| TIBURON(GK) >2004 > G 2.0 DOHC > Automatic Transaxle System > Automatic Transaxle System>Troubleshooting (F4A42-1) |

INSPECTION PROCESS FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
Communication with the scan tool | Possible cause
If communication with the scan tool is not possible, the cause may be a defective diagnostic trouble line or the TCM is not functioning. |
• | Malfunction of diagnostic trouble line
• | Malfunction of connector
• | Malfunction of the TCM
INSPECTION PROCEDURE 2
Starting impossible | Possible cause
Starting is not possible when the selector lever is in P or N range. In such cases, the cause may be a defective engine system, torque converter or oil pump. |
• | Malfunction of the engine system
• | Malfunction of the torque converter
• | Malfunction of the oil pump
INSPECTION PROCEDURE 3
Does not move | Possible cause
If the vehicle does not move forward when the selector lever is shifted from N to D range while the engine is idling, the cause may be abnormal line pressure or a malfunction of the underdrive clutch or valve body. |
• | Abnormal line pressure
• | Malfunction of the underdrive solenoid valve
• | Malfunction of the underdrive clutch
• | Malfunction of the valve body
INSPECTION PROCEDURE 4
Does not reverse | Possible cause
If the vehicle does not reverse when the selector lever is shifted from N to R range while the engine is idling, the cause may be abnormal pressure in the reverse clutch or low and reverse brake or a malfunction of the reverse clutch, low and reverse brake or valve body. |
• | Abnormal reverse clutch pressure
• | Abnormal low and reverse brake pressure
• | Malfunction of the low and reverse solenoid valve
• | Malfunction of the reverse clutch
• | Malfunction of the low and reverse brake
• | Malfunction of the valve body
INSPECTION PROCEDURE 5
Does not move (forward or reverse) | Possible cause
If the vehicle does not move forward or reverse when the selector lever is shifted to any position while the engine is idling, the cause may be abnormal line pressure, or a malfunction of the power train, oil pump or valve body. |
• | Abonormal line pressure
• | Malfunction of the underdrive solenoid valve
• | Malfunction of the underdrive clutch
• | Malfunction of the valve body
INSPECTION PROCEDURE 6
Engine stalling when shifting | Possible cause
If the engine stalls when the selector lever is shifted from N to D or R range while the engine is idling, the cause may be a malfunction of the engine system, torque converter clutch soledoid, valve body or torque converter (torque converter clutch malfunction). |
• | Malfunction of the engine system
• | Malfunction of the torque converter clutch solenoid
• | Malfunction of the valve body
• | Malfunction of the torque converter (Malfunction of the torque converter clutch)
INSPECTION PROCEDURE 7
Shocks when changing from N to D and range time lag | Possible cause
If abnormal shocks or a time lag of 2 second or more occurs when the selector lever is shifted from N to D range while the engine is idling, the cause may be abnormal underdrive clutch pressure or a malfunction of the underdrive clutch, valve body or closed throttle position switch. |
• | Abnormal line pressure
• | Malfunction of the underdrive solenoid valve
• | Malfunction of the underdrive clutch
• | Malfunction of the valve body
• | Malfunction of the closed throttle position switch
INSPECTION PROCEDURE 8
Shock when changing from N to R and large time lag | Possible cause
If abnormal shocks or a time lag of 2 seconds or more occurs when the selector lever is shifted from N to R range while the engine is idling, the cause may be abnormal reverse clutch pressure or low and reverse brake pressure, or a malfunction or the reverse clutch, low and reverse brake, valve body. |
• | Abnormal reverse clutch pressure
• | Abnormal low and reverse brake pressure
• | Malfunction of the low and reverse solenoid valve
• | Malfunction of the reverse clutch
• | Malfunction of the low and reverse brake
• | Malfunction of the valve body
INSPECTION PROCEDURE 9
Shocks when changine from N to D, N to R and large time lag | Possible cause
If abnormal shocks or a time lag of 2 seconds or more occurs when the selector lever is shifted from N to D, N to R range while the engine is idling, the cause may be abnormal line pressure or a malfunction of the oil pump or valve body. |
• | Abnormal line pressure
• | Malfunction of the oil pump
• | Malfunction of the valve body
INSPECTION PROCEDURE 10
Shocks and running up | Possible cause
If shocks occur when driving due to upshifting or downshifting and the transaxle speed becomes higher than the engine speed, the cause may be abnormal line pressure or a malfunction of a solenoid valve, oil pump, valve body or of a brake or clutch. |
• | Abnormal line pressure
• | Malfunction of each solenoid valve
• | Malfunction of the oil pump
• | Malfunction of the valve body
• | Malfunction of each brake or each clutch
INSPECTION PROCEDURE 11
All points (Displaced shifting points) | Possible cause
If all shift points are displaced while driving, the cause may be a malfunction of the output shaft speed sensor, TPS or a solenoid valve. |
• | Malfunction of the output shaft speed sensor
• | Malfunction of the throttle position sensor
• | Malfunction of each solenoid valve
• | Abnormal line pressure
• | Malfunction of the valve body
• | Malfunction of the TCM
INSPECTION PROCEDURE 12
Some points (Displaced shifting points) | Possible cause
If some of the shift points are displaced while driving, the cause may be a malfunction of the valve body, or it is related to control and is not an abnormality. |
• | Malfunction of the valve body
INSPECTION PROCEDURE 13
No diagnostic trouble codes (Does not shift) | Possible cause
If shifting does not occur while driving and no diagnostic trouble codes are given, the cause may be a malfunction of the Park/Neutral position switch, or TCM. |
• | Malfunction of the Park/Neutral position switch
• | Malfunction of the TCM
INSPECTION PROCEDURE 14
Poor acceleration | Possible cause
If acceleration is poor even if downshifting occurs while driving, the cause may be a malfunction of the engine system or of a brake or clutch. |
• | Malfunction of the engine system
• | Malfunction of the brake or clutch
INSPECTION PROCEDURE 15
Vibration | Possible cause
If vibration occurs when driving at constant speed or when accelerating in top range, the cause may be abnormal torque converter clutch pressure or a malfunction of the engine system, torque converter clutch solenoid, torque converter or valve body. |
• | Abnormal torque converter clutch pressure
• | Malfunction of the engine system
• | Malfunction of the torque converter clutch solenoid
• | Malfunction of the torque converter
• | Malfunction of the valve body