2002 MAZDA 6 torque

K2–142
ON-BOARD DIAGNOSTIC
End Of SieDTC P0740A6E577018901212
Diagnostic procedure
12VERIFY 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?Yes Replace TCM, then go to next step.
(See K2–96 TCM REMOVAL/INSTALLATION.)
No Go to next step.
13VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See K2–124 AFTER REPAIR PROCEDURE.)
•Is there any DTC present?Yes Go to applicable DTC inspection.
No Troubleshooting completed. STEP INSPECTION ACTION
DTC P0740 TCC system malfunction
DETECTION
CONDITION•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).
•MIL illuminates if TCM detects the above malfunction conditions in two consecutive drive cycles.
•PENDING CODE is available.
•FREEZE FRAME DATA is available.
•AT warning light does not indication.
•DTC is stored in TCM memory.
POSSIBLE
CAUSE•ATF level low.
•Deteriorated ATF.
•TCC solenoid valve and pressure control solenoid stuck.
•Line pressure low.
•Oil pump malfunction.
•Control valve stuck
•Torque convert clutch malfunction
•TCM malfunction.
STEP INSPECTION ACTION
1VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
•Has FREEZE FRAME PID DATA been
recorded?Yes Go to next step.
No Record FREEZE FRAME PID DATA on repair order, then
go to next step.
2VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Bulletins and/or on-
line repair information 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.
3CHECK 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.)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.)
4CHECK ATF LEVEL
•Start engine.
•Warm up ATX.
•Is ATF level within specification?
(See K2–79 Automatic Transaxle Fluid (ATF)
Level Inspection.)Yes Go to next step.
No Adjust ATF level, then go to Step 9.
(See K2–79 Automatic Transaxle Fluid (ATF) Level
Inspection.)

ON-BOARD DIAGNOSTIC
K2–143
K2
End Of Sie
5INSPECT LINE PRESSURE
•Start engine.
•Measure line pressure.
Specification
—D range, M (2GR) range
Idle: 290—490 kPa {3.0—4.9 kgf/cm
2, 43—69
psi}
Stall: 1,550—1,750 kPa {15.8—17.8 kgf/cm
2,
225—254 psi}
—M (1GR) range, R position
Idle:550—750 kPa {5.6—7.6 kgf/cm
2, 80—
109 psi}
Stall: 1,550—1,750 kPa {15.8—17.8 kgf/cm
2,
225—254 psi}
•Is line pressure within specification?
(See K2–72 Line Pressure Test.)Yes Go to next step.
No All ranges: Replace or overhaul oil pump or control valve
body, then go to Step 10.
Any ranges: Replace or overhaul automatic transaxle, then
go to Step 10.
(See K2–99 AUTOMATIC TRANSAXLE AND TRANSFER
REMOVAL/INSTALLATION.)
6CLICK TEST OF SOLENOID VALVES
•Turn ignition key to OFF.
•Disconnect terminal component No.1(12-pin).
•Apply battery voltage to terminal component
No.1 (12-pin) terminals (transaxle case side).
—TCC solenoid vale: B
—Pressure control solenoid: D
•Verify the click sounds of TCC solenoid valve
and pressure control solenoid.
•Are there click sounds?Yes Go to next step.
No Replace TCC solenoid valve or pressure control solenoid,
then go to Step 10.
(See K2–105 CONTROL VALVE BODY REMOVAL/
INSTALLATION.)
7INSPECT DIFFERENCE BETWEEN ENGINE
SPEED AND TURBINE SPEED
•Inspect difference between engine speed and
turbine speed during TCC operation in 5GR
•Drive vehicle under following condition
—TR switch position: D range
—Gear position: 5GR
—TCC solenoid valve: ON
•Is difference between engine speed (RPM PID)
and turbine speed okay?
Difference
Below 99 rpmYes Go to Step
No Go to next step.
8INSPECT OPERATION OF EACH VALVE AND
EACH SPRING
•Remove control valve body.
•Disassemble control valve body.
•Is each valve operation okay and is return
spring okay?Yes Replace torque converter, then go to next step.
No Replace control valve body, then go to next step.
(See K2–105 CONTROL VALVE BODY REMOVAL/
INSTALLATION.)
9VERIFY TROUBLESHOOTING OF DTC P0740
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from memory using WDS or
equivalent.
•Start engine.
•Warm up ATX.
