P1602

Diagram Chart:

CIRCUIT DESCRIPTION

The ECM employs an internal Integrated Circuit (IC) in order to continuously monitor the knock control evaluation circuit. The Knock Sensor (KS) module IC contains the circuitry that allows the ECM to utilize the KS signals and diagnose the KS sensors and circuitry. The KS Module is not a replaceable component. If the ECM detects a fault in the ability of the IC to sample these signals, this DTC will set.

CONDITIONS FOR RUNNING THE DTC

Tested continuously

CONDITIONS FOR SETTING THE DTC

The ECM detects a fault in the internal knock control IC.

ACTION TAKEN WHEN THE DTC SETS

The ECM illuminates the Malfunction Indicator Lamp (MIL) and records the operating conditions in the Freeze Frame on the second consecutive drive trip that the diagnostic runs and fails.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The ECM turns off the MIL afier three consecutive drive trips that the diagnostic runs and does not fail.

^ A History DTC clears after forty consecutive warm-up cycles if no failures report by this diagnostic or any other emission related diagnostic.

^ The ECM battery voltage is interrupted. The scan tool clears the MIL/DTC.