Mazda 6 2002 Workshop Manual page 500

NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE
17 Ecessive 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.
• 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
• TP 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
• Accelerator cable misadjustment
• Control valve body malfunction
POSSIBLE
CAUSE • Sensor GND malfunction
• Body GND malfunction
2. Poor hydraulic operation (Malfunction in range change)
• Forward accumlator malfunction
• Servo apply accumulator malfunction
• Pressure switch malfunction
3. Idle speed high
4. Poor tightening torque of engine mount, ehaust mount
5. Poor operation of mechanical pressure
• Selector lever position disparity
Note
• Before following troubleshooting steps, make sure that Automatic Transale On-Board Diagnostic
Diagnostic procedure
STEP
1 Does shift shock occur only when engine cold?
2 Disconnect PCM. Is resistance between ground
terminal at PCM connector and body ground
less than 5.0 ohms?
3 Perform the stall test. (See
stall speed okay?
4 Check the value at the following PIDs using the
WDS or equivalent. (See
INSPECTION.)
• TR
Is PID value okay?
5 Check the value at the following PID using the
WDS or equivalent. (See
INSPECTION.)
• TP
Is PID value okay?
6 Disconnect PCM. Is resistance between ground
terminal at PCM connector and body ground
less than 5.0 ohms?
7 Check LPS PID value.
Is LPS PID value okay?
(See F–45 PCM
K–126
TROUBLESHOOTING
and Automatic Transale Basic Inspection are conducted.
INSPECTION
K–7 Stall Test.) Is
F–45 PCM
F–45 PCM
INSPECTION.)
Yes Go to net step.
No Go to Step 3.
Yes Check the value at the following PIDs using the WDS or
equivalent. (See F–45 PCM
• TP
• TFT
• TFTV
Repair or replace any defective parts.
No Repair open ground circuit. Reconnect PCM.
Yes Go to net step.
No Go to Step 5.
Yes Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transale and
repair or replace any defective parts. (See ATX workshop
manual (FN4A-EL) [1623-10-98E].) (See ATX workshop
manual supplement (FN4A-EL) [1746-1*-02C].)
No Repair or replace any defective parts.
Yes Go to net step.
No Repair or replace any defective parts.
Yes Go to net step.
No Repair open ground circuit. Reconnect PCM.
Yes Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transale and
repair or replace any defective parts. (See ATX workshop
manual (FN4A-EL) [1623-10-98E].) (See ATX workshop
manual supplement (FN4A-EL) [1746-1*-02C].)
No Repair or replace any defective parts.
A6E568001030W21
ACTION
INSPECTION.)