•Drive vehicle under following condition for 10
seconds or more.
—Vehicle speed (VSS PID): Within 10—87
km/h {6—54 mph}
—Gear position: 5GR
—TR switch position: D range
—TCC solenoid valve: ON
•Is there pending code present?Yes Replace TCM, then go to next step.
(See K2–96 TCM REMOVAL/INSTALLATION.)
No Go to next step.
10VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See K2–124 AFTER REPAIR PROCEDURE.)
•Is there any DTC present?Yes Go to applicable DTC inspection.
No Troubleshooting completed. STEP INSPECTION ACTION

K2–144
ON-BOARD DIAGNOSTIC
DTC P0743A6E577018901213
DTC P0743 Torque converter clutch (TCC) solenoid valve circuit malfunction (open/short)
DETECTION
CONDITION•Open or short in TCC solenoid signal system (while TCM monitors solenoid output voltage, the voltage that
differs from the ON/OFF signal output by CPU in TCM is detected).
Diagnostic support note:
•This is continuous monitor (CCM).
•MIL illuminates if TCM detects the above malfunction condition during first drive cycle.
•PENDING CODE is not available.
•FREEZE FRAME DATA is available.
•AT warning light does not indication.
•DTC is stored in TCM memory.
POSSIBLE
CAUSE•Open circuit between TCC solenoid valve terminal A and TCM terminal 2S
•Short to ground between TCC solenoid valve terminal A and TCM terminal 2S
•Short to power between TCC solenoid valve terminal A and TCM terminal 2S
•TCC solenoid valve malfunction
•Damage connector between TCC solenoid valve and TCM
•TCM malfunction
2PTCM
HARNESS SIDE CONNECTORTERMINAL COMPONENT
NO.1(12-PIN)
HARNESS SIDE CONNECTOR
COUPLER COMPONENT
(10-PIN)
PART SIDE CONNECTORTCC SOLENOID VALVE
HARNESS SIDE CONNECTORAT X
CPU
CPU2S
2PB
JA C
A
B TCM
TCC SOLENOID VALVE

TROUBLESHOOTING
K2–183
K2
AUTOMATIC TRANSAXLE SYMPTOM TROUBLESHOOTINGA6E578001030203Diagnostic Index
•Use the chart below to verify the symptoms of the trouble in order to diagnose the appropriate area.
No. TROUBLESHOOTING ITEM DESCRIPTION PAGE
1•Vehicle does not move in D range,
or in R position•Vehicle does not move when accelerator
pedal depressed.(See K2–188 NO.1 VEHICLE
DOES NOT MOVE IN D
RANGE, OR IN R POSITION.)
2•Vehicle moves in N position•Vehicle creeps in N position.
•Vehicle creeps if brake pedal not
depressed in N position.(See K2–188 NO.2 VEHICLE
MOVES IN N POSITION.)
3•Vehicle moves in P position, or
parking gear does not disengage
when P is disengaged•Vehicle rolls when on a downward slope
and tires do not lock in P position.
•Tires locked when P disengaged,
vehicle does not move in D range, and R
position when accelerator pedal
depressed, and engine remains in stall
condition.(See K2–189 NO.3 VEHICLE
MOVES IN P POSITION, OR
PARKING GEAR DOES NOT
DISENGAGE WHEN P IS
DISENGAGED.)
4•Excessive creep•Vehicle accelerates in D range, and R
position without depressing accelerator
pedal.(See K2–189 NO.4
EXCESSIVE CREEP.)
5•No creep at all•Vehicle does not move in D range, or R
position when idling on flat paved road.(See K2–189 NO.5 NO CREEP
AT ALL.)
6•Low maximum speed and poor
acceleration•Vehicle acceleration poor at start.
•Delayed acceleration when accelerator
pedal depressed while driving.(See K2–190 NO.6 LOW
MAXIMUM SPEED AND
POOR ACCELERATION.)
7•No shifting•Single shift range only.
•Sometimes it shifts correctly.(See K2–191 NO.7 NO
SHIFTING.)
8•Does not shift to fifth gear (5GR)•Vehicle does not upshift from 4GR to
5GR even though vehicle speed
increased.
•Vehicle does not shift to 5GR even
though accelerator pedal released in D
range at 60 km/h {37 mph}.(See K2–192 NO.8 DOES NOT
SHIFT TO FIFTH GEAR
(5GR).)
