DTC P0404:00 [SKYACTIV-D 1.5]

id0102q2155300

DTC P0404:00

Circuit malfunction in HP-EGR control valve DC motor control system
DETECTION CONDITION
•  With the following conditions met, a condition has continued for 2 s in which the DC motor drive current of the HP-EGR control valve is more than the specified value or the temperature of the DC motor drive circuit is 175 °C {347 °F} or more.
MONITORING CONDITIONS
―  The following DTCs are not detected:
•  PCM internal processor malfunction: P0606:00
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
•  PCM restricts engine torque.
•  Inhibits the auto DPF regeneration control.
•  Inhibits the compulsory DPF regeneration control.
•  Inhibits the EGR control.
•  PCM restricts engine-transaxle integration control. (ATX)
•  Inhibits engine-stop by operating the i-stop function.
POSSIBLE CAUSE
•  HP-EGR control valve connector or terminals malfunction
•  Short to ground in wiring harness between the following terminals:
―  HP-EGR control valve terminal E—PCM terminal 1BH
―  HP-EGR control valve terminal A—PCM terminal 1BC
•  PCM connector or terminals malfunction
•  Short to power supply in wiring harness between the following terminals:
―  HP-EGR control valve terminal E—PCM terminal 1BH
―  HP-EGR control valve terminal A—PCM terminal 1BC
•  HP-EGR control valve 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 FREEZE FRAME DATA/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.
No
Go to the next step.
3
INSPECT HP-EGR CONTROL VALVE CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the HP-EGR control valve 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 8.
No
Go to the next step.
4
INSPECT HP-EGR CONTROL VALVE CIRCUIT FOR SHORT TO GROUND
•  Verify that the HP-EGR control valve connector is disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  HP-EGR control valve terminal E
―  HP-EGR control valve terminal A
•  Is there continuity?
Yes
Disconnect the PCM connector and inspect the wiring harness for short to ground.
•  If the short to ground circuit could be detected in the wiring harness:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  HP-EGR control valve terminal E—PCM terminal 1BH
•  HP-EGR control valve terminal A—PCM terminal 1BC
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.
•  If the short to ground circuit could not be detected in the wiring harness:
―  Replace the PCM (short to ground in the PCM internal circuit).
Go to Step 8.
No
Go to the next step.
5
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 8.
No
Go to the next step.
6
INSPECT HP-EGR CONTROL VALVE CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the HP-EGR control valve 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 following terminals (wiring harness-side):
―  HP-EGR control valve terminal E
―  HP-EGR control valve terminal A
•  Is the voltage 0 V?
Yes
Go to the next step.
No
If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  HP-EGR control valve terminal E—PCM terminal 1BH
•  HP-EGR control valve terminal A—PCM terminal 1BC
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 8.
7
INSPECT HP-EGR CONTROL VALVE
•  Inspect the HP-EGR control valve.
•  Is there any malfunction?
Yes
Replace the HP-EGR control valve, then go to the next step.
(See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
No
Go to the next step.
8
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Always reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the KOEO or KOER self test.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [SKYACTIV-D 1.5].)
No
DTC troubleshooting completed.