NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE [FS5A-EL]

id050308802200

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
•  CKP sensor malfunction
•  VSS 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 A 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
•  Oil pressure switch 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 the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FS5A-EL].) (See BASIC INSPECTION [FS5A-EL].)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Does the shift shock occur only when the engine is cold?
Yes
Go to the next step.
No
Go to Step 3.
2
Disconnect the TCM connector.
Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms?
Yes
Inspect the value at the following PCM and TCM PIDs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.8, MZR 2.0, MZR 2.5].)
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].)
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
PCM PIDs:
•  APP
•  RPM
TCM PIDs:
•  THOP
•  TFT
•  TFTV
Repair or replace any malfunctioning parts according to the inspection result.
(See PCM INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5].)
(See PCM INSPECTION [MZR 2.0 DISI].)
No
Repair or replace the wiring harness for a possible open circuit.
Reconnect the TCM connector.
3
Perform the stall test.
(See MECHANICAL SYSTEM TEST [FS5A-EL].)
Is the stall speed normal?
Yes
Go to the next step.
No
Go to Step 5.
4
Inspect the value at the following TCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  TR
Is the PID value normal?
Yes
Overhaul the control valve body and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
No
Repair or replace any malfunctioning parts according to the inspection result.
5
Inspect the value at the following TCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  THOP
Is the PID value normal?
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts according to the inspection result.
6
Disconnect the TCM connector.
Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit.
Reconnect the TCM connector.
7
Inspect the value at the following TCM PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].)
•  LPS
Is the PID value normal?
Yes
Overhaul the control valve body and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts.
(See Automatic Transaxle Workshop Manual FS5A-EL.)
No
Repair or replace any malfunctioning parts according to the inspection result.
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 TCM.