9•Abnormal shifting•Shifts incorrectly (incorrect shift pattern). (See K2–193 NO.9
ABNORMAL SHIFTING.)
10•Frequent shifting•Downshifting occurs immediately even
when accelerator pedal depressed
slightly in D range.(See K2–193 NO.10
FREQUENT SHIFTING.)
11•Shift point is high or low•Shift point considerably different from
automatic shift diagram.
•Shift delays when accelerating.
•Shift occurs quickly when accelerating
and engine speed does not increase.(See K2–194 NO.11 SHIFT
POINT IS HIGH OR LOW.)
12•Torque converter clutch (TCC)
non-operation•TCC does not operate when vehicle
reaches TCC operation range.(See K2–194 NO.12 TORQUE
CONVERTER CLUTCH (TCC)
NON-OPERATION.)
13•No kickdown•Does not downshift when accelerator
pedal fully depressed within kickdown
range.(See K2–195 NO.13 NO
KICKDOWN.)
14•Engine flares up or slips when
upshifting or downshifting•When accelerator pedal depressed for
driveway, engine speed increases but
vehicle speed increase slowly.
•When accelerator pedal depressed while
driving, engine speed increases but
vehicle speed does not increase.(See K2–195 NO.14 ENGINE
FLARES UP OR SLIPS WHEN
UPSHIFTING OR
DOWNSHIFTING.)
15•Engine flares up or slips when
accelerating vehicle•Engine flares up when accelerator pedal
depressed for upshifting.
•Engine flares up suddenly when
accelerator pedal depressed for
downshifting.(See K2–196 NO.15 ENGINE
FLARES UP OR SLIPS WHEN
ACCELERATING VEHICLE.)
16•Judder upon torque converter
clutch (TCC) operation•Vehicle jolts when TCC engaged. (See K2–196 NO.16 JUDDER
UPON TORQUE
CONVERTER CLUTCH (TCC)
OPERATION.)

K2–184
TROUBLESHOOTING
17•Excessive shift shock from N to D
or N to R position/range•Strong shock felt when shifting from N to
D or N to R position/range at idle.(See K2–196 NO.17
EXCESSIVE SHIFT SHOCK
FROM N TO D OR N TO R
POSITION/RANGE.)
18•Excessive shift shock is given
when upshifting and downshifting•Excessive shift shock felt when
depressing accelerator pedal to
accelerate at upshifting.
•During cruising, excessive shift shock
felt when depressing accelerator pedal
at downshifting.(See K2–197 NO.18
EXCESSIVE SHIFT SHOCK IS
GIVEN WHEN UPSHIFTING
AND DOWNSHIFTING.)
19•Excessive shift shock on torque
converter clutch (TCC)•Strong shock felt when TCC engaged. (See K2–197 NO.19
EXCESSIVE SHIFT SHOCK
ON TORQUE CONVERTER
CLUTCH (TCC).)
20•Noise occurs at idle when vehicle
is stopped in all positions/ranges•Transaxle noisy in all positions and
ranges when vehicle idling.(See K2–198 NO.20 NOISE
OCCURS AT IDLE WHEN
VEHICLE IS STOPPED IN ALL
POSITIONS/RANGES.)
21•Noise occurs at idle when vehicle
is stopped in D range, or in R
position•Transaxle noisy in driving ranges when
vehicle idling.(See K2–198 NO.21 NOISE
OCCURS AT IDLE WHEN
VEHICLE IS STOPPED IN D
RANGE, OR IN R POSITION.)
22•No engine braking in 1GR position
of M range•Engine speed drops to idle but vehicle
coasts when accelerator pedal released
during cruising at medium to high
speeds.
•Engine speed drops to idle but vehicle
coasts when accelerator pedal released
when in M range (1GR) at low vehicle
speed.(See K2–198 NO.22 NO
ENGINE BRAKING IN 1GR
POSITION OF M RANGE.)
23•Transaxle overheats•Burnt smell emitted from transaxle.
•Smoke emitted from transaxle.(See K2–199 NO.23
TRANSAXLE OVERHEATS.)
24•Engine stalls when shifted to D
range, or in R position•Engine stalls when shifting from N or P
position to D range or R position at idle.(See K2–199 NO.24 ENGINE
STALLS WHEN SHIFTED TO
D RANGE, OR IN R
POSITION.)
