Home

Mazdamanuals.com

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

id0102t5159900

Outline

System malfunction location

Duty signal error in HP-EGR control valve control system

Detection condition

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

―  HP-EGR control system: During control

―  Any one of the following conditions is met

•  Boost air temperature: 30 °C {86 °F} or more

•  Intake air temperature: 30 °C {86 °F} or more

•  Engine coolant temperature: 70 °C {158 °F} or more

―  The following DTCs are not detected

•  HP-EGR control valve position sensor: P0405:00, P0406:00

•  HP-EGR control valve DC motor control system: P0404:00

•  HP-EGR control valve control device in PCM: P16A1:00

•  ECT sensor: P0117:00, P0118:00

Fail-safe

•  PCM restricts engine torque.

•  Inhibits the DENOx/DESOx control.

•  Inhibits the diesel particulate filter regeneration control.

•  Inhibits the EGR control.

•  Inhibits engine-stop by operating the i-stop function.

Possible cause

•  HP-EGR control valve connector or terminal malfunction

•  PCM connector or terminal malfunction

•  Short circuit in HP-EGR control valve control circuits

•  HP-EGR control valve malfunction

―  HP-EGR control valve sticking, operation malfunction

―  HP-EGR control valve freezing

―  HP-EGR control valve foreign matter penetration

•  PCM malfunction

System malfunction location	Duty signal error in HP-EGR control valve control system
Detection condition	• With the following conditions met, the HP-EGR control valve control duty value is 90 % or more for a continuous 2 s. ― HP-EGR control system: During control ― Any one of the following conditions is met • Boost air temperature: 30 °C {86 °F} or more • Intake air temperature: 30 °C {86 °F} or more • Engine coolant temperature: 70 °C {158 °F} or more ― The following DTCs are not detected • HP-EGR control valve position sensor: P0405:00, P0406:00 • HP-EGR control valve DC motor control system: P0404:00 • HP-EGR control valve control device in PCM: P16A1:00 • ECT sensor: P0117:00, P0118:00
Fail-safe	• PCM restricts engine torque. • Inhibits the DENOx/DESOx control. • Inhibits the diesel particulate filter regeneration control. • Inhibits the EGR control. • Inhibits engine-stop by operating the i-stop function.
Possible cause	• HP-EGR control valve connector or terminal malfunction • PCM connector or terminal malfunction • Short circuit in HP-EGR control valve control circuits • HP-EGR control valve malfunction ― HP-EGR control valve sticking, operation malfunction ― HP-EGR control valve freezing ― HP-EGR control valve foreign matter penetration • PCM malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

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.

2

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.

3

INSPECT HP-EGR CONTROL VALVE 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.

4

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.

5

INSPECT EACH WIRING HARNESS OF HP-EGR CONTROL VALVE/HP-EGR control VALVE POSITION SENSOR CIRCUIT FOR SHORT CIRCUIT

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

•  Is the circuit normal?

Yes

Go to repair completion verification.

No

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

6

INSPECT HP-EGR CONTROL VALVE FOR MALFUNCTION

•  Inspect the applicable part.
(See HP-EGR CONTROL VALVE 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 HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

7

INSPECT HP-EGR CONTROL VALVE FOR FOREIGN MATTER

•  Remove the HP-EGR control valve.
(See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

•  Inspect the HP-EGR control valve for foreign matter.

•  Is there foreign matter in the HP-EGR control valve?

Yes

Remove any foreign matter from the HP-EGR control valve, then go to repair completion verification.

No

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.

―  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 {22 mph} 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 {31 mph} and drive the vehicle while maintaining the speed for 50 s.

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

•  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
1	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.
2	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.
2		No	Go to the next step.
3	INSPECT HP-EGR CONTROL VALVE CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	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.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT EACH WIRING HARNESS OF HP-EGR CONTROL VALVE/HP-EGR control VALVE POSITION SENSOR CIRCUIT FOR SHORT CIRCUIT • Inspect the applicable circuits for a short circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to repair completion verification.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT HP-EGR CONTROL VALVE FOR MALFUNCTION • Inspect the applicable part. (See HP-EGR CONTROL VALVE INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
7	INSPECT HP-EGR CONTROL VALVE FOR FOREIGN MATTER • Remove the HP-EGR control valve. (See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) • Inspect the HP-EGR control valve for foreign matter. • Is there foreign matter in the HP-EGR control valve?	Yes	Remove any foreign matter from the HP-EGR control valve, then go to repair completion verification.
7		No	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. ― 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 {22 mph} 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 {31 mph} and drive the vehicle while maintaining the speed for 50 s. 6. Stop the vehicle and idle the engine for 20 s. • 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	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.