.

7

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  Reconnect all the disconnected connectors.

•  Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC.
(See CLEARING DTC [PCM (SKYACTIV-D 2.2)].)

•  Drive the vehicle on flat roads under the following conditions 5 times repeatedly.

1.  Start the engine and warm it up.

2.  Idle the engine for 20 s.

3.  Accelerate in 2nd gear to 35 km/h and drive the vehicle while maintaining the speed for 25 s.

4.  Stop the vehicle and idle the engine for 20 s.

5.  Accelerate in 3rd gear to 50 km/h and drive the vehicle while maintaining the speed for 50 s.

6.  Stop the vehicle and idle the engine for 20 s.

•  Display the DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].)

•  Has DTC P0488:00 been recorded?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

No

Go to the next step.

8

VERIFY OTHER DTCs

•  Has any other DTC or pending code been stored?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-D 2.2)].)

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the freeze frame data/snap shot data.	—	Go to the next step.
2	INSPECT EGR VALVE CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the EGR valve connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 7.
3	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
3		No	Repair or replace the connector, then go to Step 7.
4	INSPECT EACH WIRING HARNESS OF EGR VALVE/EGR VALVE POSITION SENSOR CIRCUIT FOR SHORT CIRCUIT • Verify that the EGR valve/EGR valve position sensor connector and the PCM connector are disconnected. • Switch the ignition OFF. • Inspect for continuity between EGR valve/EGR valve position sensor terminals A and E (vehicle wiring harness side). • Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • EGR valve/EGR valve position sensor terminal A and PCM terminal 1BM If there is a common connector: ― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short circuit to determine the malfunctioning location. ― Repair or replace the malfunctioning location. If there is no common connector: ― Repair or replace the malfunctioning wiring harness. Go to Step 6.
4		No	Replace the EGR valve, then go to the next step. (See EGR VALVE REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
5	INSPECT EGR VALVE • Inspect the EGR valve. (See EGR VALVE INSPECTION [SKYACTIV-D 2.2].) • Is the EGR valve normal?	Yes	Go to the next step.
5		No	Replace the EGR valve, then go to Step 7. (See EGR VALVE REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
6	INSPECT EGR VALVE FOR FOREIGN MATTER • Remove the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) • Inspect the EGR valve for foreign matter. • Is there foreign matter in the EGR valve?	Yes	Remove any foreign matter from the the EGR valve, then go to the next step.
6		No	Go to the next step.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)].) • Drive the vehicle on flat roads under the following conditions 5 times repeatedly. 1. Start the engine and warm it up. 2. Idle the engine for 20 s. 3. Accelerate in 2nd gear to 35 km/h and drive the vehicle while maintaining the speed for 25 s. 4. Stop the vehicle and idle the engine for 20 s. 5. Accelerate in 3rd gear to 50 km/h and drive the vehicle while maintaining the speed for 50 s. 6. Stop the vehicle and idle the engine for 20 s. • Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) • Has DTC P0488:00 been recorded?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
7		No	Go to the next step.
8	VERIFY OTHER DTCs • Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
8		No	DTC troubleshooting completed.