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.
1		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.
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 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.
5		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.
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.