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

id050301801100

6

Low maximum speed and poor acceleration

DESCRIPTION

•  Vehicle acceleration is poor at start.

•  Delayed acceleration when the 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, burnt

•  Line pressure low

•  Shift solenoid A malfunction

•  Shift solenoid B malfunction

•  Shift solenoid C malfunction

•  Shift solenoid D malfunction

•  Shift solenoid E malfunction

•  Pressure control solenoid malfunction

•  Control valve body malfunction

•  Body GND malfunction

2.  Signal malfunction

•  APP sensor malfunction

•  Input/turbine speed sensor malfunction

•  ABS wheel-speed sensor malfunction

•  Sensor GND 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)

•  TFT sensor malfunction (Short or open circuit)

6.  Transaxle fixed in M position

•  M position switch (built-in selector lever component) 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. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [PCM (FN4A-EL)].) (See BASIC INSPECTION [FN4A-EL].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Does the gear position indicator light indication correspond to the selector lever position with the ignition at the ON?	Yes	Go to the next step.
1		No	Perform the symptom troubleshooting “NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M POSITION” or “NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN P, R, N AND D POSITION”. (See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M POSITION [FN4A-EL].) (See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN P, R, N AND D POSITION [FN4A-EL].)
2	Perform the symptom troubleshooting “NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE”. (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZR 1.6].) 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 position: 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. If any problem remains: • Overhaul the transaxle and repair or replace any malfunctioning parts.
4	Drive the vehicle in D position. Does the vehicle start from stop in first gear?	Yes	Go to the next step.
4		No	Inspect the following PID values using the M-MDS: (See PCM INSPECTION [MZR 1.6].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) • APP • VSS • TSS • TR Repair or replace any malfunctioning parts.
5	Inspect the following PID values using the M-MDS: (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) • SSA/SS1 • SSB/SS2 • SSC/SS3 Are the PID values normal?	Yes	Go to the next step.
5		No	Inspect the following PID values using the M-MDS: (See PCM INSPECTION [MZR 1.6].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) • APP • VSS • TSS Repair or replace any malfunctioning parts.
6	Perform the stall test. (See MECHANICAL SYSTEM TEST [FN4A-EL].) Is the stall speed normal?	Yes	Reverify symptoms of malfunction.
6		No	Overhaul the transaxle and repair or replace any malfunctioning parts.
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. (See PCM REMOVAL/INSTALLATION [MZR 1.6].)