Mazda 6 2002, Workshop Manual

Page: 533 / 1248

K–122
TROUBLESHOOTING
NO.9 ABNORMAL SHIFTING
A6E568001030W13
Diagnostic procedure
End Of Sie
NO.10 FREQUENT SHIFTING
A6E568001030W14
End Of Sie
NO.11 SHIFT POINT IS HIGH OR LOW
A6E568001030W15
End Of Sie
9 Abnormal shifting
DESCRIPTION
•
Shift incorrectly (incorrect shift pattern).
POSSIBLE
CAUSE
•
There is a malfunction in the signal circuit which controls shifting (TP sensor, input/turbine speed
sensor, vehicle speed sensor), the control valve is stuck, the accumulator (forward or servo apply) is
stuck, or the clutch circuit is stuck.
1. Clutch slipped, burned
•
Line pressure low
•
Control valve body malfunction
•
Shift solenoid D malfunction
•
Shift solenoid E malfunction
•
Shift solenoid A malfunction
•
Shift solenoid B malfunction
•
Shift solenoid C malfunction
•
Body GND malfunction
•
Accelerator cable misadjustment
2. Signal malfunction
•
Vehicle speed sensor malfunction
•
Sensor GND malfunction
•
TP sensor malfunction or mis-adjustment
•
Input/turbine speed sensor malfunction
3. TR switch malfunction
•
Selector lever adjustment incorrect
•
TR sensor adjustment incorrect
Note
•
Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP INSPECTION ACTION
1 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.
2 Check the value at the following PIDs using the
WDS or equivalent. (See 3940 PCM
INSPECTION.)
•
TP
•
TSS
•
VSS
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.
10 Frequent shifting
DESCRIPTION
•
Downshifting occurs immediately even when accelerator pedal is depressed slightly in D, S, L ranges
except HOLD mode.
POSSIBLE
CAUSE
•
The circuit which is the cause is basically the same as No.9 “Abnormal shifting”. However, a malfunction
of the input signal to the TP sensor, input/turbine speed sensor, vehicle speed sensor (including the
sensor GND, sensor harness and connector), or clutch slippage (clutch stuck, low pressure in line) may
also be the cause.
11 Shift point is high or low
DESCRIPTION
•
Shift point considerably different from automatic shift diagram.
•
Shift delays when accelerating.
•
Shift occurs quickly when accelerating and engine speed does not increase.
POSSIBLE
CAUSE
•
If the transaxle does not shift abnormally, there is a malfunction of the input signal to the TP sensor,
input/turbine speed sensor, or vehicle speed sensor (including sensor GND).
•
If the engine speed is high or low, regardless normal shifting, inspect the tachometer.
•
Verify that the output signal of the TP sensor changes linearly.