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 NO.6 LOW MAXIMUM SPEED AND POOR ACCELERATION [JA5AX-EL]

NO.6 LOW MAXIMUM SPEED AND POOR ACCELERATION [JA5AX-EL]

id050305801100

6

Low maximum speed and poor acceleration

DESCRIPTION

• Vehicle acceleration poor at start.
• Delayed acceleration when accelerator pedal depressed while driving.

POSSIBLE CAUSE

• If clutch is stuck or does not stay in 4GR, malfunction is in engine circuit.
- Clutch slipped, burned
• Line pressure low
• Incorrect throttle position signal
• Malfunction of VSS
• Malfunction of input/turbine speed sensor
• Malfunction of sensor ground
• Malfunction of shift solenoids A, B, or C
• Malfunction of body ground
• Malfunction of control valve body
- Transaxle fixed in 4GR (Operation of fail-safe function)
• Short or open circuit in wiring
• Poor connection of connector
• Electronic parts of output and input system malfunction are malfunctioning
- Insufficient starting torque (Suspected when in-gear condition, shift control and engine circuit are normal)
• Malfunction of torque converter (Poor operation, sticking)
- Engagement of TCC operation range (Operation of fail-safe function)
• Malfunction of TFT sensor (Short or open circuit)
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP

INSPECTION

ACTION

1
• With ignition switch at ON, does gear position indicator light indication correspond to selector lever position?
Yes
Go to next step.
No
Go to symptom troubleshooting No.27 "Gear position indicator light does not illuminate in M range", or No.28 "Gear position indicator light illuminates in D range or P, N, R position".
2
• Go to symptom troubleshooting No.12 "Lack/loss of power-acceleration/cruise".
• Does engine control system okay?
Yes
Go to next step.
No
Repair or replace any defective parts according to inspection results.
3
• Stop engine.
• Inspect shift solenoid A, B, or C.
• Are they okay?
Yes
Go to next step.
No
• Inspect for shift solenoid mechanical stuck.
- If shift solenoids okay, inspect for open or short circuit between TCM connector terminals 2W, 2T, 2X and pressure control solenoid connector terminals I, G, or F.
4
• Remove torque converter.
• Inspect torque converter.
(See ATX Workshop Manual.)
• Is torque converter okay?
Yes
• Overhaul control valve body and repair or replace any defective parts.
(See ATX Workshop Manual.)
- If problem remains, replace or overhaul transaxle and repair or replace any defective parts.
(See AUTOMATIC TRANSAXLE AND TRANSFER REMOVAL/INSTALLATION [JA5AX-EL].)
(See ATX Workshop Manual.)
No
Replace torque converter.
5
• Verify test results.
- If okay, return to diagnostic index to service any additional symptoms.
- If malfunction remains, inspect related Service Informations and perform repair or diagnosis.
• If vehicle repaired, troubleshooting completed.
• If vehicle not repaired or additional diagnostic information not available, replace TCM.