Mazda 6 2002, Workshop Manual

Page: 535 / 1248

K–124
TROUBLESHOOTING
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NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING
A6E568001030W18
Diagnostic procedure
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NO.15 ENGINE FLARES UP OR SLIPS WHEN ACCELERATING VEHICLE
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14 Engine flares up or slips when upshifting or downshifting
DESCRIPTION
•
When accelerator pedal is depressed for driveway, engine speed increases but vehicle speed increases
slowly.
•
When accelerator pedal is depressed while driving, engine speed increases but vehicle does not.
POSSIBLE
CAUSE
•
There is clutch slip because clutch is stuck or line pressure is low.
1. Clutch stuck, slippage (forward clutch, 3–4 clutch, 2–4 brake band, one-way clutch)
•
Line pressure low
•
Shift solenoid D malfunction
•
Shift solenoid E malfunction
•
Shift solenoid A malfunction
•
Shift solenoid B malfunction
•
Shift solenoid C malfunction
•
Pressure control solenoid malfunction
•
Body GND malfunction
•
Accelerator cable misadjustment
•
Control valve body malfunction
2. Signal malfunction
•
Vehicle speed sensor malfunction
•
Sensor GND malfunction
•
TP sensor malfunction or mis-adjustment
•
Input/turbine speed sensor malfunction
3. Poor operation of mechanical pressure
•
Selector lever position disparity
•
TR switch 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 Is shift point okay? Yes Go to next step.
No Go to No.9 "ABNORMAL SHIFTING"
2 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.
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
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.
15 Engine flares up or slips when accelerating vehicle
DESCRIPTION
•
Engine flares up when accelerator pedal is depressed for upshifting.
•
Engine flares up suddenly when accelerator pedal is depressed for downshifting.
POSSIBLE
CAUSE
•
The malfunction is basically the same as for No.14 "Engine flares up or slips when upshifting or
downshifting". If conditions for No.14 worsen, the malfunction will develop to No.15.