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.

2006 Mazda MPV ESFACTORY OEM SERVICE PROCEDURE

DTC P0328: Notes

DTC P0328 [AJ] DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0328

Knock sensor circuit high input

DETECTION CONDITION

PCM monitors input signal from knock sensor when engine is running. If input voltage at PCM terminal between 81 and 3 is above 3.75 V , PCM determines that knock sensor circuit is malfunctioning.

Diagnostic support note

This is a continuous monitor (CCM).
The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
PENDING CODE is available if the PCM detects the above malfunction condition.
FREEZE FRAME DATA is available.
DTC is stored in PCM memory.

POSSIBLE CAUSE

Knock sensor malfunction
Connector or terminal malfunction
Short to power circuit in wiring between knock sensor terminal A and PCM terminal 81
Short to power circuit in wiring between knock sensor terminal B and PCM terminal 3
PCM malfunction

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.