NO.6 LOW MAXIMUM SPEED AND POOR ACCELERATION [SJ6A-EL]

id050307801100

6 | Low maximum speed and poor acceleration
DESCRIPTION | • Vehicle acceleration is poor at start. • Delayed acceleration when accelerator pedal is depressed while driving.
POSSIBLE CAUSE | • If the clutch is stuck or does not stay in 4GR, malfunction is in engine circuit. ― Clutch slippage, burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake, B2 brake, B3 brake, B4 brake) • Line pressure low • Line pressure control solenoid malfunction • Control valve body malfunction ― Transmission fixed in 4GR (Operation of fail-safe function) • Short or open circuit in wiring harness • Poor connection of connector • Malfunction of electronic parts of output and input system ― Insufficient starting torque (Suspected when in-gear, shift control and engine circuit are normal) • Torque converter malfunction (Poor operation, stuck) ― Engine output low Note • Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION [SJ6A-EL].)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • With the ignition switch at the ON position. • Does the gear position indicator light indication correspond to the selector lever position? | Yes | Go to the next step.
No | Perform the symptom troubleshooting “NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M RANGE”, or “NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R AND N POSITION”. (See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M RANGE [SJ6A-EL].) (See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R AND N POSITION [SJ6A-EL].)
2 | • Perform the symptom troubleshooting “NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE”. (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [L8, LF].) • Does the engine control system normal? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
3 | • Stop the engine. • Inspect line pressure control solenoid. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) • Is the line pressure control solenoid normal? | Yes | Go to the next step.
No | Inspect the coupler component. • If normal, replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
4 | • Remove the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION [SJ6A-EL].) • Inspect the torque converter. • Is the torque converter normal? | Yes | Inspect the ATF condition. • If a large amount of metal specks are found, overhaul the transmission and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].) (See Automatic Transmission Workshop Manual [SJ6A-EL].) • If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
No | Replace the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION [SJ6A-EL].)
5 | • Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If malfunction remains, inspect the related Service Information and perform repair or diagnosis. • If the vehicle is repaired, troubleshooting completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)