NO.6 LOW MAXIMUM SPEED AND POOR ACCELERATION [FN4A-EL]


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 3GR, the malfunction is in the engine circuit. 1. Clutch slippage, burnt • Line pressure low • Shift solenoid D malfunction • Shift solenoid E malfunction • Shift solenoid A malfunction • Shift solenoid B malfunction • Shift solenoid C malfunction • Pressure control solenoid malfunction • Body GND malfunction • Control valve body malfunction 2. Signal malfunction • Vehicle speed sensor malfunction • Sensor GND malfunction • TP sensor malfunction • Input/turbine speed sensor malfunction 3. Transaxle fixed in 3GR (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 4. Insufficient starting torque (Suspected when in-gear condition, shift control and engine circuit are normal) • Torque converter malfunction (Poor operation, stuck) 5. Engagement of TCC operation range (Operation of fail-safe function) • Transaxle fluid temperature sensor malfunction (Short or open circuit) 6. Transaxle fixed in HOLD mode • HOLD switch malfunction 7. TR switch adjustment incorrect Note • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.


STEP	INSPECTION		ACTION
1	With the ignition switch at the ON position, does the HOLD indicator light indication correspond to the HOLD switch operation?	Yes	Go to the next step.
1		No	Go to No.26 "HOLD INDICATOR LIGHT DOES NOT ILLUMINATE WHEN HOLD SWITCH IS TURNED TO ON.", No.27 "HOLD INDICATOR LIGHT ILLUMINATE WHEN HOLD SWITCH IS NOT TURNED TO ON."
2	Go to No.12 "LACK/LOSS OF POWER". (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [L3].) Is the CIS system normal?	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning parts.
3	Disconnect the solenoid connector. Does the vehicle operate as follows? D, S ranges: 3GR (fixed) L range: 1GR (fixed) R position: Reverse	Yes	Go to the next step.
3		No	Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)
4	Drive the vehicle in D, S, and L ranges except HOLD mode. Does the vehicle start from stop in first gear?	Yes	Go to the next step.
4		No	Inspect the value at the following PCM PIDs using the WDS or equivalent. (See PCM INSPECTION [L3].) • TP • VSS • TSS • TR Repair or replace any malfunctioning parts.
5	Inspect the value at the following PCM PIDs using the WDS or equivalent. (See PCM INSPECTION [L3].) • SSA/SS1 • SSB/SS2 • SSC/SS3 Are the PID values normal?	Yes	Go to the next step.
5		No	Inspect the value at the following PCM PIDs using the WDS or equivalent. (See PCM INSPECTION [L3].) • TP • VSS • TSS Repair or replace any malfunctioning parts.
6	Perform the stall test. (See Stall Test.) Is stall speed normal?	Yes	Reverify symptoms of malfunction.
6		No	Overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)