It is also possible that certain driveability concerns have been rectified by the manufacturer through substitution of a revised calibration chip or computer control unit. These problems may cause a noticeable driveability problem or cause the MALFUNCTION warning light to illuminate on some vehicles. Use intermittent test procedures to locate intermittent driveability problems that do not occur when the vehicle is being tested. A symptom should lead to further testing of specific components or systems, or verification of adjustment specifications. Symptom checks are intended to direct the technician to malfunctioning component(s) so that further diagnosis may be performed. Use this article to diagnose driveability problems that exist when a hard fault code is not present or vehicle is not equipped with a self-diagnostic system. Jeep Grand Wagoneer 1990 - H - TESTS W/O CODES 1990 ENGINE PERFORMANCE Trouble Shooting - No Codesīefore attempting to diagnose symptoms or intermittent faults, ensure steps in BASIC TESTING and TESTS W/CODES (if applicable) articles have been performed.
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