Mazda 6 2002 - Page 446

K72
ON-BOARD DIAGNOSTIC
Diagnostic procedure
POSSIBLE
CAUSE
• ATF level low
• Deteriorated ATF
• Shift solenoids A, B or C stuck
• Pressure control solenoid stuck
• Line pressure low
• 2-4 brake band slipping
• Forward clutch slipping
• Control valve stuck
• Oil pump
• 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.
No Go to next step.
2 CHECK ATF CONDITION
• Check ATF condition.
(See K12 AUTOMATIC TRANSAXLE FLUID
(ATF) INSPECTION.)
• Is it okay?
Yes Go to next step.
No Replace ATF, then go to Step 8.
3 CHECK ATF LEVEL
• Start engine.
• Warm up ATX.
• Is ATF level within specification?
(See K12 AUTOMATIC TRANSAXLE FLUID
(ATF) INSPECTION.)
Yes Go to next step.
No Adjust ATF level, then go to Step 8.
4 INSPECTION SHIFT SOLENOID VALVE A, B
AND C FOR CLICK SOUND
• Perform inspection of operation. (See K26
SOLENOID VALVE INSPECTION.)
• Verify the click sound of shift solenoid A, B,
and C when applying B+ to each transaxle
connector terminal.
• Was click heard from solenoids?
Yes Go to next step.
No Replace solenoid that you could not hear click sound, then
go to Step 8.
(See K28 SOLENOID VALVE REMOVAL/
INSTALLATION.)
5 INSPECT LINE PRESSURE
• Start engine.
• Measure line pressures.
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, then go to Step 8.
Any ranges: Replace control valve body, then go to Step 8.
(See K34 CONTROL VALVE BODY REMOVAL, K35
CONTROL VALVE BODY INSTALLATION.)
6 INSPECT STALL SPEED
• Measure stall speed in D range.
(See K7 Stall Test.)
Specification
2,0002,600 rpm
• Is stall speed within specification?
Yes Go to next step.
No Replace automatic transaxle, then go to Step8.
(See K29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION.)
7 INSPECT FREQUENCY OF INPUT/TURBINE
SPEED SENSOR WHEN DRIVING VEHICLE
• Turn ignition key to OFF.
• Connect WDS or equivalent.
• Start engine.
• Measure frequency of input/turbine speed
sensor while driving vehicle under the following
conditions:
 Vehicle speed: 40 km/h {24 mph} (VSS
PID)
 Drive in D range, 2nd gear
 Throttle opening angle: about 25% (TP PID)
• Was frequency of input/turbine speed sensor at
approx. 1,156 Hz?
Yes Go to next step.
No Replace control valve body, then go to next step.
(See K34 CONTROL VALVE BODY REMOVAL, K35
CONTROL VALVE BODY INSTALLATION.)
DTC P0732 Gear 2 incorrect (Incorrect Gear Ratio Detected)