Symptom:
*TRANSMISSION NOISY WITH NO DTC’S PRESENT
POSSIBLE CAUSES
INTERNAL TRANSMISSION PROBLEM - NOISY
INTERNAL TRANSMISSION PROBLEM - NOISY WHILE STANDING STILL
TEST ACTION APPLICABILITY
1 Check and adjust the oil level per the Service Information before continuing.
Place vehicle on hoist.
Run vehicle on hoist under conditions necessary to duplicate the noise.
CAUTION: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING
WHEELS.
Using Chassis Ears or other suitable device, verify that the noise is coming from the
transmission.
Is the noise coming from the transmission?
All
Yes → Go To 2
No → Test Complete.
2 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
Yes → Go To 3
No → Go To 4
3 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.
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. Pay particular
attention to bearings, pinion gears, etc. Repair or replace as
necessary.
176
TRANSMISSION - NGC
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