Mazda CX-7 2007 Workshop Manual page 914

ON-BOARD DIAGNOSTIC [AW6A-EL, AW6AX-EL]
DTC P0731[AW6A-EL, AW6AX-EL]
DTC P0731 Gear 1 incorrect (incorrect gear ratio detected)
• Incorrect gear ratio detected when following conditions are satisfied while driving:
Monitoring condition:
— ATF temperature 20 °C {68 °F} or more
— Driving in 1GR in D range
— Engine running
— Accelerator opening angle 10% or more
— Vehicle speed signal normal
DETECTION
CONDITION Diagnostic support note:
• This is a continuous monitor (CCM).
• The MIL illuminates if the TCM detects the above malfunction condition during the first drive cycle.
• A PENDING CODE is not available.
• FREEZE FRAME DATA is available.
• The AT warning light illuminates.
• The DTC is stored in the TCM memory.
• ATF level low
• Deteriorated ATF
• Shift solenoid D stuck
• Shift solenoid E stuck
• Shift solenoid F stuck
• Line pressure control solenoid stuck
POSSIBLE
• Line pressure low
CAUSE
• C1 clutch slipping
• One-way clutch slipping
• Control valve stuck
• Oil pump malfunction
• TCM malfunction
Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has the FREEZE FRAME DATA been
recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related Service Bulletins and/or on-line
repair information availability.
• Is any related repair information available?
3 INSPECT ATF CONDITION
• Inspect the ATF condition.
(See 05-17-10 AUTOMATIC TRANSAXLE
FLUID (ATF) INSPECTION[AW6A-EL,
AW6AX-EL].)
• Is it normal?
4 INSPECT ATF LEVEL
• Start the engine.
• Warm up the ATX.
• Is the ATF level within the specification?
(See 05-17-10 AUTOMATIC TRANSAXLE
FLUID (ATF) INSPECTION[AW6A-EL,
AW6AX-EL].)
5 INSPECT LINE PRESSURE
• Start the engine.
• Measure the line pressures.
(See 05-17-3 MECHANICAL SYSTEM
TEST[AW6A-EL, AW6AX-EL].)
• Are the line pressures within the
specifications?
6 INSPECT STALL SPEED
• Measure the stall speed in D range.
(See05-17-3 MECHANICAL SYSTEM
TEST[AW6A-EL, AW6AX-EL].)
• Is the stall speed within the specification?
05-02–26
INSPECTION
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order,
then go to the next step.
Yes Perform repair or diagnosis according to the available
repair information.
• If the vehicle is not repaired, go to the next step.
No Go to the next step.
Yes Go to the next step.
No Replace the transaxle, then go to Step 8.
Yes Go to the next step.
No Add ATF to the specified level, then go to Step 8.
Yes Go to the next step.
No All ranges: Replace the oil pump, then go to Step 8.
Any ranges: Replace the control valve body, then go to
Step 8.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
Yes Go to the next step.
No Replace the automatic transaxle, then go to Step 8.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
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