Symptom:
*TRANSMISSION NOISY WITH NO DTC'S PRESENT
POSSIBLE CAUSES
INCORRECT FLUID LEVEL
INTERNAL TRANSMISSION PROBLEM - NOISY
INTERNAL TRANSMISSION PROBLEM - NOISY WHILE STANDING STILL
TEST ACTION APPLICABILITY
1 Check the Transmission Fluid Level per the Service Information.
Is the fluid level OK?All
Ye s®Go To 2
No®Adjust fluid level and repair cause of incorrect fluid level.
2 Place vehicle on hoist.
WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING
WHEELS.
Run vehicle on hoist under conditions necessary to duplicate the noise.
NOTE: It may be necessary to test drive the vehicle to duplicate the noise.
Using Chassis Ears or other suitable listening device, verify the source of the noise.
Is the noise coming from the transmission?All
Ye s®Go To 3
No®Test Complete.
3 With the shift lever in neutral, raise the engine speed and listen to the noise.
NOTE: THE RADIO MUST BE TURNED OFF. Alternator noise can come
through the speakers and be misinterpreted as Transmission Pump Whine.
This can happen even with the volume turned down.
Does the noise get louder or change pitch while the engine speed is changing?All
Ye s®Go To 4
No®Go To 5
4 If there are no possible causes remaining, view repair. All
Repair
Repair internal transmission problem as necessary. Inspect all of
the transmission components for signs of wear. If no problems
found, replace the Transmission oil pump..
5 If there are no possible causes remaining, view repair. All
Repair
Repair internal transmission problem as necessary. Inspect all of
the transmission components for signs of wear. Pay particular
attention to bearings, pinion gears, etc. Repair or replace as
necessary.
154
TRANSMISSION
