DTC P2646

DTC P2646  : Rocker Arm Oil Pressure 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 

NOTE: 

• How to read the torque specifications .
• Before you troubleshoot, review the general troubleshooting information .
• If DTC P055C, P2648, and/or P2649 are stored at the same time as DTC P2646, troubleshoot those DTCs first, then recheck for DTC P2646.

DTC (PGM-FI)

1. 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 .

2. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Enter the maintenance mode, then start the engine .

   -4. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   -5. Select the VTEC TEST in the Function Test Menu with the HDS.

   VTEC TEST

   Is the result OK?

   YES 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil pressure sensor 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 .

   NO 

   The failure is duplicated. Go to step 3.

3. DTC check

   -1. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P055C Rocker Arm Oil Pressure Sensor Low Voltage
   P2648 Rocker Arm Oil Control Solenoid Circuit Low Voltage

   Is DTC P055C and/or P2648 indicated?

   YES 

   Go to the indicated DTC's troubleshooting.

   NO 

   Go to step 4.

4. VTEC system oil pressure check

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

   -2. Remove the rocker arm oil pressure sensor (A), and attach the special tools as shown, then attach the rocker arm oil pressure sensor to the oil pressure gauge adapter (B).

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

   -3. Reconnect the following connector.

   Rocker arm oil pressure sensor 3P connector

   -4. Enter the maintenance mode, then start the engine .

   -5. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   -6. Select the VTEC TEST in the Function Test Menu with the HDS.

   VTEC TEST

   Check the oil pressure while the status of VTEC solenoid valve on the HDS display is ON.

   Is the oil pressure 49 kPa (0.50 kgf/cm 2, 7.1 psi) or more?

   YES 

   Replace the rocker arm oil pressure sensor .

   NO 

   Inspect the VTEC system oil passage. If it is OK, replace the rocker arm oil control valve .