DTC Troubleshooting: P2647 (22)

DTC P2647: VTEC Oil Pressure Switch Circuit High Voltage

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 go to Step 14 .

1. Turn the ignition switch ON (II).

1. Clear the DTC with the HDS.

1. Do the VTEC TEST in the INSPECTION MENU with the HDS.

Is the result OK?

YES | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the VTEC oil pressure switch and the ECM/PCM.■
NO | - | Go to Step 5 .

1. Check the result of Step 4 .
   - VTEC Switch Failure
   - VTEC Switch Open
   - VTEC Switch SIG Line Open
   - VTEC Switch GND Line Open

Does the test result any of the above?

YES | - | Go to Step 6 .
NO | - | Check for poor connections or loose terminals at the VTEC oil pressure switch. If it is OK, replace the VTEC solenoid valve, then, go to Step 14 .

1. Turn the ignition switch OFF.

1. Disconnect the VTEC oil pressure switch 2P connector.

1. At the VTEC oil pressure switch, check for continuity between VTEC oil pressure switch 2P connector terminals No. 1 and No. 2.

Is there continuity?

YES | - | Go to Step 9 .
NO | - | Replace the VTEC oil pressure switch, then go to Step 13 .

1. Turn the ignition switch ON (II).

1. Measure voltage between VTEC oil pressure switch 2P connector terminal No. 1 and body ground.

Is there battery voltage?

YES | - | Repair open in the wire between the VTEC oil pressure switch and G101, then go to Step 13 .
NO | - | Go to Step 11 .

1. Measure voltage between ECM/PCM connector terminal B11 and body ground.

Is there battery voltage?

YES | - | Repair open in the wire between the ECM/PCM (B11) and the VTEC oil pressure switch, then go to Step 12 .
NO | - | Go to Step 19 .

1. Turn the ignition switch OFF.

1. Reconnect all connectors.

1. Turn the ignition switch ON (II).

1. Reset the ECM/PCM with the HDS.

1. Do the ECM/PCM idle learn procedure.

1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES | - | If DTC P2647 is indicated, check for poor connections or loose terminals at the VTEC oil pressure switch and the ECM/PCM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Go to Step 18 .

1. Monitor the OBD STATUS for DTC P2647 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES | - | Troubleshooting is complete.■
NO | - | If the screen indicates FAILED, go to Step 1 and recheck. If the screen indicates NOT COMPLETED, go to Step 16 , and recheck.

1. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES | - | If DTC P2647 is indicated, check for poor connections or loose terminals at the VTEC oil pressure switch and the ECM/PCM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. ■