ECD SYSTEM, Diagnostic DTC:P0405, P0406
| DTC Code | DTC Name |
|---|---|
| P0405 | Short to GND in EGR Valve Position Sensor Circuit |
| P0406 | Open or Short to B+ in EGR Valve Position Sensor Circuit |
DESCRIPTION
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The ECM adjusts the opening angle of the EGR valve and throttle valve (for EGR) to control the EGR (Exhaust Gas Recirculation) amount to reduce emissions.
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When the EGR valve is closed, there is no EGR flow. (fig. 1)
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When the EGR valve is opened, exhaust gas flows to the intake manifold. (fig. 2)
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The EGR position sensor is Hall Type (No variable resistance).
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The voltage output is proportional to the position of the valve.
| DTC No. | DTC Detection Condition | Trouble Area | Possible to Detect | |
|---|---|---|---|---|
| Ignition Switch | Engine Run | |||
| P0405 | The output voltage from the EGR position sensor (EGLS terminal) remains more than 0.25 V for 2 sec. or more. (3 trip detection logic) |
|
ON | ON |
| P0406 | The output voltage from the EGR position sensor (EGLS terminal) remains more than 4.75 V for 2 sec. or more. (3 trip detection logic) |
|
ON | ON |
FAIL-SAFE
| DTC No. | Fail-safe Operation | Fail-safe Deactivation Condition |
|---|---|---|
| P0405 | Stops the EGR. | Next engine start. |
| P0406 | Stops the EGR. | Next engine start. |
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
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If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.
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Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).
PROCEDURE
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CHECK HARNESS AND CONNECTOR (EGR VALVE - ECM)
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Disconnect the B53 ECM connector.
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Disconnect the B39 EGR valve connector.
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Measure the resistance according to the value(s) in the table below.
Standard resistance Check for open Tester Connection Specified Condition VEGLS (B53-4) - VEGLS (B39-1) Below 1 Ω EGLS (B53-23) - EGLS (B39-4) Below 1 Ω EEGLS (B53-36) - EEGLS (B39-5) Below 1 Ω Check for short Tester Connection Specified Condition VEGLS (B53-4) or VEGLS (B39-1) - Body ground 10 kΩ or higher EGLS (B53-23) or EGLS (B39-4) - Body ground 10 kΩ or higher EEGLS (B53-36) or EEGLS (B39-5) - Body ground 10 kΩ or higher
NG 
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK 
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REPLACE EGR VALVE
NEXT
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CHECK IF DTC RECURS (P0405 AND/OR P0406)
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Connect the intelligent tester to the DLC3.
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Clear the DTC Click here.
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Turn the ignition switch to the ON position and turn the intelligent tester on.
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Select the following menu items: Powertrain / Engine and ECT / DTC.
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Read the DTCs displayed on the intelligent tester.
Result Display (DTC output) Proceed To No output A P0405 and/or P0406 B
B
REPLACE ECM
A 
END
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