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

BME050301030210

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.

Diagnostic procedure

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.
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.
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.
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.
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.
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.
No | Overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)