The cause of most external leaks can be located and repaired with the transmission in the vehicle. There are three methods for locating automatic transmission fluid leaks.

1. Verify that the leak is transmission fluid.
2. Thoroughly clean the suspected leak area.
3. Drive the vehicle for 24 km (15 miles) or until normal operating temperatures are reached.
4. Park the vehicle over clean paper or over cardboard.
5. Turn the ignition switch off.
6. Wait for approximately 30 minutes.
7. Inspect the paper for spots. Determine the position of the spots in relation to the position of the paper under the transmission assembly.
8. Make the necessary repairs.

1. Thoroughly clean the suspected leak area with solvent.
2. Apply an aerosol powder or a baby powder to the suspected leak area.
3. Drive the vehicle for 24 km (15 miles) or until the normal operating temperatures are reached.
4. Turn the ignition switch off.
5. Inspect the suspected leak area, and trace the leak path through the powder in order to find the source.
6. Make the necessary repairs.

Tools Required

1. Add 30 ml (1 oz) of J 28431-6 into the automatic transmission fluid filler tube.
2. Drive the vehicle for 24 km (15 miles) or until normal operating temperatures are reached.
3. Turn the ignition switch off.
4. Use a J 28428-E in order to locate the source of the leak.
5. Make the necessary repairs.