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 noise. When the knock sensor cannot eliminate noise by retarding spark timing, DTC P0326 will be set.

DTC PARAMETERS DTC P0326 will set if:

^ If the PCM cannot reduce engine noise by retarding timing (e.g. the engine noise probably not due to spark knock).

NOTE: 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) we set table values to 0.

^ Below 56°C (133°F) we set table values to 75% of stored earned values.

^ Above 104°C (219°F) we use the stored values.

^ Temperatures in between are adjusted on a percentage value.