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 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

•  Accelerator pedal position 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 have 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 HOLD mode

•  HOLD 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.

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.
1		No	Go to No.27 “HOLD INDICATOR LIGHT DOES NOT ILLUMINATE WHEN HOLD SWITCH IS TURNED ON.”. No.28 “HOLD INDICATOR LIGHT ILLUMINATES WHEN HOLD SWITCH IS NOT TURNED ON.”
2	Go to No.12 “Lack/loss of power”. (See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZR 1.3, MZR 1.5].) Does CIS system okay?	Yes	Go to next step.
2		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.
3		No	Overhaul control valve body and repair or replace any defective parts. 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.
4		No	Check the value at the following PIDs using the M-MDS. (See PCM INSPECTION [MZR 1.3, MZR 1.5].) • APP • VSS • TSS • TR Repair or replace any defective parts.
5	Check the value at the following PIDs using the M-MDS. (See PCM INSPECTION [MZR 1.3, MZR 1.5].) • SSA/SS1 • SSB/SS2 • SSC/SS3 Are PID values okay?	Yes	Go to next step.
5		No	Check the value at the following PIDs using the M-MDS. (See PCM INSPECTION [MZR 1.3, MZR 1.5].) • APP • VSS • TSS Repair or replace any defective parts.
6	Perform the stall test. (See MECHANICAL SYSTEM TEST [FN4A-EL].) Is stall speed okay?	Yes	Reverify symptoms of malfunction.
6		No	Overhaul transaxle and repair or replace any defective parts.
7	• Verify test results. ― If okay, return to diagnostic index to service any additional symptoms. ― If malfunction remains, inspect related Service informations and perform repair or diagnosis. • If vehicle not repaired, trouble shooting completed. • If vehicle not repaired or additional diagnostic information not available, replace PCM.