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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 engine circuit. 1. Clutch slipped, burned • 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 • Poor connection of connector • The electronic parts of output and input system have malfunction 4. Insufficient starting torque (Suspected when in-gear condition, shift control and engine circuit are normal) • The torque converter has 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 troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • With ignition switch at ON, does HOLD indicator light indication correspond to HOLD switch operation? | Yes | Go to next step.
No | Go to No.26 "HOLD INDICATOR LIGHT DOES NOT ILLUMINATE WHEN HOLD SWITCH IS TURNED ON", No.27 "HOLD INDICATOR LIGHT ILLUMINATES WHEN HOLD SWITCH IS NOT TURNED ON."
2 | • Go to No.12 "LACK/LOSS OF POWER-ACCELERATION/CRUISE". (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [WITHOUT WU-TWC].) (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [WITH WU-TWC].) • Is CIS system normal? | Yes | Go to next step.
No | Repair or replace any defective parts.
3 | • Disconnect solenoid connector. • Does vehicle operate as follows? D, S ranges: 3GR (fixed) L range: 1GR (fixed) R position: Reverse | Yes | Go to next step.
No | Overhaul control valve body and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].) If problem remains, overhaul transaxle and repair or replace any defective parts.
4 | • Drive vehicle in D, S, and L ranges except HOLD mode. • Does vehicle start from stop in first gear? | Yes | Go to next step.
No | Check the value at the following PIDs using the WDS or equivalent. (See PCM INSPECTION [WITHOUT WU-TWC].) (See PCM INSPECTION [WITH WU-TWC].) • TP • VSS • TSS • TR Repair or replace any defective parts.
5 | • Check the value at the following PIDs using the WDS or equivalent. (See PCM INSPECTION [WITHOUT WU-TWC].) (See PCM INSPECTION [WITH WU-TWC].) - SSA/SS1 - SSB/SS2 - SSC/SS3 • Are PID values normal? | Yes | Go to next step.
No | Check the value at the following PIDs using the WDS or equivalent. (See PCM INSPECTION [WITHOUT WU-TWC].) (See PCM INSPECTION [WITH WU-TWC].) • TP • VSS • TSS Repair or replace any defective parts.
6 | • Perform the stall test. (See Stall Test.) • Is stall speed normal? | Yes | Reverify symptoms of malfunction.
No | Overhaul transaxle and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].)
7 | • Verify test results. - If normal, return to diagnostic index to service any additional symptoms. - If malfunction remains, inspect related Service Information and perform repair or diagnosis. • If vehicle repaired, troubleshooting completed. • If vehicle not repaired or additional diagnostic information not available, replace PCM.