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Home >> Mazda >> 2003 >> 6 V6-3.0L DOHC >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Knock Sensor >> Testing and Inspection
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Knock Sensor: Testing and Inspection

KNOCK SENSOR (KS) INSPECTION

NOTE: Perform the following inspection only when directed.

Resistance Inspection

1. Disconnect the negative battery cable.
2. Disconnect the KS connector.




3. Measure the resistance between the KS terminals A and B using an ohmmeter.
- If the KS is okay, but the PID value is out of specification, perform the "Circuit Open/Short Inspection".
- If not as specified, replace the KS.

Specification: Approx. 4.87 megohms (20°C {68°F})

Circuit Open/Short Inspection

1. Disconnect the PCM connector.




2. Inspect the following harness for open or short circuit. (Continuity check)

Open circuit

- KS terminal B (harness-side) and PCM terminal 31 (harness-side)
- KS terminal A (harness-side) and PCM terminal 4 (harness-side)

Short circuit

- KS terminal A (harness-side) and power supply
- KS terminal A (harness-side) and body GND
- KS terminal B (harness-side) and power supply
- KS terminal B (harness-side) and body GND
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