Automatic Transmission/Transaxle: Testing and Inspection
Engine Does Not Start In N Or P
1. Defective ignition switch and or starter.
2. Incorrectly adjusted range selector linkage.
3. Defective ignition switch or wiring
Engine Starts In Ranges Other Than N & P
1. Incorrectly adjusted range selector linkage.
2. Defective inhibitor or wiring.
Vehicle Does Not Move In D, Moves In 1, 2 & R
1. Incorrectly adjusted range selector linkage.
2. Fluid pressure too low or too high.
3. Defective control valve body.
4. Defective one way clutch.
Vehicle Does Not Move In Forward Ranges, Extremely Poor Acceleration
1. Fluid level low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. fluid pressure too high or too low.
4. Defective control valve body.
5. Perform transmission air check.
6. Defective rear clutch.
7. Problem in hydraulic circuit.
Vehicle Does Not Move In R, Extremely Poor Acceleration
1. Fluid level low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Perform transmission air check.
6. Defective 2nd brake band.
7. Defective front clutch.
8. Defective rear clutch.
9. Problem in hydraulic circuit.
Vehicle Does Not Move In Any Range
1. Fluid level low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Perform transmission air check.
6. Defective oil pump.
7. Problem in hydraulic circuit.
8. Incorrectly adjusted parking linkage.
9. Defective direct clutch.
Slippage Felt When Accelerating
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Perform transmission air check.
6. Defective vacuum diaphragm or spring.
7. Defective oil pump.
8. Problem in hydraulic circuit.
Vehicle Moves In N
1. Incorrectly adjusted range selector linkage.
2. Defective control valve body.
3. Defective rear clutch.
Excessive Creep
1. Engine mechanical problem.
No Creep At All
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Engine mechanical problem.
4. Defective control valve body.
5. Defective oil pump.
6. Problem in hydraulic circuit.
7. Defective rear clutch.
8. Defective front clutch.
Low Maximum Speed & Poor Acceleration
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Engine stall speed too high or too low.
4. Fluid pressure too high or too low.
5. Defective control valve body.
6. Engine mechanical problem.
7. Defective 2nd brake band.
8. Defective low and reverse brake.
9. Defective direct clutch.
10. Defective front clutch.
11. Defective rear clutch.
12. Defective oil pump.
Does Not Shift From 1 To 2
1. Incorrectly adjusted range selector linkage.
2. Defective vacuum diaphragm or spring.
3. Defective kickdown solenoid, kickdown switch or wiring.
4. Defective control valve body.
5. Defective governor valve.
6. Defective 2nd band servo.
7. Perform transmission air check.
8. Defective rear clutch.
9. Defective 2nd brake band.
10. Problem in hydraulic circuit.
Does Not Shift From 2 To 3
1. Incorrectly adjusted range selector linkage.
2. Defective vacuum diaphragm or spring.
3. Defective kickdown solenoid, kickdown switch or wiring.
4. Defective control valve body.
5. Defective governor valve.
6. Defective 2nd band servo.
7. Perform transmission air check.
8. Defective front clutch.
9. Problem in hydraulic circuit.
Does Not Shift From 3 To OD
1. Incorrectly adjusted range selector linkage.
2. Defective vacuum diaphragm or spring.
3. Defective kickdown solenoid, kickdown switch or wiring.
4. Defective control valve body.
5. Defective governor valve.
6. Defective OD band servo.
7. Perform transmission air check.
8. Defective OD control switch.
9. Defective OD cancel solenoid.
10. Defective direct clutch.
11. Defective OD brake band.
12. Defective OD cancel valve.
Lockup Does Not Occur In OD
1. Defective governor valve.
2. Defective OD band servo.
3. Defective lockup control solenoid or vacuum switch.
4. Defective OD brake band.
5. Defective lockup control valve.
Does Not Shift From 4 To 3
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Defective control valve body.
4. Defective governor valve.
5. Perform transmission air check.
6. Defective OD control switch.
7. Defective OD cancel solenoid.
8. Defective direct clutch.
9. Defective front clutch.
10. Defective OD brake band.
11. Problem in hydraulic circuit.
12. Defective OD cancel valve.
Does Not Shift From 3 To 2 Or From 4 To 2
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Defective control valve body.
4. Defective governor valve.
5. Defective 2nd band servo.
6. Perform transmission air check.
7. Defective front clutch.
8. Defective OD brake band.
9. Defective 2nd brake band.
10. Problem in hydraulic circuit.
Does Not Shift from 2 To 1 Or From 3 To 1
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Defective control valve body.
