Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 2001 >> MX-5 Miata LS L4-1.8L DOHC >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Knock Sensor >> Testing and Inspection
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Knock Sensor: Testing and 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.
- If not as specified, replace the KS.
- If knock sensor is okay, but PID value is out of specification, perform the "Circuit Open/Short Inspection".

Specification: Approx. 560 kOhms [20 °C {68 °F}]

4. Reconnect the KS connector.

Circuit Open/Short inspection




Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- KS circuit (KS connector terminal A and PCM connector terminal 4M through common connector.)

Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- KS connector terminal A and PCM connector terminal 4M through common connector to GND.
pro multis · About Operation CHARM