NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE [FN4A-EL]

id050301802200

17

Excessive shift shock from N to D or N to R position/range

DESCRIPTION

•  Strong shock felt when shifting from N to D or N to R position/range.

POSSIBLE CAUSE

•  Shift shock may worsen when the fail-safe is operating. If no DTC is output, the shift shock may worsen due to poor operation of the control valve body or sticking of the clutch.

1.  Clutch burned (N→ D: Forward clutch, N→ R: Reverse clutch or low and reverse brake)

•  Line pressure low, high

•  Accelerator pedal position sensor malfunction

•  Vehicle speed sensor malfunction

•  Input/turbine speed sensor malfunction

•  Shift solenoid B malfunction

•  Shift solenoid D malfunction

•  Shift solenoid A malfunction

•  Shift solenoid C malfunction

•  Pressure control solenoid malfunction

•  Control valve body malfunction

•  Sensor GND malfunction

•  Body GND malfunction

2.  Poor hydraulic operation (Malfunction in range change)

•  Forward accumulator malfunction

•  Servo apply accumulator malfunction

3.  Idle speed high

4.  Poor tightening torque of engine mount, exhaust mount

5.  Poor operation of mechanical pressure

•  Selector lever position disparity

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	Does shift shock occur only when engine cold?	Yes	Go to next step.
1	Does shift shock occur only when engine cold?	No	Go to Step 3.
2	Disconnect PCM connector. Is resistance between GND terminal at PCM connector and body GND less than 5.0 ohms?	Yes	Check the value at the following PIDs using the M-MDS. (See PCM INSPECTION [MZR 1.3, MZR 1.5].) • APP • TFT • TFTV Repair or replace any defective parts.
2		No	Repair open GND circuit. Reconnect PCM connector.
3	Perform the stall test. (See MECHANICAL SYSTEM TEST [FN4A-EL].) Is stall speed okay?	Yes	Go to next step.
3		No	Go to Step 5.
4	Check TR PID value. Is PID value okay? (See PCM INSPECTION [MZR 1.3, MZR 1.5].)	Yes	Overhaul control valve body and repair or replace any defective parts. If problem remains, overhaul transaxle and repair or replace any defective parts.
4		No	Repair or replace any defective parts.
5	Check the value at the following PID using the M-MDS. (See PCM INSPECTION [MZR 1.3, MZR 1.5].) • APP Is PID value okay?	Yes	Go to next step.
5		No	Repair or replace any defective parts.
6	Disconnect PCM connector. Is resistance between GND terminal at PCM connector and body GND less than 5.0 ohms?	Yes	Go to next step.
6		No	Repair open GND circuit. Reconnect PCM connector.
7	Check LPS PID value. Is LPS PID value okay? (See PCM INSPECTION [MZR 1.3, MZR 1.5].)	Yes	Overhaul control valve body and repair or replace any defective parts. If problem remains, overhaul transaxle and repair or replace any defective parts.
7		No	Repair or replace any defective parts.
8	• 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.