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Mechanical Faults without Trouble Codes
Note: Transmission
faults may be purely mechanical and do not always affect
transmission function. The following tables help to localise
faults.
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Loud fluttering noise in selector lever position N
or P (stationary vehicle, engine running at idle speed)
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Probable Cause
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Remedy
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Description in operation
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Incorrect fluid level
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Check fluid level
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"Transmission Fluid Level, Check and Correct"
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Converter malfunction
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Replace converter
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"Transmission, Replace"
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Fluid pump malfunction
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Check transmission fluid condition, disassemble and clean fluid
pump if necessary.
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"Transmission Fluid Condition, Check", "Assemblies, Remove and
Install", "Fluid Pump, Disassemble and Assemble"
|
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Internal transmission failure
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
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"Transmission Fluid Condition, Check"
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Mechanical Faults without Trouble Codes
(Continued)
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Screeching noise in selector lever position N or P
(stationary vehicle, engine running at idle speed)
|
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Probable Cause
|
Remedy
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Description in operation
|
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Loose fastening bolt on drive disc
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Replace fastening bolt and tightening in accordance with
required tightening torque.
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"Recommended Torque Values"
|
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Broken drive disc
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Replace drive disc
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"Drive Disk, Remove and Install" in group "J".
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Transmission not properly attached to engine
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Check engine/transmission alignment, retighten fastening bolts
with required torque.
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"Recommended Torque Values"
|
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Converter scrapes transmission housing
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Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
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"Transmission Fluid Condition, Check"
|
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Internal transmission failure
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
|
"Transmission Fluid Condition, Check"
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Mechanical Faults without Trouble Codes
(Continued)
|
Screeching noise when in gear (stationary vehicle,
engine running at idle speed)
|
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Probable Cause
|
Remedy
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Description in operation
|
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Worn bushing in fluid pump
|
Check transmission fluid condition, if necessary replace fluid
pump.
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"Transmission Fluid Condition, Check", "Assemblies, Remove and
Install", "Fluid Pump, Disassemble and Assemble"
|
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Internal transmission failure
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
|
"Transmission Fluid Condition, Check"
|
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Loud knocking or metallic noises in every gear
except for in 4th gear
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Probable Cause
|
Remedy
|
Description in operation
|
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Internal transmission failure
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
|
"Transmission Fluid Condition, Check"
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Mechanical Faults without Trouble Codes
(Continued)
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Leakage between engine and transmission when
vehicle is stationary and engine is running
|
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Probable Cause
|
Remedy
|
Description in operation
|
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Fluid level too high
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Check fluid level
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"Transmission Fluid Level, Check and Correct"
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Transmission not properly attached to engine
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Retighten fastening bolts with required torque.
|
"Recommended Torque Values"
|
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Fluid pump bushing damaged or loose
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Check transmission fluid condition, if necessary replace fluid
pump.
|
"Transmission Fluid Condition, Check", "Assemblies, Remove and
Install", "Fluid Pump, Disassemble and Assemble"
|
|
Fluid pump seal ring
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Replace fluid pump seal ring
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"Transmission, Replace"
|
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Converter neck damaged or faulty
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Replace converter and fluid pump seal ring
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"Transmission, Replace"
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Mechanical Faults without Trouble Codes
(Continued)
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Leakage when vehicle is stationary
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Probable Cause
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Remedy
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Description in operation
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Leakage occurring at or around seals
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Check axle shaft seals, fluid cooler lines and connections,
transmission housing and sealing points.
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"Brake Band Servo Cover and/or Seal, Replace", "Seal Ring
– Selector Lever Shaft for Transmission, Replace", "Seal Ring
in Transmission Nose Piece, Replace", "Transmission Nose Piece,
Seal or Replace", "Transmission Fluid Pan (Main Housing), Remove
and Install and/or Replace Seal", "Transmission Fluid Pan
(Intermediate Housing), Remove and Install and/or Replace Seal",
"Sensor – Transmission Output Speed and/or Seal Ring,
Replace", "Fluid Cooler Lines (Feed and Return) –
Transmission, Remove and Install", or "Assemblies, Remove and
Install".
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