AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT)(D) > General Diagnostic Table
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Symptom |
Problem parts |
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Starter does not operate when select lever is in “P” or “N” range. Starter rotates when select lever is in “R”, “D”, “3” or “2” range. |
• Inhibitor switch • Select cable • Select lever • Starter motor and harness |
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Abnormal noise when select lever is in “P” or “N”. |
• Strainer • Transfer duty solenoid • Oil pump • Drive plate • ATF level too high or too low |
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Hissing noise occurs during standing start. |
• Strainer • ATF level too high or too low |
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Noise occurs while driving in “D1”. |
• Final gear • Planetary gear • Reduction gear • Differential gear oil level too high or too low |
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Noise occurs while driving in “D2”. | |
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Noise occurs while driving in “D3”. |
• Final gear • Low & reverse brake • Reduction gear • Differential gear oil level too high or too low |
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Noise occurs while driving in “D4”. |
• Final gear • Low & reverse brake • Planetary gear • Reduction gear • Differential gear oil level too high or too low |
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Engine stalls while shifting from “1” range to another. |
• Control valve • Lock-up damper • Engine performance • Input shaft |
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Vehicle moves when select lever is in “N” range. |
• Select cable • Inhibitor switch • TCM • Low clutch |
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Shock occurs when select lever is shifted from “N” to “D” range. |
• Accelerator pedal position sensor • ATF temperature sensor • Line pressure linear solenoid • Low clutch duty solenoid • Low clutch • TCM • Harness • Control valve • ATF deterioration |
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Excessive time lag occurs when select lever is shifted from “N” to “D” range. |
• Control valve • Low clutch • Line pressure linear solenoid • Seal ring • Front gasket of transmission case |
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Shock occurs when the select lever is moved from “N” to “R” range. |
• Accelerator pedal position sensor • ATF temperature sensor • Line pressure linear solenoid • TCM • Harness • Control valve • ATF deterioration |
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Excessive time lag occurs when the select lever is moved from “N” to “R” range. |
• Control valve • Low & reverse clutch • Reverse clutch • Line pressure linear solenoid • Seal ring • Front gasket of transmission case |
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Vehicle does not start in any shift range. (Engine stalls) |
• Parking brake mechanism • Planetary gear |
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Vehicle does not start in any shift range. (Engine operates) |
• Strainer • Line pressure linear solenoid • Control valve • Drive pinion • Hypoid gear • Axle shaft • Differential gear • Oil pump • Input shaft • Output shaft • Planetary gear • Drive plate • ATF level is too low • Front gasket of transmission case |
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Vehicle does not start in “R” range only. (Engine operates) |
• Select cable • Select lever • Line pressure linear solenoid • Control valve • Low & reverse clutch • Reverse clutch |
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Vehicle does not start in “R” range only. (Engine stalls) |
• Low clutch • 2-4 brake • Planetary gear • Parking brake mechanism |
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Vehicle does not start in only when in the “D”, “3” range. (Engine operates) |
• Low clutch • One-way clutch |
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Vehicle does not start in only in the “D”, “3” or “2” range. (Engine operates) |
Low clutch |
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Vehicle does not start in only in the “D”, “3” or “2” range. (Engine stalls) |
Reverse clutch |
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Vehicle does not start in “R” range only. (Engine operates) |
Control valve |
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Acceleration during standing start is poor. (High rpm stall) |
• Control valve • Low clutch • Reverse clutch • ATF level is too low • ATF deterioration • Front gasket of transmission case • Differential gear oil level too high or too low |
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Acceleration during standing start is poor. (Low rpm stall) |
• Oil pump • Torque converter one-way clutch • Engine performance |
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Acceleration is poor when select lever is in the “D”, “3” or “2” range. (Normal rpm stall) |
• TCM • Control valve • High clutch • 2-4 brake • Planetary gear |
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Acceleration is poor when select lever is in “R” range. (Normal rpm stall) |
• Control valve • High clutch • 2-4 brake • Planetary gear |
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No shift occurs from 1st to 2nd gear. |
• TCM • Rear vehicle speed sensor • Front vehicle speed sensor • Accelerator pedal position sensor • Control valve • 2-4 brake |
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No shift occurs from 2nd to 3rd gear. |
• TCM • Control valve • High clutch |
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No shift occurs from 3rd to 4th gear. |
• TCM • ATF temperature sensor • Control valve • 2-4 brake |
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Engine brake does not come into effect when the select lever is shifted to “3” range. |
• Inhibitor switch • TCM • Accelerator pedal position sensor • Control valve |
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Engine brake is not effected when the select lever is in “3” or “2” range. |
Control valve |
