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 is felt when shifting from N to D or N to R position/range at idle.
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 burnt (N→D: Forward clutch, N→R: Reverse clutch or low and reverse brake)
•  Line pressure low, high
•  APP sensor malfunction
•  Input/turbine speed sensor malfunction
•  VSS malfunction
•  Shift solenoid A malfunction
•  Shift solenoid B malfunction
•  Shift solenoid C malfunction
•  Shift solenoid D 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 cable 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 [FN4A-EL].) (See BASIC INSPECTION [FN4A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Does the shift shock occur only when the engine cold?
Yes
Go to the next step.
No
Go to Step 3.
2
Disconnect the PCM connector.
Measure the resistance between ground terminal at the PCM connector and body ground.
Is the resistance less than 5.0 ohms?
Yes
Inspect the following PID values using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
•  APP
•  TFT
•  TFTV
Repair or replace any malfunctioning parts.
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
No
Repair or replace the wiring harness for a possible open circuit.
3
Perform the stall test.
(See MECHANICAL SYSTEM TEST [FN4A-EL].)
Is the stall speed normal?
Yes
Go to the next step.
No
Go to Step 5.
4
Inspect the TR PID value using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
Is the PID value normal?
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
Yes
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.
No
Repair or replace any malfunctioning parts.
5
Inspect the APP PID value using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
Is the PID value normal?
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts.
6
Disconnect the PCM connector.
Measure the resistance between ground terminal at the PCM connector and body ground.
Is the resistance less than 5.0 ohms?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit.
7
Inspect the LPS PID value using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.5, MZR 1.6].)
Is the PID value normal?
(See PCM INSPECTION [MZR 1.5, MZR 1.6].)
Yes
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.
No
Repair or replace any malfunctioning parts.
8
•  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 1.5, MZR 1.6].)