4. Defective governor valve.
5. Defective 2nd band servo.
6. Perform transmission air check.
7. Defective 2nd brake band.
8. Defective one way clutch.
Does Not Kickdown When Accelerator Is Depressed In 3 Within Kickdown Range
1. Fluid level too low or fluid contaminated.
2. Defective kickdown solenoid, kickdown switch or wiring.
3. Defective vacuum diaphragm or spring.
4. Defective control valve body.
5. Defective governor valve.
6. Defective 2nd brake band.
7. Problem in hydraulic circuit.
Does Not kickdown When Accelerator Is Depressed In 4 Within Kickdown Range
1. Fluid level too low or fluid contaminated.
2. Defective kickdown solenoid, kickdown switch or wiring.
3. Defective vacuum diaphragm or spring.
4. Defective control valve body.
5. Defective governor valve.
6. Defective direct clutch.
7. Problem in hydraulic circuit.
Excessive Engine Speed When Accelerated In 3 Due To Delayed Kickdown
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Defective governor valve.
6. Perform transmission air check.
7. Defective front clutch.
8. Problem in hydraulic circuit.
Excessive Engine Speed When Accelerated In 4 Due To Delayed Kickdown
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Fluid pressure too high or too low.
4. Defective control body.
5. Defective governor valve.
6. Perform transmission air check.
7. Defective OD brake band.
8. Problem in hydraulic circuit.
Does Not Shift From 3 To 2 On D To 2 Shift
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Defective control valve body.
4. Defective governor valve.
5. Defective 2nd band servo.
6. Defective front clutch.
7. Defective 2nd brake band.
8. Problem in hydraulic circuit.
Does Not Shift From 3 To 2 On D To 1 Shift
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Defective governor valve.
6. Defective 2nd band servo.
7. Defective front clutch.
8. Defective 2nd brake band.
9. Problem in hydraulic circuit.
Excessive N To D Shifting Shock
1. Engine mechanical problem.
2. Defective vacuum diaphragm or spring.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Defective rear clutch.
Excessive 1 To 2 Shifting Shock
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Engine stall speed too high or too low.
4. Defective 2nd band servo.
5. Perform transmission air check.
6. Defective 2nd brake band.
7. Defective lockup solenoid valve.
Excessive 2 To 3 Shifting Shock
1. Defective vacuum diaphragm or spring.
2. Fluid pressure too high or too low.
3. Defective control valve body.
4. Defective 2nd band servo.
5. Defective 2nd brake band.
6. Defective lockup control valve.
Excessive 3 To 4 Shifting Shock
1. Defective vacuum diaphragm or spring.
2. Fluid pressure too high or too low.
3. Defective control valve body.
4. Defective OD brake band.
5. Defective lockup control valve.
Vehicle Braked When Shifted From 1 To 2
1. Fluid level too low or fluid contaminated.
2. Defective control valve body.
3. Defective low 7 reverse brake.
4. Defective front clutch.
5. Defective one way clutch.
Vehicle Braked When Shifted From 2 To 3
1. Fluid level too low or fluid contaminated.
2. Defective 2nd band servo.
3. Defective control valve body.
4. Defective 2nd brake band.
Vehicle Braked When Shifted From 3 To 4
1. Fluid level too low or fluid contaminated.
2. Defective 2nd band servo.
3. Defective control valve body.
4. Defective OD brake band.
5. Problem in hydraulic circuit.
Shift Shock felt When Accelerator Is Released & Deceleration Occurs
1. Incorrectly adjusted range selector linkage.
2. Defective vacuum diaphragm or spring.
3. Defective kickdown solenoid, kickdown switch or wiring.
4. Fluid pressure too high or too low.
5. Defective control valve body.
6. Defective governor valve.
7. Defective accumulator.
8. Problem in hydraulic circuit.
Excessively Large 2 To 1 Shock In 1 Range
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Engine stall speed too high or too low.
4. Fluid pressure too high or too low.
5. Defective control valve body.
6. Defective low and reverse brake.
Excessively High 1 To 2, 2 To 3 & 3 To 4 Shift Point
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Defective kickdown solenoid, kickdown switch or wiring.
4. Fluid pressure too high or too low.
5. Defective control valve body.
6. Defective governor valve.
7. Problem in hydraulic circuit.
Excessively High 4 To 3, 3 To 2 & 2 To 1 Shift Point
1. Incorrectly adjusted range selector linkage.
2. Defective vacuum diaphragm or spring.
3. Defective kickdown solenoid, kickdown switch or wiring.
4. Fluid pressure too high or too low.
5. Defective control valve body.
6. Defective governor valve.
7. Problem in hydraulic circuit.
Kickdown Operates Or Engine Overruns When Depressing Pedal In 3 Beyond Kickdown Vehicle Speed limit
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Defective governor valve.
6. Defective front clutch.
7. Problem in hydraulic circuit.
Kickdown Operates Or Engine Overruns When Depressing Pedal In 4 Beyond Kickdown Vehicle Speed Limit
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Defective governor valve.
6. Defective OD brake band.
7. Problem in hydraulic circuit.
Shifts Directly From 1 To 3
1. Fluid level too low or fluid contaminated.
2. Defective control valve body.
3. Defective governor valve.
4. Perform transmission air check.
5. Defective 2nd brake band.
6. Problem in hydraulic circuit.
Shifts Directly From 2 To 4
1. Fluid level too low or fluid contaminated.
2. Defective control valve body.
3. Defective governor valve.
4. Perform transmission air check.
5. Defective front clutch.
6. Problem in hydraulic circuit.
Shifts From 2 To 1 Or 2 To 3 In 2
1. Incorrectly adjusted range selector linkage.
2. Fluid pressure too high or too low.
3. Defective control valve body.
Shifts From 1 To 2 Or 2 To 3 In 1
1. Incorrectly adjusted range selector linkage.
2. Defective control valve body.
3. Problem in hydraulic circuit.
Practically No Shift Shock, Or Slippage While 1 To 2 Shifting
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Defective vacuum diaphragm or spring.
