MX-5 Miata L4-2.0L (2008)
Variable Valve Timing Solenoid: Testing and Inspection
OIL CONTROL VALVE (OCV) INSPECTION [LF]
Coil Resistance Inspection
1. Remove the battery cover.
2. Disconnect the negative battery cable.
3. Disconnect the oil control valve connector.
4. Measure the resistance between terminals A and B using an ohmmeter. If not as specified, replace the oil control valve.
Oil control valve resistance: 6.9 - 7.9 ohms [20°C (68°F)]
5. Connect the oil control valve connector.
Spool Valve Operation Inspection
1. Remove the battery cover.
2. Disconnect the negative battery cable.
3. Remove the oil control valve.
4. Verify that the spool valve in the oil control valve is in the maximum valve timing retard position as indicated in the figure. If not as specified,
replace the oil control valve.
5. Verify that the battery is fully charged. If not as specified, recharge the battery.
6. Apply battery positive voltage between the oil control valve terminals and verify that the spool valve operates and moves to the maximum valve
timing advance position. If not as specified, replace the oil control valve.
Note: When applying battery positive voltage between the oil control valve terminals, the connection can be either of the following:
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Positive battery cable to terminal A, negative battery cable to terminal B
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Positive battery cable to terminal B, negative battery cable to terminal A
7. Stop applying battery positive voltage and verify that the spool valve returns to the maximum valve timing retard position.
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If not as specified, replace the oil control valve.