Mazda Mazda6 Workshop Manual Supplement page 607

NO.8 DOES NOT SHIFT TO FIFTH GEAR (5GR)
8 Does not shift to fifth gear (5GR)
• Vehicle does not upshift from 4GR to 5GR even though vehicle speed increased.
DESCRIPTION
• Vehicle does not shift to 5GR even though accelerator pedal released in D range at 60 km/h {37 mph}.
• Basically, TCC does not operate when fail-safe is operating. Verify DTC at first. If TCC operates when
driving at high speeds only, malfunction (improper adjustment) is in the D range switch circuit or TR
switch circuit.
Note
— TCC piston slipped, burned
— Malfunction of TFT sensor
POSSIBLE
CAUSE
— Malfunction of TR switch
— Malfunction of TCC solenoid valve
— Malfunction of M range switch
— Malfunction of torque converter
— Malfunction of control valve body
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
Diagnostic procedure
STEP
• Turn ignition switch to ON.
1
• Does gear position indicator light indication
correspond to selector lever position?
• Drive vehicle in D range and inspect
2
following:
— 1–2 shift up and down
— 2–3 shift up and down
— 3–4 shift up and down
— 4–5 shift up and down
• Are all shift-up and shift-down possible?
• Stop engine.
3
• Inspect shift solenoid A, B, or C circuit.
• Are they okay?
• Remove torque converter.
4
• Inspect torque converter.
(See ATX Workshop.)
• Is torque converter okay?
K2–192
TROUBLESHOOTING
• If the TCC or piston is stuck, inspect them. In addition, inspect the oil cooler for foreign particles
which may have mixed in with the ATF.
• Line pressure low
• Incorrect throttle position signal
• Malfunction of ECT sensor
• Malfunction of VSS
• Malfunction of input/turbine speed sensor
• Malfunction of sensor ground
• Short or open circuit in wiring
• Poor connection of connector
• Malfunction of sensor
• Selector lever adjustment incorrect
• TR switch adjustment incorrect
• Short or open circuit in wiring
• Poor connection of connector
• Solenoid valve stuck
and Automatic Transaxle Basic Inspection are conducted.
INSPECTION
Yes Go to next step.
No Go to symptom troubleshooting No.27 "Gear position
indicator light does not illuminate in M range" or No.28
"Gear position indicator light illuminates in D range or P, N,
R positions".
Yes Go to next step.
No No shift at all:
• Go to symptom troubleshooting No.7 "No shifting".
Abnormal shift:
• Go to symptom troubleshooting No.9 "Abnormal
shifting".
Yes Go to next step.
• Inspect for shift solenoid mechanical stuck.
No
(See K2–88 SOLENOID VALVE
• Overhaul control valve body and repair or replace any
Yes
defective parts.
(See ATX Workshop Manual.)
— If problem remains, replace or overhaul transaxle and
repair or replace any defective parts.
(See K2–99 AUTOMATIC TRANSAXLE AND
TRANSFER
(See ATX Workshop Manual.)
No Replace torque converter.
ACTION
INSPECTION.)
REMOVAL/INSTALLATION.)
A6E578001030211