P0326
DTC P0326
Circuit Description
The Knock Sensor (KS) System enables the powertrain control module (PCM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The knock sensor is located on the intake side of the engine block. The sensor produces an AC voltage signal that varies at all engine speeds and loads. The PCM adjusts the spark timing based on the amplitude and the frequency of the KS signal. The PCM receives the KS signal through 2 isolated signal circuits. If the PCM is operating on large amounts of spark retard and is unable to eliminate the knock, this DTC will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0326 Knock Sensor (KS) Performance
Conditions for Running the DTC
* The engine speed is more than 1,800 RPM.
* The manifold absolute pressure (MAP) is more than 55 kPa.
* DTC P0326 runs continuously when the above conditions are met.
Conditions for Setting the DTC
* The KS signal indicates an engine knock is present.
* The PCM commanded spark retard at a given engine load and speed is more than the calibrated value for 8 seconds.
Action Taken When the DTC Sets
* The control module stores the DTC information into memory when the diagnostic runs and fails.
* The malfunction indicator lamp (MIL) will not illuminate.
* The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
* The driver information center, if equipped, may display a message.
Conditions for Clearing the DTC
* A current DTC Last Test Failed clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
* Clear the DTC with a scan tool.
Test
