Test Description

NOTE: Test numbers refer to numbers on diagnostic chart.

If Code P0325 is detected, PCM will retard spark timing. If an audible knock is heard from engine, repair internal engine problem. Normally no knock should be detected at idle.
PCM applies 5 volts through a pull-up resistor which should be present at knock sensor terminal.
Determines if knock sensor is faulty or if knock sensor portion of PROM is faulty.

Fig 1: Code P0325 Schematic (3.8L) Knock Sensor Error (Single Sensor)

Fig 2: Code P0325 Diagnostic Flow Chart (3.8L) Knock Sensor Error (Single Sensor)