Mazda 2002 6 - Dtc P0741

ON-BOARD DIAGNOSTIC
K–77
K
DTC P0741
A6E567001030W17
Diagnostic procedure
DTC P0741 Torque converter clutch (TCC) stuck OFF
DETECTION
CONDITION
• When all conditions below satisfied.
— ATF temperature 20 °C {68 °F} or above.
— Driving in 4GR at D range.
— Engine run.
— Turbine speed within 225—4,988 rpm.
— Vehicle speed within 60—100 km/h {37—62 mph}.
— TCC operation
— Shift solenoid A duty value exceeds 99%
— Power or normal mode
— Difference between engine speed and turbine speed more than 100 rpm
— Any of the following not generated: DTC P0500, P0706, P0707, P0708, P0712, P0713, P0715, P0751,
P0752, P0753, P0756, P0757, P0758, P0761, P0762, P0763, P0766, P0767, P0768, P0771, P0772,
P0773.
Diagnostic support note:
• This is a continuous monitor (CCM).
• MIL does not illuminate if PCM detects the above malfunction conditions during first drive cycle.
• PENDING CODE is not available.
• FREEZE FRAME DATA is not available.
• HOLD indicator light flashes.
• DTC is stored in the PCM memory.
POSSIBLE
CAUSE
• ATF level low
• Deteriorated ATF
• Shift solenoids A, B, C, D, E, and pressure control solenoid stuck
• Line pressure low
• 2-4 brake band slipping
• 3-4 clutch slipping
• Control valve stuck.
• PCM malfunction
STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins availability.
• Is any related repair information available?
Yes Perform repair or diagnosis according to available repair
information.
• If vehicle is not repaired, go to next step.
No Go to next step.
2 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 K–12 Automatic Transaxle Fluid (ATF)
Condition Inspection.)
Yes Go to next step.
No If ATF color milky or reddish brown, replace ATF, then go to
Step 4.
(See K–13 AUTOMATIC TRANSAXLE FLUID (ATF)
REPLACEMENT.)
3 CHECK ATF LEVEL
• Start engine.
• Warm up ATX.
• Is ATF level within specification?
(See K–12 Automatic Transaxle Fluid (ATF) Level
Inspection.)
Yes Go to next step.
No Adjust ATF level, then go to Step 6.
(See K–12 Automatic Transaxle Fluid (ATF) Level
Inspection.)
4 INSPECT LINE PRESSURE
• Start engine.
• Measure line pressure.
Specification
Idle: 330—470 kPa {3.4—4.7 kgf/cm
2
, 49—66
psi}
Stall: 1,160—1,320 kPa {11.9—13.4 kgf/cm
2
,
170—190 psi}
• Is line pressure within specification?
(See K–6 Line Pressure Test.)
Yes Go to next step.
No • All ranges: Replace oil pump or control valve body, then
go to Step 6.
• Any ranges: Replace ATX, then go to Step 6.
(See K–29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION.)
(See ATX Workshop Manual FN4A-EL (9999-95-FN4A-
99).)