DTC P3400: VPS Stuck Off Bank 1

Special Tools Required 

• Pressure Gauge Adapter 07NAJ-P07010A
• A/T Low Pressure Gauge w/Panel 07406-0070301
• A/T Pressure Test Hose 07AAJ-PY4A100
• A/T Pressure Adapter 07MAJ-PY40120
• Oil Pressure Hose 07ZAJ-S5AA200

1. Check the engine oil level and quality.

   Is it OK? 

   YES  -Go to step 2.

   NO  -Adjust the engine oil level to the proper level, or replace the engine oil if needed, then go to step  31.

2. Turn the ignition switch to ON (II).
3. Clear the DTC with the HDS.
4. Select the VTEC TEST in the INSPECTION MENU with the HDS, and do the VPS TEST.

   Are VCMB1-0 and VCMB2-0 indicated? 

   YES  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at rocker arm oil control solenoid A (Bank 1), rocker arm oil control solenoid B (Bank 1), the rear rocker arm oil pressure switch, and the PCM.

   NO  -If the result is

   • VCMB1-1: Go to step 5.
   • VCMB1-3: Go to step  13.
   • VCMB1-2, VCMB1-4: Check the oil passage of the rear bank cylinder pause system. If it is OK, replace the rear rocker arm oil control valve (see REAR ROCKER ARM OIL CONTROL VALVE REPLACEMENT ), then go to step  30.
   • VCMB2-1, 2-2, 2-3, 2-4: The front bank cylinder pause system is faulty. Go to the troubleshooting for DTC P3497 (see DTC P3497: VPS STUCK OFF BANK 2  ).
5. Turn the ignition switch to LOCK (0).
6. Disconnect the rear rocker arm oil pressure switch 1P connector.
7. Turn the ignition switch to ON (II).
8. Check ROCKER ARM OIL PRESSURE SWITCH B in the DATA LIST with the HDS.

   Is SWITCH ON indicated? 

   YES  -Go to step 9.

   NO  -Replace the rear rocker arm oil pressure switch (see REAR ROCKER ARM OIL PRESSURE SWITCH REMOVAL/INSTALLATION  ), then go to step  30.

9. Turn the ignition switch to LOCK (0).
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector C (49P).
12. Check for continuity between PCM connector terminal C30 and body ground.
    Fig 1: Checking Continuity Between PCM Connector Terminal C30 And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the PCM (C30) and the rear rocker arm oil pressure switch, then go to step  30.

    NO  -Check for poor connections or loose terminals at rocker arm oil control solenoid A (Bank 1), rocker arm oil control solenoid B (Bank 1), the rear rocker arm oil pressure switch, and the PCM, then go to step  36.

13. Select the VTEC TEST in the INSPECTION MENU with the HDS, and do the VPS TEST.
14. Check the ROCKER ARM OIL PRESSURE SENSOR with the HDS during the 3 CYLINDER ACTIVATION (TEST 3 and 6) and the 4 CYLINDER ACTIVATION (TEST 5 and 7).

    Is there about 217.0 kPa (2.2 kgf/cm ²  , 31.5 psi) or more? 

    YES  -Go to step 15.

    NO  -Check these parts:

    • Engine oil filter
    • Engine oil screen
    • Engine oil pump
    • Engine oil passage

    If needed, clean or replace these parts, then go to step  31.

15. Turn the ignition switch to LOCK (0).
16. Disconnect the rear rocker arm oil pressure switch 1P connector.
17. Connect the rear rocker arm oil pressure switch 1P connector terminal to body ground with a jumper wire.
    Fig 2: Connecting Rear Rocker Arm Oil Pressure Switch 1P Connector Terminal To Body Ground Using Jumper Wire

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
18. Turn the ignition switch to ON (II).
19. Check ROCKER ARM OIL PRESSURE SWITCH B in the DATA LIST with the HDS.

    Is SWITCH ON indicated? 

    YES  -Go to step 20.

    NO  -Go to step  26.

20. Turn the ignition switch to LOCK (0).
21. Remove the rear rocker arm oil pressure switch (see REAR ROCKER ARM OIL PRESSURE SWITCH REMOVAL/INSTALLATION  ).
22. Attach the special tools to the rear rocker arm oil control valve as shown, then attach the rear rocker arm oil pressure switch (A) to the pressure gauge adapter (B).
    Fig 3: Attaching Special Tools To Rear Rocker Arm Oil Control Valve With Torque Specifications

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
23. Reconnect the rear rocker arm oil pressure switch 1P connector.
24. Select the VTEC TEST in the INSPECTION MENU with the HDS, and do the VPS TEST.
25. Check the oil pressure during the 3 CYLINDER ACTIVATION (TEST 3 and 6) and the 4 CYLINDER ACTIVATION (TEST 5 and 7).

    Does the oil pressure increase to at least 56.4 kPa (0.58 kgf/cm ²  , 8.2 psi)? 

    YES  -Replace the rear rocker arm oil pressure switch (see REAR ROCKER ARM OIL PRESSURE SWITCH REMOVAL/INSTALLATION  ), then go to step  30.

    NO  -Check the rear cylinder pause system oil passage. If it is OK, replace the rear rocker arm oil control valve (see REAR ROCKER ARM OIL CONTROL VALVE REPLACEMENT ), then go to step  30.

26. Turn the ignition switch to LOCK (0).
27. Jump the SCS line with the HDS.
28. Disconnect PCM connector C (49P).
29. Check for continuity between PCM connector terminal C30 and body ground.
    NOTE: Do not remove the jumper wire from the rear rocker arm oil pressure switch.
    Fig 4: Checking Continuity Between PCM Connector Terminal C30 And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Check for poor connections or loose terminals at rocker arm oil control solenoid A (Bank 1), rocker arm oil control solenoid B (Bank 1), the rear rocker arm oil pressure switch, and the PCM. If the connections and terminals are OK, go to step  36.

    NO  -Repair an open in the wire between the rear rocker arm oil pressure switch and the PCM (C30), then go to step 30.

30. Reconnect all connectors.
31. Turn the ignition switch to ON (II).
32. Reset the PCM with the HDS.
33. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
34. Select the VTEC TEST in the INSPECTION MENU with the HDS, and do the VPS TEST.

    Are VCMB1-0 and VCMB2-0 indicated? 

    YES  -Go to step 35.

    NO  -Check for poor connections or loose terminals at rocker arm oil control solenoid A (Bank 1), rocker arm oil control solenoid B (Bank 1), the rear rocker arm oil pressure switch, and the PCM, then go to step  1.

35. Check for Pending or Confirmed DTCs with the HDS.

    Are any Pending or Confirmed DTCs indicated? 

    YES  -Go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -Troubleshooting is complete.

36. Reconnect all connectors.
37. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
38. Select the VTEC TEST in the INSPECTION MENU with the HDS, and do the VPS TEST.

    Are VCMB1-0 and VCMB2-0 indicated? 

    YES  -Go to step 39.

    NO  -If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step  1.

39. Check for Pending or Confirmed DTCs with the HDS.

    Are any Pending or Confirmed DTCs indicated? 

    YES  -Go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ).