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Exceptions are Code 13, 15, 24, 44 and 45 charts, which may be used to help diagnose intermittent codes. For diagnosing intermittent codes, proceed to INTERMITTENTS in TESTS W/O CODES article. For diagnosing hard codes, proceed to appropriate trouble code chart in this article. See HARD OR INTERMITTENT TROUBLE CODE DETERMINATION in this article. Hard codes will cause the SERVICE ENGINE SOON light to illuminate continuously while engine is running. If trouble codes were displayed (other than Code 12), decide whether codes are hard or intermittent trouble codes.DIAGNOSTIC CIRCUIT CHECK must be performed prior to utilizing trouble code charts. DO NOT proceed with testing unless all other problems have been repaired. Make sure all engine systems not related to the computer system are operating properly.See INTERMITTENTS in TESTS W/O CODES article in this section.Ĭhevrolet Lumina Euro 1991 - DIAGNOSTIC PROCEDUREĭiagnosis of the computerized engine control system should be performed in the following order: Intermittent failures may be caused by sensor, connector or wiring related problems. If related fault does not reoccur within 50 engine restarts, related trouble code will be erased from control module memory. The corresponding trouble code, however, will be retained in control module memory. Intermittent failures cause SERVICE ENGINE SOON light to flicker or illuminate and go out about 10 seconds after the intermittent fault goes away. In this condition, vehicle is functional, but most likely degraded driveability will be encountered.Ĭhevrolet Lumina Euro 1991 - INTERMITTENT FAILURES If a sensor fails, control module will use a substitute value in its calculations to continue engine operation. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic (code) charts. Hard failures cause SERVICE ENGINE SOON light to illuminate and remain on until the malfunction is repaired. Malfunctions are recorded as HARD FAILURES or as INTERMITTENT FAILURES.Ĭhevrolet Lumina Euro 1991 - HARD FAILURES To retrieve stored codes, see RETRIEVING CODES (NON-SCAN) in this article. When malfunction is detected and light is turned on, a corresponding trouble code will be stored in control module memory. When a malfunction occurs, control module will illuminate the SERVICE ENGINE SOON light located on instrument panel. Control module is equipped with a self-diagnostic system, which detects system failures or abnormalities. Unless specifically stated, references to ECM also apply to PCM equipped vehicles.
If only intermittent codes are present, see INTERMITTENTS in TESTS W/O CODES article in this section.Ĭhevrolet Lumina Euro 1991 - SELF-DIAGNOSTIC SYSTEMĪll vehicle are equipped with either an Electronic Control Module (ECM) or Powertrain Control Module (PCM). If no fault codes or only a non-running Code 12 is present and driveability problems exist, proceed to TESTS W/O CODES article in this section for diagnosis by symptom (i.e. If no faults were found while performing BASIC TESTING PROCEDURES, proceed with DIAGNOSTIC PROCEDURE. Failure to do so may result in lost diagnostic time. Before considering the computer system as a possible cause of problems, perform checks and inspections covered in BASIC TESTING article. Most engine control problems are the result of mechanical breakdowns, poor electrical connections or damaged vacuum hoses. Chevrolet Lumina Euro 1991 - G - TESTS W/CODES - 2.5L 1991 ENGINE PERFORMANCE General Motors 2.5L "W" Body Self-Diagnostics TBI Tests With CodesĬhevrolet Lumina Euro 1991 - INTRODUCTION
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