NO.6 LOW MAXIMUM SPEED AND POOR ACCELERATION

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NO.6 LOW MAXIMUM SPEED AND POOR ACCELERATION

B3E050319090W10

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. 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.
No | Go to No.27 "GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M RANGE" or No.28 "GEAR POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE OR P, N, R POSITIONS"
2 | Go to No.12 "LACK/LOSS OF POWER". (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [ZJ, Z6].) (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [LF].) 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 range: 3GR (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 range. 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 [ZJ, Z6].)
(See PCM INSPECTION [LF].)
• TP
• OSS
• 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 [ZJ, Z6].)
(See PCM INSPECTION [LF].)
• 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 [ZJ, Z6].)
(See PCM INSPECTION [LF].)
• TP
• OSS
• 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).)

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.