MX-5 Miata L4-2.0L (2008)
1. Disconnect the PCM connector.
2. Inspect the following harness for an open or short wiring. (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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Variable tumble shutter valve switch terminal A and PCM terminal 2AE
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Variable tumble shutter valve switch terminal B and body ground
Short circuit
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If there is continuity, there is a short circuit. Repair or replace the wiring harness.
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Variable tumble shutter valve switch terminal A and body ground
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Variable tumble shutter valve switch terminal B and power supply