4. Oil Cooler Flow Check

After the new or repaired transmission has been installed, fill to the proper level with DIAMOND ATF SPIII, DIAMOND ATF SPII M or equivalent automatic transmission fluid. The flow should be checked using the following procedure:

1. Disconnect the cooler line at the transmission and place a collecting container under the disconnected line.
   CAUTION: With the fluid set at the proper level, fluid collection should not exceed one quart of internal damage to the transmission may occur.
2. Run the engine at curb idle speed, with the shift selector in neutral.
3. If fluid flow is intermittent or it takes more than 20 seconds to collect one quart of ATF, replace the cooler.
4. If flow is found to be within acceptable limits, reconnect the cooler line. Then fill transmission to the proper level, using the approved type of automatic transmission fluid.

Fig 1: Checking Oil Cooler Flow

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.