Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2003 Mazda MPV ESFACTORY OEM SERVICE PROCEDURE

Knock Sensor

KNOCK SENSOR (KS) RESISTANCE

Temperature °F (°C)

Ohms

B2300, B3000 & B4000 ⁽¹⁾

68 (20)

4390-5350

Mazda6 & MPV

68 (20)

4870

Miata ⁽²⁾

68 (20)

560K

Protege

68 (20)

532-588K

Tribute ⁽³⁾

68 (20)

4390-5350

⁽¹⁾	Measure the resistance between PCM test pin 32 and PCM test pin 57 on break-out box. See Fig 1 .

⁽²⁾	Measure resistance between terminal "A" and KS body. See Fig 3 .

⁽³⁾	Measure the resistance between PCM test pin 87 (2.0L) or PCM test pin 32 (3.0L) and PCM test pin 57. See Fig 6 and Fig 7 .

Fig 1: Identifying KS Terminals (B2300, B3000 & B4000)

Courtesy of MAZDA MOTORS CORP.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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