DTC P0406:00 [MZR-CD (RF Turbo)]

id0102f1155500

DTC P0406:00

EGR valve position sensor circuit high input
DETECTION CONDITION
•  The PCM monitors input voltage from EGR position sensor when the ignition switch is ON position. If input voltage is more than 4.9 V, the PCM determines that the EGR valve position sensor circuit has a malfunction.
Diagnostic support note
•  The MIL illuminates if the PCM detects the above malfunction condition in first drive cycle.
•  PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA is available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  EGR valve position sensor malfunction
•  Connector or terminal malfunction
•  Open circuit between EGR valve terminal C and PCM terminal 70
•  Short to constant voltage supply between EGR valve terminal E and PCM terminal 53

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
•  If vehicle is not repaired, go to the next step.
No
Go to the next step.
3
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
•  Is DTC P0406:00 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to troubleshooting procedures for DTC in FREEZE FRAME DATA.
(See DTC TABLE [MZR-CD (RF Turbo)].)
4
INSPECT EGR VALVE CONNECTOR FOR POOR CONNECTION
•  Disconnect the EGR valve connector.
•  Inspect for poor connection (such as damaged, pulled-out terminals, corrosion).
•  Is there any malfunction?
Yes
Repair or replace suspected terminal, then go to Step 10.
No
Go to the next step.
5
INSPECT EGR VALVE POSITION SENSOR
•  Perform EGR valve position sensor inspection.
•  Is the EGR valve position sensor normal?
Yes
Go to the next step.
No
Replace the EGR valve, then go to Step 10.
(See EGR VALVE REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
6
INSPECT EGR VALVE POSITION SENSOR SIGNAL FOR SHORT TO POWER SUPPLY
•  Switch the ignition to ON (engine off).
•  Measure voltage between EGR valve terminal E (wiring harness-side) and body ground.
•  Is voltage more than 4.9V?
Yes
Repair or replace for short to power supply.Then, go to Step 10.
No
Go to the next step.
7
VERIFY EGR VALVE POSITION SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  inspect for continuity at wiring harness-side connector between EGR valve terminal C and PCM terminal 70.
•  Is there any continuity?
Yes
Go to the next step.
No
Repair or replace for open circuit.
Then go to Step 10.
8
INSPECT PCM CONNECTORS FOR POOR CONNECTION
•  Switch the ignition to off.
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 10.
No
Go to the next step.
9
VERIFY EGR POSITION SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT
•  inspect for continuity at EGR valve wiring harness side connector between terminal A and E.
•  Is there continuity?
Yes
Repair or replace for short circuit, then go to the next step.
No
Go to the next step.
10
VERIFY TROUBLESHOOTING OF DTC P0406:00 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Switch the ignition to ON (engine off).
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
•  Perform “AFTER REPAIR PROCEDURE”.
•  Is any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR-CD (RF Turbo)].)
No
Troubleshooting completed.