4. Fluid pressure too high or too low.
5. Defective control valve body.
6. Defective OD band servo.
7. Perform transmission air check.
8. Defective 2nd brake band.
9. Problem in hydraulic circuit.
Practically No Shift Shock Or Slippage While 2 To 3 Shifting
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Defective vacuum diaphragm or spring.
4. Fluid pressure too high or too low.
5. Defective control valve body.
6. Defective OD band servo.
7. Perform transmission air check.
8. Defective front clutch.
9. Problem in hydraulic circuit.
Practically No Shift Shock Or Slippage While 3 To 4 Shifting
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. Defective vacuum diaphragm or spring.
4. Fluid pressure to high or too low.
5. Defective control valve body.
6. Defective OD band servo.
7. Perform transmission air check.
8. Defective OD brake band.
9. Problem in hydraulic circuit.
No Shift Shock Or Engine Runaway In 1 To 2 shift
1. Fluid level too low or fluid contaminated.
2. Incorrectly adjusted range selector linkage.
3. defective vacuum diaphragm or spring.
4. engine mechanical problem.
5. Engine stall speed too high or too low.
6. Defective control valve body.
7. Perform transmission air check.
8. Defective 2nd brake band.
9. Defective oil pump.
Engine Runaway Or Slip When Shifting 4 To 3
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Fluid pressure too high or too low.
4. Defective control valve body.
5. Defective 2nd band servo.
6. Perform transmission air check.
7. Defective direct clutch.
8. Defective front clutch.
9. Defective OD brake band.
10. Problem in hydraulic circuit.
Engine Runaway Or Slip When Shifting 3 To 2
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Fluid pressure too high or too low.
4. Defective 2nd band servo.
5. Perform transmission air check.
6. Defective front clutch.
7. Defective OD brake band.
8. Problem in hydraulic circuit
Transmission Noisy In P & N
1. Fluid level too low Or fluid contaminated.
2. Fluid pressure too high or too low.
3. Defective oil pump.
Transmission Noisy In D, 2, 1 & R
1. Fluid level too low or fluid contaminated.
2. Fluid pressure to high or too low.
3. Defective rear clutch.
4. Defective oil pump.
5. Defective one way clutch.
6. Defective planetary gear.
No Engine Brake In 1
1. Incorrectly adjusted range selector linkage.
2. Fluid pressure too high or too low.
3. Defective control valve body.
4. Perform transmission air check.
5. Defective low and reverse brake.
6. Problem in hydraulic circuit.
Vehicle Moves In P Or Parking Gear Not Disengaged When P Is Disengaged
1. Incorrectly adjusted range selector linkage.
2. Incorrectly adjusted parking linkage.
Transmission Overheats
1. Fluid level too low or fluid contaminated.
2. Defective OD band servo.
3. Defective 2nd band servo.
4. Engine stall speed too high or too low.
5. Fluid pressure too high or to low.
6. Defective control valve body.
7. Perform transmission air check.
8. Defective direct clutch.
9. Defective front clutch.
10. Defective rear clutch.
11. Defective OD brake band.
12. Defective 2nd brake band.
13. Defective low and reverse brake.
14. Defective oil pump.
15. Problem in hydraulic circuit.
16. Defective torque converter.
17. Defective planetary gear.
White Smoke Discharge From exhaust While Running
1. Fluid level too low or fluid contaminated.
2. Defective vacuum diaphragm or spring.
3. Engine stall speed too high or too low.
4. Fluid pressure too high or too low.
5. Defective control valve body.
6. Perform transmission air check.
7. Defective direct clutch.
8. Defective front clutch.
9. Defective rear clutch.
10. Defective OD brake band.
11. Defective 2nd brake band.
12. Defective low and reverse clutch.
13. Defective oil pump.
14. Problem in hydraulic circuit.
15. Defective torque converter.
16. Defective planetary gear.
Abnormal Odor From Oil Level Gauge Pipe
1. Fluid level too low or fluid contaminated.
2. Defective direct clutch.
3. Defective front clutch.
4. Defective rear clutch.
5. Defective OD brake band.
6. Defective 2nd brake band.
7. Defective low and reverse clutch.
8. Defective oil pump.
9. Problem in hydraulic circuit.
10. Defective torque converter.
11. Defective planetary gear.
Transmission Shifts To 4 Even If OD Control Switch Switch Is Turned
1. Defective OD control switch.
2. Defective OD cancel solenoid.
3. Defective OD cancel valve.
Vehicle Surge In OD
1. Defective lockup control solenoid or vacuum switch.