33 TRANSFER CASE TROUBLE SHOOTING Malfunctions of transfer case due to system elements are diagnosed by ECU and indication is given by flashing of both 4H and 4L indicator lights. Refer self diagnosis to identify the cause detected by ECU. Problem Possible causes Remedy Electric shift problems Faulty or damaged ECU, speed Refer to self diagnosis sensor, clutch or internal wiring Damaged or worm shift cam, Overhaul and check for wear hub, fork and rail shaft and damage. Replace if necessary No front wheel drive Broken drive chain Check internal parts and when shifted to 4H or 4L replace if necessary Noise in 4WD operation Oil level lower than minimum required Drain old oil and replace with specified oil Loosened bolts or mounting parts Re-tighten as specified Noisy Transfer case bearings Disassemble bearings and parts and check for wear or damage. Replace if necessary Noisy gears Check for wear and damage including speedometer gear and replace if necessary Noise in 4 H or 4L Worn or damaged sprockets Disassemble and check for or drive chain wear and damage. Replace if necessary Incorrect tire pressure Adjust tire pressure Transfer case oil leakage Cracked transfer case Replace the case Leakage from other parts Clean case and parts and check for leakage Breather clogging Remove breather with breather adapter and clean it. Replace if necessary Oil level higher than required Use specified oil. Adjust oil improper brand of oil being used level Loosened sealing bolts Re-tighten Improper brand of sealant or Use specified sealant and improperly applied sealant retighten Worm or damaged oil seal Replace oil seal
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