Lexus IS250 · Service Manual TRANSMISSION

PROBLEM SYMPTOMS TABLE

Troubleshooting

Use the table below to help you find the cause of the problem. The numbers indicate the ranked order of probability of each of the possible causes. Check each part in order. Replace parts as necessary.
CLUTCH SYSTEM: 
Symptom
Suspected area
See page
Clutch grabs / chatters
1. Engine mounting (loose)
-
2. Clutch disc assembly (runout is excessive)
Click here
3. Clutch disc assembly (oily)
Click here
4. Clutch disc assembly (worn out)
Click here
5. Clutch disc (glazed)
Click here
6. Diaphragm spring (tip is out of alignment)
-
Clutch pedal is spongy
1. Clutch line (air in line)
Click here
2. Master cylinder cup (damaged)
-
3. Release cylinder rubber (damaged)
Click here
Clutch is noisy
1. Release bearing (worn, dirty, or damaged)
Click here
Clutch slips
1. Clutch pedal (free play is out of adjustment)
Click here
2. Clutch disc (oily)
Click here
3. Clutch disc (worn out)
Click here
4. Diaphragm spring (damaged)
-
5. Flywheel (distorted)
Click here
Clutch does not disengage
1. Clutch pedal (free play is out of adjustment)
Click here
2. Clutch line (air in line)
Click here
3. Master cylinder (damaged)
Click here
4. Master cylinder cup (damaged)
-
5. Release cylinder cup (damaged)
Click here
6. Clutch disc assembly (out of true)
Click here
7. Clutch disc assembly (runout is excessive)
Click here
8. Clutch disc assembly (lining is broken)
Click here
9. Clutch disc assembly (dirty or burned)
Click here
10. Clutch disc assembly (oily)
Click here
11. Clutch disc assembly (lack of spline grease)
Click here
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