P0327

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) uses a Knock Sensor (KS) to detect engine detonation (spark knock). The knock sensor produces an AC signal at all engine speeds, and loads. The PCM makes adjustments to the spark timing based on the amplitude and frequency of the KS signal.

The PCM uses the KS signal to learn the average level of engine noise (noise channel). The PCM checks the KS system by comparing the actual KS signal to the noise channel. A normal KS signal should switch outside a voltage range above and below the noise channel. If the PCM detects a KS signal below a calibrated value, DTC P0327 will set.

CONDITIONS FOR RUNNING THE DTC
^ Engine speed is more than 3000 RPM.
^ ECT is more than 40°C (104°F).
^ System voltage is between 11-18 volts.
^ Throttle angle is more than 5 percent.

CONDITIONS FOR SETTING THE DTC
The PCM detects a KS signal less than 0.5 volt.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store the conditions present when the DTC set as Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
If the conditions is intermittent, refer to Intermittent Conditions in Symptoms. Intermittent Conditions