MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Knock Sensor: Testing and Inspection
KNOCK SENSOR (KS) INSPECTION
Inspection of Resistance
NOTE: Perform the following test only when directed.
1. Verify that the ignition switch is at LOCK.
2. Disconnect KS connector.
3. Measure the resistance between KS terminal A and the KS body using an ohmmeter.
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If not as specified, replace the KS.
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If knock sensor is okay, but PID value is out of specification, perform the "Circuit Open/Short Inspection". (See KNOCK SENSOR (KS)
REMOVAL/INSTALLATION.)
Specification:
Approx. 560 kiloohms [20 °C {68 °F}]
4. Reconnect the KS connector.
Circuit Open/Short Inspection
Open circuit
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If there is no continuity, the circuit is open. Repair or replace the harness.
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KS circuit (KS connector terminal A and PCM connector terminal 4M through common connector.)
Short circuit
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If there is continuity, the circuit is shorted. Repair or replace the harness.
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KS connector terminal A and PCM connector terminal 4M through common connector to GND.
