Part of Content :
Contain information about useful service tips for Automotive Technician. Unlike the earlier models that did not have the light,
these models give a visual indication of when the ECM detects a problem. In addition to alerting the vehicle operator, the “Check Engine” light can be used to retrieve EEC IV fault codes. These tests should be performed on an engine that is at operating temperature, otherwise, false fault codes may be set. Also, make sure that all switches, including the air conditioner and defroster, are in the off position. These codes may also cause the “Check Engine” light to illuminate during engine operation. The first set of codes to appear are the “On Demand” codes. These may be two or three digit codes, depending on the model year. After this sequence, any fault codes will be transmitted through the “Check Engine” light in the same manner as the KOEO test. Fault codes that appear indicate a problem that the ECM detected during that particular test. Fault codes as a result of this test do not need to be erased. This is the tip off that the sensor is the cause of the lean stumble. For example, with a 3300 engine, when the throttle is snapped, you usually see a default value of about 80 grams/ second.
Tags : ford eec, vehicle operator, visual indication, ecm, air conditioner, switches, ford, models, check engine light
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