Mazda 6. Manual — part 221
TROUBLESHOOTING
K–125
K
NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION
A6E568001030W20
Diagnostic procedure
End Of Sie
16
Judder upon torque converter clutch (TCC) operation
DESCRIPTION
• Vehicle jolts when TCC is engaged.
POSSIBLE
CAUSE
• Poor TCC engagement due to either slippage because the TCC is stuck or the line pressure is low
Caution
• If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which
may have mixed in with the ATF.
1. Torque converter clutch piston slipped, burned
• Line pressure high
• Shift solenoid A malfunction
• Control valve body malfunction
• Body GND malfunction
• Pressure control solenoid malfunction
2. Signal malfunction
• Vehicle speed sensor malfunction
• Sensor GND malfunction
• TFT sensor malfunction
• TP sensor malfunction or mis-adjustment
• Input/turbine speed sensor malfunction
3. Torque converter malfunction
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP
INSPECTION
ACTION
1
Check the value at the following PIDs using the
WDS or equivalent. (See
• TSS
Are PID values okay?
Yes
Go to next step.
No
Repair or replace any defective parts.
2
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.
3
Check resistance between shift solenoid A
control circuit at PCM connector and control
valve body connector. Check resistance
between shift solenoid A circuit at PCM
connector and control valve body connector. Are
the resistance less than 5.0 ohms?
Yes
Go to next step.
No
Repair shift solenoid A circuit.
4
Inspect Shfit solenoid. (See
.) Is the solenoid valve
operating properly?
Yes
Go to next step.
No
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].)
5
Check LPS PID value.
Is LPS PID value okay?
(See
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
Replace PCM.
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
• TP
• TFT
• TFTV
Repair or replace any defective parts.
No
Repair open ground circuit. Reconnect PCM.
3
Perform the stall test. (See
.) 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
• 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
• 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
.)
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.
TROUBLESHOOTING
K–127
K
End Of Sie
NO.18 EXCESSIVE SHIFT SHOCK IS FELT WHEN UPSHIFTING AND DOWNSHIFTING
A6E568001030W22
Diagnostic procedure
End Of Sie
NO.19 EXCESSIVE SHIFT SHOCK ON TORQUE CONVERTER CLUTCH (TCC)
A6E568001030W23
End Of Sie
18
Excessive shift shock is felt when upshifting and downshifting
DESCRIPTION
• Excessive shift shock felt when depressing accelerator pedal to accelerate at upshifting. During
cruising, excessive shift shock is felt when depressing accelerator pedal at downshifting.
POSSIBLE
CAUSE
• Shift shock may worsen when fail-safe is operating. The shift shock has worsened if the TP sensor,
input/turbine speed sensor, or vehicle speed sensor signal malfunctions.
1. Clutch slipped, burned (Forward clutch, 2–4 brake band, 3–4 clutch)
• Line pressure low, high
• Shift solenoid D malfunction
• Shift solenoid E malfunction
• Shift solenoid A malfunction
• Shift solenoid B malfunction
• Shift solenoid C malfunction
• Pressure control solenoid malfunction
• Accelerator cable misadjustment
• Control valve body malfunction
• Body GND malfunction
2. Signal malfunction
• Transaxle temperature sensor malfunction
• Vehicle speed sensor malfunction
• Sensor GND malfunction
• TP sensor malfunction
• Input/turbine speed sensor malfunction
3. Poor hydraulic operation (Malfunction in range change)
• Pressure switch malfunction
• Forward accumulator malfunction
• Servo apply accumulator malfunction
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP
INSPECTION
ACTION
1
Perform the stall test. (See
.) Is
stall speed okay?
Yes
Go to next step.
No
Repair or replace any defective parts.
2
Check the value at the following PIDs using the
WDS or equivalent. (See
• TP V
Is PID value okay?
Yes
Go to next step.
No
Repair or replace any defective parts.
3
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.
4
Check LPS PID value.
Is LPS PID value okay?
(See
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.
19
Excessive shift shock on torque converter clutch (TCC)
DESCRIPTION
• Strong shock is felt when TCC engaged.
POSSIBLE
CAUSE
• The troubleshooting flow is the same as No.16 “Judder upon TCC operation”.
K–128
TROUBLESHOOTING
NO.20 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN ALL POSITIONS/RANGES
A6E568001030W24
Diagnostic procedure
End Of Sie
NO.21 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN D, S, L RANGES, OR IN R POSITION
A6E568001030W25
End Of Sie
20
Noise occurs at idle when vehicle is stopped in all positions/ranges
DESCRIPTION
• Transaxle noisy in all positions and ranges when vehicle is idling.
POSSIBLE
CAUSE
• The malfunction is in the oil pump which causes a high-pitched noise to be emitted from the transaxle at
idle.
Note
• If a noise is emitted during shifting only, the malfunction is in shift solenoid D, E or shift solenoid A, B,
C. If a noise is emitted during shifting at certain gears only or during deceleration only, it is gear
noise.
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP
INSPECTION
ACTION
1
Inspect engine condition.
Is any engine concern (i. e. rough idle)?
Yes
Go to appropriate symptom troubleshooting. (See Section
F.)
No
Go to next step.
2
Does noise stop when solenoid connector is
disconnected?
Yes
Go to next step.
No
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].)
3
Check the value at the following PIDs using the
WDS or equivalent. (See
• TP
• VSS
• TSS
Are PID values okay?
Yes
Go to next step.
No
Repair or replace any defective parts.
4
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.
5
Check LPS PID value.
Is LPS PID value okay?
(See
.)
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.
21
Noise occurs at idle when vehicle is stopped in D, S, L ranges, or in R position
DESCRIPTION
• Transaxle noisy in driving ranges when vehicle idling.
POSSIBLE
CAUSE
• Although the malfunction is basically the same as No.20 "Noise occurs at idle when vehicle is stopped
in all positions/ranges", other causes may be selector lever position disparity or TR switch position
disparity.
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