Mazda Mazda6 Workshop Manual Supplement page 608

STEP
• Verify test results.
5
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, inspect related Service Informations and perform repair or diagnosis.
— If vehicle repaired, troubleshooting completed.
— If vehicle not repaired or additional diagnostic information not available, replace TCM.
End Of Sie
NO.9 ABNORMAL SHIFTING
9 Abnormal shifting
• Shift incorrectly (incorrect shift pattern).
DESCRIPTION
• There is a malfunction in signal circuit which controls shifting (Throttle position signal, input/turbine
speed sensor, VSS), control valve is stuck, or clutch circuit is stuck.
— Clutch slipped, burned
• Line pressure low
• Incorrect throttle position signal
• Malfunction of VSS
• Malfunction of input/turbine speed sensor
• Malfunction of sensor ground
• Malfunction of shift solenoid A, B, or C
POSSIBLE
• Malfunction of TCC solenoid valve
CAUSE
• Malfunction of body ground
• Misadjustment of accelerator cable
• Malfunction of control valve body
• Malfunction or misadjustment of TR switch
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
Diagnostic procedure
STEP
• Inspect continuity between TCM connector
1
terminals C and Y and transaxle case.
• Is there continuity?
• Stop engine.
2
• Inspect shift solenoid A, B, or C circuit.
• Are they okay?
• Verify test results.
3
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, inspect related Service Informations and perform repair or diagnosis.
— If vehicle repaired, troubleshooting completed.
— If vehicle not repaired or additional diagnostic information not available, replace TCM.
End Of Sie
NO.10 FREQUENT SHIFTING
10 Frequent shifting
• Downshifting occurs immediately even when accelerator pedal depressed slightly in D range.
DESCRIPTION
• The circuit which is the cause is basically the same as for No.9 "Abnormal shifting". However, a
malfunction of input signal to TP sensor, input/turbine speed sensor, VSS (including the sensor ground,
sensor harness and connector), or clutch slippage (clutch stuck, low pressure in line) may also be the
cause.
POSSIBLE
CAUSE
Note
• Before following troubleshooting steps, make sure that the Automatic Transaxle On-Board
Diagnostic and Automatic Transaxle Basic Inspection are conducted.
End Of Sie
TROUBLESHOOTING
INSPECTION
INSPECTION
Yes Go to next step.
No Repair or replace ground circuit.
Yes Inspect TCM connector terminal for bend, damage,
corrosion or poor contact.
• Inspect connection of shift solenoid A, B, or C terminal
No
on ATX for bend, damage, corrosion or looseness.
• Inspect for shift solenoid mechanical stuck.
(See K2–88 SOLENOID VALVE
— If shift solenoids okay, inspect for open or short circuit
between TCM connector terminals 2W, 2T, 2X and
coupler component terminals I, G, or F.
ACTION
A6E578001030212
ACTION
INSPECTION.)
A6E578001030213
K2–193
K2