25•Engine stalls when driving at slow
speeds or stopping•Engine stalls when brake pedal
depressed while driving at low speed or
stopping.(See K2–200 NO.25 ENGINE
STALLS WHEN DRIVING AT
SLOW SPEED OR
STOPPING.)
26•Starter does not work•Starter does not work even when P or N
position selected.(See K2–200 NO.26
STARTER DOES NOT
WORK.)
27•Gear position indicator light does
not illuminate in M range•Gear position indicator light in
instrument cluster does not illuminate in
M range and ignition switch at on.(See K2–200 NO.27 GEAR
POSITION INDICATOR LIGHT
DOES NOT ILLUMINATE IN M
RANGE.)
28•Gear position indicator light
illuminates in D range or P, N, R
positions•Gear position indicator light in
instrument cluster illuminates in D range
or P, N, R positions and ignition switch at
on.(See K2–201 NO.28 GEAR
POSITION INDICATOR LIGHT
ILLUMINATES IN D RANGE
OR IN P, N, R POSITIONS.)
29•Does not shift up in M range•Gear position indicator light in
instrument cluster illuminates but vehicle
does not upshift when selector lever is
pushed to “+” side.(See K2–201 NO.29 DOES
NOT SHIFT UP IN M RANGE.)
30•Does not shift down in M range•Gear position indicator light in
instrument cluster illuminates but vehicle
does not downshift when selector lever
is pushed to “-” side.(See K2–201 NO.30 DOES
NOT SHIFT DOWN IN M
RANGE.) No. TROUBLESHOOTING ITEM DESCRIPTION PAGE

TROUBLESHOOTING
K2–185
K2
Quick Diagnosis Chart
Vehicle dose not move in D range, or in R position X X
X
X
X
X
X
X
X
X
XX X
XX
XX
XX
XX
X X X
X
XX X
XX
X XXXXX
XX X
XX
XX X X
X
X
X XX
X
XX
X
X
XX
X
XXX
X
XXX
X
X X XX
X
XXXX XX
X
XX
X
X X
XX XX
X
X
X 1
Excessive creep 4
No creep at all 5
Low maximum speed and poor acceleration 6
No shifting 7
Does not shift to fifth gear (5GR) 8
Abnormal shifting 9
Frequent shifting 10
Shift point is high or low 11
Torque converter clutch (TCC) non-operation 12
No kickdown 13
Engine flares up or slips when upshifting or downshifting 14
Engine flares up or slip when accelerating vehicle 15
Judder upon torque converter clutch (TCC) operation 16
Excessive shift shock from N to D or N to R position/range 17
Excessive shift shock on torque converter clutch (TCC) 19
No engine braking in 1GR position of M range 22
Transaxle overheats 23
Engine stalls when shifted to D range, or in R position 24
Engine stalls when driving at slow speeds or stopping 25
Starter does not work 26Excessive shift shock is given when upshifting and
downshifting 18
Noise occurs at idle when vehicle is stopped in all
positions/ranges 20
Noise occurs at idle when vehicle is stopped in D
range, or in R position 21
Gear position indicator light illuminates in D range or P, N,
R positions 28Gear position indicator light does not illuminate in M range
Electrical system components
ATX outer parts 27
Does not shift up in M range
29
Does not shift down in M range
Symptom item
Cause of trouble
Selector lever is misadjisted
Not within line pressure specification
Idle speed is misadjusted
IG timing is misadjusted
TR switch is misadjusted
Open/short
Abnormal signal is inputed
Abnormal signal is inputed Signal is not inputed
Signal is not inputed
Abnormal signal is inputed Signal is not inputed
Abnormal signal is inputed Signal is not inputed
Abnormal signal is inputed Signal is not inputed
Abnormal signal is inputed Signal is not inputed
Abnormal signal is inputed
Abnormal signal is inputed Signal is not inputedCAN signal
CAN signal Engine speed signal
Vehicle speedometer sensor
Input/turbine speed sensor
Intermediate sensor
D range switch
M range switch
Up switch
Down switch
Throttle opening
30Vehicle moves in N position 2
Vehicle moves in P position, or parking gear does not
disengage when P is disengaged 3
X X X
X X X
X
X
A6E5780W001

K2–186
TROUBLESHOOTING
CAN signal
Vehicle dose not move in D range, or in R position
X
XXX X
X
X X
X
XX
X
X
X
X
X
XX
XX
XX
XXX
XX
XX
X
XXX X
XX X
XX X
XX X
XXX
XX
X
XX
X XX XX
X
XX
XX
