( TF09EABK72100092648FAAT00 )
DTC Troubleshooting: P2648 (21)
DTC P2648:
 Rocker Arm Oil Control Solenoid Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Select the VTEC TEST in the INSPECTION MENU with in the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2648 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the rocker arm oil control solenoid 2P connector.
  1. Measure the resistance between the rocker arm oil control solenoid 2P connector terminals No. 1 and No. 2.
Is there 14−30 Ω at room temperature?
YES -
Go to Step 8 .
NO -
Go to Step 11 .
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (49P).
  1. Check for continuity between ECM/PCM connector terminal B35 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM (B35) and the rocker arm oil control solenoid, then go to Step 12 .
NO -
Go to Step 19 .
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Do the VTEC TEST in the INSPECTION MENU with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2648 indicated?
YES -
Check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM, then go to Step 1 .
NO -
Go to Step 18 .
  1. Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in Step 17 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 16 .
  1. Reconnect all connectors.
  1. Do the VTEC TEST in the INSPECTION MENU with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2648 indicated?
YES -
Check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to Step 21 . If the ECM/PCM was substituted, go to Step 1 .
NO -
Go to Step 23 .
  1. Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs were indicated in Step 22 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to Step 21 . If the ECM/PCM was substituted, go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 21 .