DTC P0406:00 [SKYACTIV-D 2.2]

id0102s4155500

DTC P0406:00

EGR valve position sensor circuit high input

DETECTION CONDITION

•  If the input voltage at the PCM terminal 1AQ is more than 4.86 V for 2 s, the PCM determines that the EGR valve position sensor circuit is high.

MONITORING CONDITIONS

―  Battery voltage: 8 V or more

―  0.5 s have elapsed after the ignition was switched ON (engine off or on)

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 (Mode 2)/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  PCM restricts engine torque.

•  Inhibits the two-stage turbo control.

•  Inhibits the EGR control.

•  Inhibits the diesel particulate filter regeneration control.

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

•  PCM restricts engine-transaxle integration control.

POSSIBLE CAUSE

•  EGR valve/EGR valve position sensor connector or terminals malfunction

•  PCM connector or terminals malfunction

•  Short to power supply in wiring harness between EGR valve/EGR valve position sensor terminal D and PCM terminal 1AQ

•  EGR valve position sensor power supply circuit and signal circuit are shorted to each other

•  Open circuit in wiring harness between the following terminals:

―  EGR valve/EGR valve position sensor terminal D—PCM terminal 1AQ

―  EGR valve/EGR valve position sensor terminal C—PCM terminal 1AO

•  EGR valve position sensor malfunction

•  PCM malfunction

DTC P0406:00	EGR valve position sensor circuit high input
DETECTION CONDITION	• If the input voltage at the PCM terminal 1AQ is more than 4.86 V for 2 s, the PCM determines that the EGR valve position sensor circuit is high. MONITORING CONDITIONS ― Battery voltage: 8 V or more ― 0.5 s have elapsed after the ignition was switched ON (engine off or on) 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 (Mode 2)/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• PCM restricts engine torque. • Inhibits the two-stage turbo control. • Inhibits the EGR control. • Inhibits the diesel particulate filter regeneration control. • Inhibits engine-stop by operating the i-stop function. • PCM restricts engine-transaxle integration control.
POSSIBLE CAUSE	• EGR valve/EGR valve position sensor connector or terminals malfunction • PCM connector or terminals malfunction • Short to power supply in wiring harness between EGR valve/EGR valve position sensor terminal D and PCM terminal 1AQ • EGR valve position sensor power supply circuit and signal circuit are shorted to each other • Open circuit in wiring harness between the following terminals: ― EGR valve/EGR valve position sensor terminal D—PCM terminal 1AQ ― EGR valve/EGR valve position sensor terminal C—PCM terminal 1AO • EGR valve position sensor malfunction • PCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then 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 EGR VALVE/EGR VALVE POSITION SENSOR CONNECTOR CONDITION • Switch the ignition off. • Disconnect the EGR valve/EGR valve position sensor 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 9.
3		No	Go to the next step.
4	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 9.
4		No	Go to the next step.
5	INSPECT EGR VALVE POSITION SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the EGR valve/EGR valve position sensor and PCM connectors are disconnected. • Switch the ignition ON (engine off). • Measure the voltage at the EGR valve/EGR valve position sensor terminal D (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between EGR valve/EGR valve position sensor terminal D and PCM terminal 1AQ. 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. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 9.
6	INSPECT EGR VALVE POSITION SENSOR POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT TO EACH OTHER • Verify that the EGR valve/EGR valve position sensor and PCM connectors are disconnected. • Switch the ignition off. • Inspect for continuity between EGR valve/EGR valve position sensor terminals B and D (wiring harness-side). • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • EGR valve/EGR valve position sensor terminal B—PCM terminal 1AP • EGR valve/EGR valve position sensor terminal D—PCM terminal 1AQ 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 each other. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to each other. Go to Step 9.
6		No	Go to the next step.
7	INSPECT EGR VALVE POSITION SENSOR CIRCUIT FOR OPEN CIRCUIT • Verify that the EGR valve/EGR valve position sensor and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― EGR valve/EGR valve position sensor terminal D—PCM terminal 1AQ ― EGR valve/EGR valve position sensor terminal C—PCM terminal 1AO • Is there continuity?	Yes	Go to the next step.
7		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • EGR valve/EGR valve position sensor terminal D—PCM terminal 1AQ • EGR valve/EGR valve position sensor terminal C—PCM terminal 1AO 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 9.
8	INSPECT EGR VALVE POSITION SENSOR • Reconnect all disconnected connectors. • Inspect the EGR valve position sensor. (See EGR VALVE POSITION SENSOR INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunction?	Yes	Replace the EGR valve, then go to the next step. (See EGR VALVE REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
8		No	Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 2.2].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [SKYACTIV-D 2.2].) • 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 2.2].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 2.2].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 2.2].)
10		No	DTC troubleshooting completed.