P0326

Wiring Diagram:

The purpose of this code is to indicate excessive engine noise, The knock sensor cannot differentiate between spark knock and other similar engine noises. When the knock sensor cannot eliminate noise by retarding spark timing, DTC P0326 will be set.

DTC PARAMETERS
DTC P0326 will set if the PCM cannot reduce engine noise by retarding timing (e.g., the engine noises probably not due to spark knock).

IMPORTANT: The knock circuit is continuously monitored for these parameters.

DIAGNOSTIC AIDS
DTC P0326 indicates excessive engine noise usually caused by something else besides spark knock.

It does not indicate a faulty knock sensor circuit subsystem.

POSSIBLE CAUSES:
^ Valve lifter noise
^ Belt tensioner
^ Loose bracket
^ Low octane fuel in high ambients while pulling loads
^ Piston/cylinder bore scuffed

The PCM has the ability to learn spark retard. If knock is present long enough to fill the mid, hi and low spark compensating cells a reduced power condition may result due to maximum spark retard. The spark compensating cells will eventually learn back (0) when knock condition is corrected.

The spark compensating cells (hi, mid and low spark comp) may be viewed on the Scan tool's spark table.

The stored spark retard (hi, mid, & low table values) are adjusted according to start-up coolant temperature.

If coolant temperature is:
Below 8°C (46°F), table values are set to 0.
Below 56°C (133°F), table values are set to 75% of stored learned values.
Above 104°C (219°F), stored values are used.
Temperatures in between are adjusted on a percentage value.