DTC 21: VTEC System Malfunction
Special Tools Required
- Oil pressure gauge attachment 07NAJ-P070100
- Low pressure gauge 07406-0070001
- Hose oil pressure 07ZAJ-S5A0200
- Reset the ECM/PCM (see page 11-468).
- Check the engine oil level, and refill if necessary.
- Start the engine. Hold the engine at 3.000 rpm with no load (in Park or neutral) until the radiator fan comes on.
- Road test the vehicle:
Accelerate in M/T, A/T: 2nd gear to an engine speed over 4,000 rpm (min-1). Hold that engine speed for at least 2 seconds. If DTC 21 is not repeated during the first road test, repeat this test 2 more times.
Is the MIL on and does it indicated DTC 21?
YES |
- Go to step 5. |
NO |
- Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the VTEC solenoid valve and at the ECM/PCM. |
- Turn the ignition switch OFF.
- Remove the resonator (see page 11-448).
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- Turn the ignition switch OFF.
- Disconnect the VTEC solenoid valve 1P connector.
- Check for resistance between the VTEC solenoid valve 1P connector terminal No. 1 and body ground.
VTEC SOLENOID VALVE CONNECTOR
Terminal side of male terminals
Is there 14-30 ohms?
YES |
- Go to step 10. |
NO |
- Replace the VTEC solenoid valve. |
- Disconnect ECM/PCM connector B (24P).
- Check for continuity between ECM/PCM connector terminal B15 and body ground.
ECM/PCM CONNECTOR B (24P)
Wire side of female terminals
Is there continuity?
YES |
- Repair short in the wire between the VTEC solenoid valve and the ECM/PCM (B15). |
NO |
- Go to step 12. |
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