MX-5 Miata L4-2.0L (2008)
1. Disconnect the PCM connector.
2. Disconnect the rear H02S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
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If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
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Rear H02S terminal A and PCM terminal 2Q
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Rear H02S terminal B and PCM terminal 2BH
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Rear H02S terminal C and ignition relay
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Rear H02S terminal D and PCM terminal 2BE
Short circuit
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If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
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Rear HO2S terminal A and power supply
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Rear HO2S terminal A and body ground
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Rear H02S terminal B and power supply
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Rear H02S terminal B and body ground
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Rear H02S terminal C and body ground
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Rear H02S terminal D and power supply
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Rear H02S terminal D and body ground