Dtc P0740 - Mazda Mazda6 Workshop Manual Supplement

STEP
12 VERIFY TROUBLESHOOTING OF DTC P0720
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory using WDS or
equivalent.
• Drive vehicle with vehicle speed 40 km/h {25
mph} or above for 2 second or more
• Is same DTC present?
13 VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
(See K2–124 AFTER REPAIR
• Is there any DTC present?
End Of Sie

DTC P0740

DTC P0740 TCC system malfunction
• RPM difference between crankshaft (engine speed signal) and reverse clutch drum (input/turbine speed
sensor signal) exceeds the pre-programmed value.
Diagnostic support note:
• This is continuous monitor (CCM).
DETECTION
• MIL illuminates if TCM detects the above malfunction conditions in two consecutive drive cycles.
CONDITION
• PENDING CODE is available.
• FREEZE FRAME DATA is available.
• AT warning light does not indication.
• DTC is stored in TCM memory.
• ATF level low.
• Deteriorated ATF.
• TCC solenoid valve and pressure control solenoid stuck.
• Line pressure low.
POSSIBLE
• Oil pump malfunction.
CAUSE
• Control valve stuck
• Torque convert clutch malfunction
• TCM malfunction.
Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME PID DATA been
recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins and/or on-
line repair information availability.
• Is any related repair information available?
3 CHECK ATF CONDITION
• Turn ignition key to OFF.
• Check ATF condition.
— Clear red: Normal
— Milky: Water mixed in fluid
— Reddish brown: Deteriorated ATF
• Is it okay?
(See K2–78 Automatic Transaxle Fluid (ATF)
Condition Inspection.)
4 CHECK ATF LEVEL
• Start engine.
• Warm up ATX.
• Is ATF level within specification?
(See K2–79 Automatic Transaxle Fluid (ATF)
Level Inspection.)
K2–142
ON-BOARD DIAGNOSTIC
INSPECTION
PROCEDURE.)
INSPECTION
Yes Replace TCM, then go to next step.
(See K2–96 TCM REMOVAL/INSTALLATION.)
No Go to next step.
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
Yes Go to next step.
No Record FREEZE FRAME PID DATA on repair order, then
go to next step.
Yes Perform repair or diagnosis according to available repair
information.
• If vehicle is not repaired, go to next step.
No Go to next step.
Yes Go to next step.
No If ATF color milky or reddish brown, replace ATF, then go to
Step 5.
(See K2–80 AUTOMATIC TRANSAXLE FLUID (ATF)
REPLACEMENT.)
Yes Go to next step.
No Adjust ATF level, then go to Step 9.
(See K2–79 Automatic Transaxle Fluid (ATF) Level
Inspection.)
ACTION
A6E577018901212
ACTION