DTC Troubleshooting: P2649 (21)

DTC P2649: VTEC Solenoid Valve Circuit High Voltage Turn the ignition switch ON (II). Clear the DTC with the HDS. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (in Park or neutral) until the radiator fan comes on, then let it idle. Check for DTCs in the DTCs MENU with the HDS. Is DTC P2649 indicated?
YES | - | Go to Step 5 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the VTEC solenoid valve and the ECM/PCM.■
Turn the ignition switch OFF. Disconnect the VTEC solenoid valve 2P connector. Measure resistance between VTEC solenoid valve 2P connector terminals No. 1 and No. 2. Is there 14−30 Ω?
YES | - | Go to Step 8 .
NO | - | Go to Step 13 .

Check for continuity between VTEC solenoid valve 2P connector terminal No. 2 and body ground. Is there continuity?
YES | - | Go to Step 9 .
NO | - | Repair open in the wire between the VTEC solenoid valve and G101, then go to Step 14 .
Jump the SCS line with the HDS. Disconnect ECM/PCM connector B (24P). |

Connect VTEC solenoid valve 2P connector terminal No. 1 to body ground with a jumper wire. |

Check for continuity between ECM/PCM connector terminal B6 and body ground. Is there continuity?
YES | - | Go to Step 21 .
NO | - | Repair open in the wire between the ECM/PCM (B6) and the VTEC solenoid valve, then go to Step 14 .
Replace the VTEC solenoid valve. Reconnect all connectors. Turn the ignition switch ON (II). Reset the ECM/PCM with the HDS. Do the ECM/PCM idle learn procedure. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (in Park or neutral) until the radiator fan comes on, then let it idle. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P2649 is indicated, check for poor connections or loose terminals at the VTEC solenoid valve 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 20 .
Monitor the OBD STATUS for DTC P2649 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 18 . and recheck.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (in Park or neutral) until the radiator fan comes on, then let it idle. 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 solenoid valve 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. ■