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 both knock sensor terminals.
Determines if knock sensor is faulty or if knock sensor portion of PROM is faulty.
Check knock sensor circuit for an intermittent open or short to ground. Also check for proper PROM installation.

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

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