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.
1		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.
2		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.
3		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].)
4		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].)