When the ECU retards ignition timing because it has detected knock, the Knock CEL setting defines the amount of timing retard that must occur before the ECU illuminates the Check Engine Light as a warning.
The Coolant CEL setting defines the coolant temperature that must be reached before the ECU illuminates the Check Engine Light as a warning.
A non-zero Coolant offset causes the ECU to behave as if the coolant temperature is higher than it really is. This is useful when a colder-than-stock thermostat is installed in the engine since a number of ECU functions are disabled until the ECU sees that the engine is sufficiently warm. In a 2G the ECU also controls the radiator fans, so increasing this setting will cause the fans to come on at a lower coolant temperature.
The stock in-dash boost gauge can be made to display any one of the following items. Bottom, Center and Top list the values at the corresponding needle positions.
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