DTC P2651
DTC P2651 : Rocker Arm Oil Pressure Switch B (Bank 1) Performance/Stuck off
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
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information .
- If DTC P2653 and/or P2654 are stored at the same time as DTC P2651, troubleshoot those DTCs first, then recheck for DTC P2651.
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| P2651 Rocker Arm Oil Pressure Switch B (Bank 1) Performance/Stuck off |
DTC (PGM-FI)
- Oil level check
-1. Check the engine oil level .
Is the level OK?
YES
Go to step 2.
NO
Adjust the engine oil to the proper level , then do the repair verification.
- Problem verification
-1. Turn the vehicle to the ON mode.
-2. Clear the DTC with the HDS.
-3. Select the VTEC+VCM TEST in the INSPECTION MENU with the HDS, then select the CDVEB TEST with the HDS.
CDVEB TEST
Does the HDS indicate Normal?
YES
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at rocker arm oil pressure switch B (Bank 1) and the PCM.
NO
Go to step 3.
- Open wire check (VCMSW line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
Rocker arm oil pressure switch B (Bank 1) 1P connector -3. Turn the vehicle to the ON mode.
-4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Rocker arm oil pressure switch B (Bank 1) 1P connector: disconnected Test circuit VCMSW Test point 1 Rocker arm oil pressure switch B (Bank 1) 1P connector No. 1 (TAN) Test point 2 Body ground Is there any voltage?
YES
The VCMSW wire is OK. Go to step 4.
NO
Go to step 5.
- VCM system oil pressure check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Remove rocker arm oil pressure switch B (Bank 1) (A), and attach the special tools as shown, then attach rocker arm oil pressure switch B (Bank 1) to the oil pressure gauge adapter (B).
-3. Reconnect the following connector.
Rocker arm oil pressure switch B (Bank 1) 1P connector -4. Start the engine.
-5. Select the VTEC+VCM TEST in the INSPECTION MENU with the HDS, then select the CDVEB TEST with the HDS.
CDVEB TEST
Check the oil pressure.
Is the oil pressure 45 kPa (0.46 kgf/cm2, 6.5 psi) or more?
YES
Inspect the VCM system oil passage. If it is OK, replace the rear rocker arm oil control valve , then do the repair verification.
NO
Replace the rear rocker arm oil control valve , then do the repair verification.
- Rocker arm oil pressure switch B (Bank 1) internal circuit check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. At the rocker arm oil pressure switch side, check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rocker arm oil pressure switch B (Bank 1) 1P connector: disconnected Test circuit VCMSW Test point 1 Rocker arm oil pressure switch B (Bank 1) 1P connector No. 1 (rocker arm oil pressure switch side) Test point 2 Body ground Is there continuity?
YES
Replace rocker arm oil pressure switch B (Bank 1) , then do the repair verification.
NO
Repair an open in the VCMSW wire between the PCM (C34) and rocker arm oil pressure switch B (Bank 1), then do the repair verification.
- Repair verification
-1. Reconnect all connectors.
-2. Turn the vehicle to the ON mode.
-3. Reset the PCM with the HDS .
Reset PCM
-4. Do the PCM idle learn procedure .
-5. Select the VTEC+VCM TEST in the INSPECTION MENU with the HDS, then select the CDVEB TEST with the HDS.
CDVEB TEST
Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P2651 Rocker Arm Oil Pressure Switch B (Bank 1) Performance/Stuck off DTC (PGM-FI)
Is DTC P2651 indicated?
YES
Check for poor connections or loose terminals at rocker arm oil pressure switch B (Bank 1) 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.