#
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". (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [L8, LF, L3].) • 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. (See SOLENOID VALVE INSPECTION [JA5AX-EL].) - 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.