DTCs are indicated, go to the indicated DTC troubleshooting.
NO: Go to step 18.
18. 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, then go to step 1 and recheck. If the screen indicates
NOT COMPLETED, go to step 16 and recheck.
19. 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 ).
20. 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 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 P2648: VTEC SOLENOID VALVE CIRCUIT LOW VOLTAGE
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. 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 solenoid valve and the ECM/PCM.
NO: Go to step 4.
4. Turn the ignition switch OFF.
5. Disconnect the VTEC solenoid valve 2P connector.
6. Measure resistance between VTEC solenoid valve 2P connector terminals No. 1 and No. 2.
Is there 14-30 ohm?
YES: Go to step 7.
NO: Go to step 10 .
2004 Acura TSX
2004 ENGINE PERFORMANCE VTEC/VTC - TSX
Wednesday, March 12, 2008 2:17:58 AM Page 28
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