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Do not check for leaks with your hands. Pin hole (very small) leaks can result in a high velocity oil stream that will be invisible close to the hose. This oil can penetrate the skin and cause personal injury. Use cardboard or paper to locate pin hole leaks. |
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- Check the oil level for the torque converter and the transmission. Refer to Operation and Maintenance Manual, SEBU8197, "Torque Converter and Transmission Oil Level - Check".
Note: Many problems in the transmission are caused by low oil levels or by air in the oil. If the transmission has not been operated for an extended period of time, the oil level will be high. An accurate oil level check can be performed when the oil is at operating temperature.
- Check for leaks.
Inspect all oil lines, hoses, and connections for damage or for leaks.
Note: If oil can leak out of a fitting or a connection, air can leak into the system. Air in the system can be as bad as a low amount of oil.
- Check the electrical system.
Inspect the harnesses, the electrical connectors and the fuse for the ECM. Refer to Electrical Schematic, KENR6699.
With the engine start switch and the battery disconnect switch in the OFF position, check the 20 ampere fuse for the Electronic Control Module. If the fuse is open, replace the fuse.
Inspect the electrical harnesses for damaged wires or for broken wires. Disconnect each connector and look for pins and sockets that have been bent, broken, or removed. Look for any foreign material inside the connectors. The connectors must be tightened with normal force. The connectors must be disconnected with the same amount of force.
Check the Electronic Control Module. Refer to Systems Operation, Troubleshooting, Testing and Adjusting, KENR5902, "Power Train Electronic Control System".
- Check the filters and the screens.
Inspect the transmission oil filter. Refer to Operation and Maintenance Manual, SEBU8197, "Torque Converter and Transmission Oil Filter - Replace" and Operation and Maintenance Manual, SEBU8197, "Oil Filter - Inspect".
Inspect the torque converter scavenge screen and clean the torque converter scavenge screen. Refer to Operation and Maintenance Manual, SEBU8197, "Torque Converter Scavenge Screen - Clean".
Remove some of the oil from the housing of the transmission oil filter. Remove the filter. Cut apart the filter and inspect the filter element for foreign materials. Also, inspect the transmission scavenge screen and the transmission magnetic screen. A magnet separates the ferrous particles from the nonferrous particles.
This is a list of some of the particles that may be found in the filter element:
- Aluminum particles give the indication of torque converter failure.
- Bronze particles give the indication of sleeve bearing failure.
- Rubber particles give the indication of rubber seal or hose failure.
- Shiny steel particles give the indication of pump, bearing, or gear failure.
- Iron chips, steel chips or plastic particles give the indication of broken components in transmission or transfer gears.
Note: The transmission oil filter has a bypass valve. A bypass valve allows oil to bypass the oil filter elements when the inlet pressure to the oil filter rises due to a blockage in the oil filter. Any oil that does not go through the filter elements goes directly in the hydraulic circuit. Dirty oil causes restrictions in the valve orifices, sticking valves, etc.
If any contamination is found in the filter elements or the screens, all the components of the transmission hydraulic system must be cleaned. Do not use any damaged parts. Any damaged parts must be removed and new parts must be installed.
- Aluminum particles give the indication of torque converter failure.