Auto Repair Manual Free Download and ReviewsFree download ebook pdf files automotive manual

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Hard Failures Hard failures cause malfunction indicator light (CHECK ENGINE) to illuminate and remain on until problem is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic (code) charts. If a sensor fails, control unit will use a substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, the vehicle runs but driveability will not be optimum. Intermittent Failures Intermittent failures may cause CHECK ENGINE light to flicker or illuminate and go out after the intermittent fault goes away. However, the corresponding trouble code will be retained in ECU memory. If related fault does not reoccur within a certain time frame, related trouble code will be erased from ECU memory. Intermittent failures may be caused by a sensor, connector or wiring related problems. See INTERMITTENTS in H – TESTS W/O CODES article. RETRIEVING CODES Accessing Trouble Codes

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TESTING DIAGNOSTIC PROCEDURE 1) Before testing transmission, ensure fluid level is correct, shift linkage, throttle cable, neutral switch and idle speed are correctly adjusted. Ensure transfer case linkage and transfer switch (if equipped) are correctly adjusted. Battery must be fully charged for accurate testing. 2) To aid in fault diagnosis, determine if fault is hydraulic, electronic or a combination of both. 3) The electronic control is capable of storing self- diagnostic codes. To determine if a fault is electrical, read any stored diagnostic codes. Repair electrical fault associated with the code. See DIAGNOSTIC CODES. NOTE: Not all electrical faults will cause a diagnostic code to be stored (i.e. throttle position sensor and brake signal). Farther circuit tests may be required See ELECTRICAL COMPONENTS & CIRCUIT.