P0325

Knock sensor circuit malfunction

Detection Conditions

• If the ECU detects the knock sensor signal to be below 1.25V or above 3.75V after ignition key is turned to ON, the ECU determines that the knock sensor circuit has malfunctioned.

Diagnostic Support Notes

• This is a continuous monitor (CCM)
• Check engine indicator illuminates if the ECU detects the above malfunction condition during the first drive cycle
• PENDING CODE data is not available
• FREEZE FRAME DATA is available
• DTC is stored in ECU memory

Possible Causes

• Knock sensor malfunction
• Connector or terminal malfunction
• Short to ground circuit between knock sensor terminal A and ECU
• Open circuit in wiring between knock sensor terminal A and ECU

[P0325 - From 2002 Mazda Millenia factory service manual]