MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Variable Induction Control Solenoid: Testing and Inspection
Variable Tumble Control System (VTCS) Vacuum Switch
VARIABLE TUMBLE CONTROL SYSTEM (VTCS) VACUUM SWITCH INSPECTION
Operation Inspection
1. Disconnect the negative battery cable.
2. Disconnect the vacuum hose from the VTCS vacuum switch.
3. Connect a vacuum pump to the VTCS vacuum switch.
4. Apply vacuum slowly and verify that continuity between the VTCS vacuum switch terminals changes as indicated in the table using an ohmmeter.
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If not as specified, replace the VTCS vacuum switch.
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If VTCS vacuum switch is okay but the PID value is out of specification, perform the "Circuit Open/Short Inspection".
Circuit Open/Short Inspection
Open circuit
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If there is no continuity and the circuit is open, repair or replace the harness.
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Power circuit (VTCS vacuum switch connector terminal A and PCM connector terminal 4J through common connector)
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GND circuit (VTCS vacuum switch connector terminal B and GND through common connector)
Short circuit
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If there is no continuity and the circuit is shorted, repair or replace the harness.
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VTCS vacuum switch connector terminal A and PCM connector terminal 4J through common connector to GND
