P0326

CIRCUIT DESCRIPTION

This DTC will set if the knock system is otherwise functioning normally but is detecting excessive knock. This may be due to a noisy engine producing excessive mechanical vibrations from piston slap, valve closures etc. Excessive knock could also be produced by very low octane fuel (85 octane or less).

CONDITIONS FOR SETTING THE DTC

Test Conditions

^ DTC(s) P0325 and P0327 not set.
^ Ignition voltage at least 10 volts.
^ Knock Learn is enabled.
^ Octane learn\lock-in not complete.

Failure Condition

The 87 octane Decay Multiplier is 0.996 or more for 64 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ No message will be displayed.

CONDITIONS FOR CLEARING THE DTC

^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
^ PCM battery voltage is interrupted.
^ Using a Scan tool.