Transmission & Oil Cooler Flow Check
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- Disconnect both hoses from the oil cooler pipes. Connect the oil cooler feed pipe (bottom connector) to the transmission and the return pipe (top connector) (may require J 35944-600) to the discharge hose (5). Clip the discharge hose (5) onto the empty oil drain container. See Figure .
- Confirm the transmission is filled with ATF. See CHECKING FLUID LEVEL & CONDITION (4L60-E)
or CHECKING FLUID LEVEL & CONDITION (4L80-E)
. Start the engine with the transmission in PARK range and run for 30 seconds. A minimum of 2 qts. (1.9L) must be discharged during this 30-second run time. If fluid flow is greater than 2 qts. (1.9L) in 30 seconds, go to next step. If fluid flow is less than 2 qts. (1.9L) in 30 seconds, perform the following diagnosis: Disconnect the oil cooler feed line at the radiator. Connect the discharge hose (5) to the cooler feed line. Clip the discharge hose (5) to the empty oil drain container. See Figure
. Start the engine with the transmission in PARK range and run for 30 seconds. A minimum of 2 qts. (1.9L) must be discharged during this 30-second run time. Perform the following according to the flow rate:
- Insufficient feed flow: Inspect the transmission.
- Sufficient feed flow: Inspect the oil cooler return pipe and the oil cooler (and auxiliary cooler, if equipped).
- Remove the discharge hose (5), reconnect the cooler feed and return pipes to the transmission and fill transmission with appropriate fluid to proper level. See RECOMMENDED FLUIDS and FLUID CAPACITIES . Inspect the transmission oil cooler pipe connections at the radiator, the auxiliary cooler (if equipped) and the transmission for leaks.