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Engine brake does not come into effect when the select lever is shifted to “1” range. |
• Control valve • Low & reverse brake |
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Shift characteristics are erroneous. |
• Inhibitor switch • TCM • Front vehicle speed sensor • Rear vehicle speed sensor • Accelerator pedal position sensor • Control valve • Ground |
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No lock-up occurs. |
• TCM • Accelerator pedal position sensor • ATF temperature sensor • Control valve • Lock-up facing • Engine speed signal |
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Parking brake does not function. |
• Select cable • Select lever • Parking mechanism |
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Shift lever cannot be moved or is hard to move from “P” range. | |
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ATF spurts out. |
ATF level too high |
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Differential oil spurts out. |
Differential gear oil level too high |
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Differential oil level changes excessively. |
• Seal pipe • Double oil seal |
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Odor is produced from ATF supply pipe. |
• High clutch • 2-4 brake • Low & reverse clutch • Reverse clutch • Lock-up facing • ATF deterioration |
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Shock occurs when shifting from 1st to 2nd gear. |
• TCM • Torque converter turbine speed sensor • Accelerator pedal position sensor • 2-4 brake duty solenoid • ATF temperature sensor • Line pressure linear solenoid • Control valve • 2-4 brake • ATF deterioration • Engine performance • Low & reverse duty solenoid |
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Slippage occurs when shifting from 1st to 2nd gear. |
• TCM • Accelerator pedal position sensor • 2-4 brake duty solenoid • ATF temperature sensor • Line pressure linear solenoid • Control valve • 2-4 brake |
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Shock occurs when shifting from 2nd to 3rd gear. |
• TCM • Torque converter turbine speed sensor • Accelerator pedal position sensor • 2-4 brake duty solenoid • ATF temperature sensor • Line pressure linear solenoid • Low & reverse duty solenoid • Control valve • High clutch • 2-4 brake • ATF deterioration • Engine performance • High clutch duty solenoid |
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Slippage occurs when shifting from 2nd to 3rd gear. |
• TCM • Accelerator pedal position sensor • 2-4 brake duty solenoid • ATF temperature sensor • Line pressure linear solenoid • Control valve • High clutch • 2-4 brake • Low & reverse duty solenoid |
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Shock occurs when shifting from 3rd to 4th gear. |
• TCM • Torque converter turbine speed sensor • Accelerator pedal position sensor • 2-4 brake duty solenoid • ATF temperature sensor • Line pressure linear solenoid • Control valve • Low clutch duty solenoid • 2-4 brake • ATF deterioration • Engine performance |
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Slippage occurs when shifting from 3rd to 4th gear. |
• TCM • Accelerator pedal position sensor • 2-4 brake duty solenoid • ATF temperature sensor • Line pressure linear solenoid • Control valve • 2-4 brake |
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Shock occurs when select lever is shifted from “3” range to “2” range. |
• TCM • Torque converter turbine speed sensor • Accelerator pedal position sensor • ATF temperature sensor • Line pressure linear solenoid • Control valve • 2-4 brake duty solenoid • 2-4 brake • ATF deterioration • High clutch duty solenoid |
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Shock occurs when select lever is shifted from “D” range to “1” range. |
• TCM • Torque converter turbine speed sensor • Accelerator pedal position sensor • ATF temperature sensor • Line pressure linear solenoid • Control valve • ATF deterioration • Low & reverse brake duty solenoid • Low & reverse clutch |
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Shock occurs when select lever is shifted from “2” range to “1” range. |
• TCM • Torque converter turbine speed sensor • Accelerator pedal position sensor • ATF temperature sensor • Line pressure linear solenoid • Control valve • Low & reverse clutch • ATF deterioration • 2-4 brake duty solenoid • Low & reverse brake duty solenoid |
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Shock occurs when accelerator pedal is released from medium speed. |
• TCM • Accelerator pedal position sensor • ATF temperature sensor • Line pressure linear solenoid • Control valve • Lock-up damper • Engine performance |
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Vibration occurs during straight-forward operation. |
• TCM • Lock-up duty solenoid • Lock-up facing • Lock-up damper • Hold switch |
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Vibration occurs during turns. (Tight corner braking phenomenon) |
• TCM • Front vehicle speed sensor • Rear vehicle speed sensor • Accelerator pedal position sensor • ATF temperature sensor • Transfer clutch • Transfer valve • Transfer duty solenoid • ATF deterioration • Harness • Hold switch |
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Front wheel slippage occurs during standing starts. |
• TCM • Front vehicle speed sensor • Accelerator pedal position sensor • ATF temperature sensor • Control valve • Transfer clutch • Transfer valve • Transfer pipe • Transfer duty solenoid |
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It is not set in FWD mode. |
• TCM • Transfer clutch • Transfer valve • Transfer duty solenoid |
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Select lever is hard to move. |
• Select cable • Select lever • Detent spring • Manual plate |
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Select lever is excessively hard to move. (Unreasonable resistance) |
• Detent spring • Manual plate |
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Select lever slips out of selected shift position during acceleration or while driving on rough terrain. |
• Select cable • Select lever • Detent spring • Manual plate |