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

id0503a1801100

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

•  APP 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.  Transaxle fixed in 4GR (Operation of fail-safe function)

•  Forward clutch slippage

•  Vehicle speed sensor malfunction

•  Shift solenoid A malfunction (Stuck on)

•  Poor connection of connector

5.  Insufficient starting torque (Suspected when in‐gear condition, shift control and engine circuit are normal)

•  Torque converter malfunction (Poor operation, stuck)

6.  Engagement of TCC operation range (Operation of fail‐safe function)

•  Transaxle fluid temperature sensor malfunction (Short or open circuit)

7.  Transaxle fixed in M range

•  M range switch malfunction

8.  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.

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	Go to 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”
2	Go to No.12 “LACK/LOSS OF POWER-ACCELERATION/CRUISE”. (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE[ZJ, ZY, Z6].) (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE[LF, 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 range: 3GR (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 range. 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 M-MDS. (See PCM INSPECTION[ZJ, ZY, Z6].) (See PCM INSPECTION[LF, L3].) • TP • OSS • TSS • TR • APP1 • APP2 • TP1 • VSS Repair or replace any malfunctioning parts.
5	Inspect the value at the following PCM PIDs using the M-MDS. (See PCM INSPECTION[ZJ, ZY, Z6].) (See PCM INSPECTION[LF, 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 M-MDS. (See PCM INSPECTION[ZJ, ZY, Z6].) (See PCM INSPECTION[LF, L3].) • TP • OSS • TSS • APP1 • APP2 • TP1 • VSS Repair or replace any malfunctioning parts.
6	Perform the stall test. (See MECHANICAL SYSTEM TEST[FN4A-EL].) 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).)
7	• Verify the test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If the malfunction remains, inspect the related Service information and perform repair or diagnosis. • If the vehicle is repaired, troubleshooting is completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.