Dtc P2649: Vtec Solenoid Valve Circuit High Voltage - Acura TSX 2004 Manual

are indicated, go to the indicated DTC troubleshooting.
NO: Go to step 17.
17. Monitor the OBD STATUS for DTC P2648 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 15 and recheck.
18. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see
ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ).
19. Do the VTEC TEST in the INSPECTION MENU with the HDS.
20. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES: If DTC P2648 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 troubleshooting.
NO: If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was
substituted, replace the original ECM/PCM (see HOW TO REMOVE THE ECM/PCM
FOR TESTING ).

DTC P2649: VTEC SOLENOID VALVE CIRCUIT HIGH VOLTAGE

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 RPM with no load (in Park or neutral) until the radiator
fan comes on, then let it idle.
4. Check for Temporary DTCs or 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.
5. Turn the ignition switch OFF.
6. Disconnect the VTEC solenoid valve 2P connector.
7. Measure resistance between VTEC solenoid valve 2P connector terminals No. 1 and No. 2.
Is there 14-30 ohm?
YES: Go to step 8.
NO: Go to step 13 .
Wednesday, March 12, 2008 2:17:58 AM
2004 Acura TSX
2004 ENGINE PERFORMANCE VTEC/VTC - TSX
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