DTC P0406

DTC P0406  : EGR Valve Position Sensor Circuit High Voltage

DTC (PGM-FI)

1. 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)	More than 4.88	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.

2. Determine possible failure area (EGR valve position sensor, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   EGR 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 5P connector: disconnected
   Test circuit	VCC1, SG1
   Test point 1	EGR valve 5P connector No. 2 (PNK)
   Test point 2	EGR valve 5P connector No. 3 (BLU)

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5.0 V?

   YES 

   Replace the EGR valve , then do the repair verification.

   NO 

   Go to step 3.

3. Open wire check (SG1 line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS.

   -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 5P connector: disconnected
   	PCM connector C (51P): disconnected
   Test circuit	SG1
   Test point 1	EGR valve 5P connector No. 3 (BLU)
   Test point 2	PCM connector C (51P) No. 33 (BLU)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The SG1 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then do the repair verification.

   NO 

   Repair an open in the SG1 wire between the PCM (C33) and the EGR valve, then do the repair verification.

4. Repair verification

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Reconnect all connectors.

   -3. Exit the SCS mode with the HDS.

   -4. Turn the vehicle to the ON mode.

   -5. Reset the PCM with the HDS .

   Reset PCM

   -6. Do the PCM idle learn procedure .

   -7. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0406 EGR Valve Position Sensor Circuit High Voltage

   DTC (PGM-FI)

   Is DTC P0406 indicated?

   YES 

   Check for poor connections or loose terminals at the EGR valve and the PCM. If the PCM was updated, substitute a known-good PCM , then recheck. If the PCM was substituted, go to step 1.

   NO 

   Troubleshooting is complete. If the PCM was substituted, replace the original PCM . If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.