Mazda 2002 6 - Dtc P0742

K–78
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0742
A6E567001030W18
5 CHECK OPERATION OF EACH VALVE AND
EACH SPRING
• Turn ignition key to OFF.
• Remove control valve body.
• Disassemble control valve body.
• Is each valve operation okay and is return
spring okay?
(See K–34 CONTROL VALVE BODY REMOVAL,
K–35 CONTROL VALVE BODY INSTALLATION.)
(See ATX Workshop Manual FN4A-EL (9999-95-
FN4A-99).)
Yes Replace ATX, then go to next step
(See ATX Workshop Manual FN4A-EL (9999-95-FN4A-
99).)
No Repair or replace shift valve and return spring, then go to
next step.
(See K–34 CONTROL VALVE BODY REMOVAL, K–35
CONTROL VALVE BODY INSTALLATION.)
(See ATX Workshop Manual FN4A-EL (9999-95-FN4A-
99).)
6 VERIFY TROUBLESHOOTING OF DTC P0741
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory using WDS or
equivalent.
• Start engine.
• Warm up engine and ATX.
• Drive vehicle under following conditions for 5
seconds or more.
— ATF temperature: 20 °C {68 °F} or above
— Drive in D range, 4th gear (TCC operation)
— Vehicle speed (VSS PID): within 60—100
km/h {37—62 mph}
• Are any DTCs present?
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
7 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
(See K–52 AFTER REPAIR PROCEDURE.)
• Are any DTCs present?
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
STEP INSPECTION ACTION
DTC P0742 Torque converter clutch (TCC) stuck ON
DETECTION
CONDITION
• All of following conditions satisfied under each of following throttle conditions.
— 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 below 70 km/h {43 mph}.
— Torque converter clutch (TCC) no operation
— Difference between engine speed and turbine speed below 50 rpm
— DTC P0734 not output
• Throttle conditions.
— Throttle opening angle (TP PID) above 10.1% and 5 seconds or more have passed.
— Throttle opening angle (TP PID) within 3.1—10.1% and 3 seconds or more have passed.
— Throttle opening angle at closed throttle position and 5 seconds or more have passed.
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