Question about 1992 Cadillac DeVille
If there is a check engine light, then the codes should be pulled off of it.
OBD-I Systems Fig. 1: Diagnostic trouble codes - 4.5L engine
Fig. 2: Diagnostic trouble codes - 4.9L engine
Fig. 3: Diagnostic trouble codes - 4.6L engine
Listings of the trouble codes for the various engine control systems covered in this manual are located in this section. Remember that a code only points to the faulty circuit NOT necessarily to a faulty component. Loose, damaged or corroded connections may contribute to a fault code on a circuit when the sensor or component is operating properly. Be sure that the components are faulty before replacing them, especially the expensive ones. The Assembly Line Diagnostic Link (ALDL) connector or Data Link Connector (DLC) may be located under the dash and sometimes covered with a plastic cover labeled DIAGNOSTIC CONNECTOR.
Posted on Nov 12, 2010
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Posted on Jan 02, 2017
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