DTC Troubleshooting: P0405
DTC P0405: EGR Valve Position Sensor Circuit Low Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0405 EGR Valve Position Sensor Circuit Low Voltage
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
EGR Valve Position Sensor (EGR Vls)
Less than 0.537
V
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Open wire check (VCC2 line):

Open wire check (VCC2 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
EGR valve 5P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
EGR valve 5P connector: disconnected
Test point 1
EGR valve 5P connector (female terminals) No. 2:
Test point 2
EGR valve 5P connector (female terminals) No. 3:


Is there about 5.0 V?

     
YES
     
     
     
The VCC2 wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open in the VCC2 wire between the PCM (C30) and the EGR valve.?
3.
Shorted wire check (EGRL line):

Shorted wire check (EGRL line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connector.
PCM connector C (51P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EGR valve 5P connector: disconnected
 
PCM connector C (51P): disconnected
Test point 1
EGR valve 5P connector (female terminals) No. 4:
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short in the EGRL wire between the PCM (C40) and the EGR valve.?
     
NO
     
     
     
The EGRL wire is not shorted. Go to step 4.
4.
Open wire check (EGRL line):

Open wire check (EGRL line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EGR valve 5P connector: disconnected
 
PCM connector C (51P): disconnected
Test point 1
EGR valve 5P connector (female terminals) No. 4:
Test point 2
PCM connector C (51P) No. 40


Is there continuity?

     
YES
     
     
     
The EGRL wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the EGRL wire between the PCM (C40) and the EGR valve.?
5.
PCM internal circuit check:

PCM internal circuit check
?1.
Connect terminals A and B with a jumper wire.
Terminal A
EGR valve 5P connector (female terminals) No. 2:
Terminal B
EGR valve 5P connector (female terminals) No. 4:


?2.
Reconnect PCM connector C (51P).

?3.
Exit the SCS mode with the HDS.


?4.
Turn the vehicle to the ON mode.

?5.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
EGR Valve Position Sensor (EGR Vls)
Less than 0.537
V
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0405 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
The PCM internal circuit is OK. Replace the EGR valve.?