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If the transmission is overfilled, the gears churn the CAUSES OF BURNT FLUID Burnt, discolored fluid is a result of overheating which has two primary causes. (1) A result of restricted fluid flow through the main and/or auxiliary cooler. This condition is usu- drainback valve, a damaged main cooler, or severe (2) Heavy duty operation with a vehicle not prop- erly equipped for this type of operation. Trailer tow- fluid if the vehicle is improperly equipped. Such vehicles should have an auxiliary FLUID CONTAMINATION Transmission fluid contamination is generally a result of: • adding incorrect fluid Preliminary Diagnosis Check Procedure 21 - 240 AW–4 AUTOMATIC TRANSMISSION XJ DIAGNOSIS AND TESTING (Continued) |