Servicing: Diagnosis Infiniti M45 II

Oil Cooler Diagnosis Procedure

Note. Insufficient cleaning of the cooler inlet hose exterior may lead to inaccurate debris identification.

Scheme 1

1. Position an oil pan under the transmission inlet and outlet cooler hoses.
2. Clean the exterior and tip of the cooler inlet hose.
3. Insert the extension adaptor hose of a can of Transmission Cooler Cleaner (P/N 999MP-AM006) or, equivalent, into the cooler outlet hose. see scheme 4 CAUTION: Wear safety glasses and rubber gloves when spraying the Transmission Cooler Cleaner. Spray cooler cleaner only with adequate ventilation. Avoid contact with eyes and skin. Do not breath vapors or spray mist.
4. Hold the hose as high as possible and spray transmission cooler cleaner in a continuous stream into the cooler outlet hose until fluid flows out of the cooler inlet hose for 5 seconds.
5. Tie a common white, basket-type coffee filter to the end of the cooler inlet hose. (Scheme 1)
6. Insert the tip of an air gun into the end of the cooler outlet hose.
7. Wrap a shop rag around the air gun tip and end of cooler outlet hose.
8. Blow compressed air regulated to 70-130 psi through the cooler outlet hose to force any remaining transmission fluid into the coffee filter.
9. Remove the coffee filter from the end of the cooler inlet hose.
10. Perform «OIL COOLER INSPECTION»(ref-166940-S34919018902004100600000).

Oil Cooler Inspection

Inspect the coffee filter for debris.

1. If small metal debris less than .040 in. (1.0 mm) in size or metal powder is found in the coffee filter, this is normal. If normal debris is found, the transmission fluid cooler/radiator can be reused and the procedure is ended.
2. If one or more pieces of debris are found that are over .040 in. (1.0 mm) in size and/or peeled clutch facing material is found in the coffee filter, the fluid cooler is not serviceable. The transmission fluid cooler/radiator must be replaced and the inspection procedure is ended.