Mazda 6 2002 - Page 500

K126
TROUBLESHOOTING
NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE
A6E568001030W21
Diagnostic procedure
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
• 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
• 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, 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.
STEP INSPECTION ACTION
1 Does shift shock occur only when engine cold? Yes Go to next step.
No Go to Step 3.
2 Disconnect PCM. Is resistance between ground
terminal at PCM connector and body ground
less than 5.0 ohms?
Yes Check the value at the following PIDs using the WDS or
equivalent. (See F45 PCM INSPECTION.)
• TP
• TFT
• TFTV
Repair or replace any defective parts.
No Repair open ground circuit. Reconnect PCM.
3 Perform the stall test. (See K7 Stall Test.) Is
stall speed okay?
Yes Go to next step.
No Go to Step 5.
4 Check the value at the following PIDs using the
WDS or equivalent. (See F45 PCM
INSPECTION.)
• TR
Is PID value okay?
Yes Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transaxle 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.
5 Check the value at the following PID using the
WDS or equivalent. (See F45 PCM
INSPECTION.)
• TP
Is PID value okay?
Yes Go to next step.
No Repair or replace any defective parts.
6 Disconnect PCM. Is resistance between ground
terminal at PCM connector and body ground
less than 5.0 ohms?
Yes Go to next step.
No Repair open ground circuit. Reconnect PCM.
7 Check LPS PID value.
Is LPS PID value okay?
(See F45 PCM INSPECTION.)
Yes Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transaxle 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.