X XX
X XXXX
XXXX
XXXXX XX XXX
X
X
XX
X
X
X
X
X
X
X
X
X
X X
X
X
X X
XXX
XX
XX X X
X 1
Excessive creep 4
No creep at all 5
Low maximum speed and poor acceleration 6
No shifting 7
Does not shift to fifth gear (5GR) 8
Abnormal shifting 9
Frequent shifting 10
Shift point is high or low 11
Torque converter clutch (TCC) non-operation 12
No kickdown 13
Engine flares up or slips when upshifting or downshifting 14
Engine flares up or slip when accelerating vehicle 15
Judder upon torque converter clutch (TCC) operation 16
Excessive shift shock from N to D or N to R position/range 17
Excessive shift shock on torque converter clutch (TCC) 19
No engine braking in 1GR position of M range 22
Transaxle overheats 23
Engine stalls when shifted to D range, or in R position 24
Engine stalls when driving at slow speeds or stopping 25
Starter does not work 26Excessive shift shock is given when upshifting and
downshifting 18
Noise occurs at idle when vehicle is stopped in all
positions/ranges 20
Noise occurs at idle when vehicle is stopped in D
range, or in R position 21
Gear position indicator light illuminates in D range or P, N,
R positions 28Gear position indicator light does not illuminate in M range
Electrical system components
ATX inner parts
ATX outer parts
Hydraulic system
components
Control valve body 27
Does not shift up in M range
29
Does not shift down in M rangeSymptom item
Cause of trouble
Open/short
Malfunction signal is inputed Signal is inputed
Open/short
Open/short Open/short
Open/short
Open/short
Open/short
Open/short
Open/short Open/short
Open/short
Open/short Open/short
Control valve spool is not operating properly ATF amount
2-4 brake accumulator is not operating properly Low clutch solenoid accumulator is not operating properly
Direct clutch accumulator is not operating properly High clutch accumulator is not operating properly2-4 brake solenoid valve Pressure control solenoid
TCC solenoid valve
High clutch solenoid valve TFT sensor N-D select
Transaxle range switch
Power supply, GND
Shift solenoid A
Shift solenoid B
Shift solenoid C
Neutral shift solenoid valve
Reducation timing solenoid
GND return line
30Vehicle moves in N position 2
Vehicle moves in P position, or parking gear does not
disengage when P is disengaged 3
A6E5780W002

TROUBLESHOOTING
K2–187
K2
End Of Sie
Vehicle dose not move in D range, or in R position
X
X
X
XXX X
XX X
XX X
XX X XX
X
X
X X XX
XX
X XXXXXXXXX
XXX
X
X
X X
XX XXX
X
X
XX X
X
X
X X
X
X
X X
XX
X XXX X XXX
XX X 1
Excessive creep 4
No creep at all 5
Low maximum speed and poor acceleration 6
No shifting 7
Does not shift to fifth gear (5GR) 8
Abnormal shifting 9
Frequent shifting 10
Shift point is high or low 11
Torque converter clutch (TCC) non-operation 12
No kickdown 13
Engine flares up or slips when upshifting or downshifting 14
Engine flares up or slip when accelerating vehicle 15
Judder upon torque converter clutch (TCC) operation 16
Excessive shift shock from N to D or N to R position/range 17
Excessive shift shock on torque converter clutch (TCC) 19
No engine braking in 1GR position of M range 22
Transaxle overheats 23
Engine stalls when shifted to D range, or in R position 24
Engine stalls when driving at slow speeds or stopping 25
Starter does not work 26Excessive shift shock is given when upshifting and
downshifting 18
Noise occurs at idle when vehicle is stopped in all
positions/ranges 20
Noise occurs at idle when vehicle is stopped in D
range, or in R position 21
Gear position indicator light illuminates in D range or P, N,
R positions 28Gear position indicator light does not illuminate in M range
Hydraulic system
components
Control valve bodyPowertrain 27
Does not shift up in M range
29
Does not shift down in M range
Symptom item
Cause of trouble
Reduction accumulator is not operating properly
Clogging
Clogging
Clogging
Clogging
Clogging
Clogging
Clogging Clogging
Clogging
Slipping (clutch, brake) Oil cooler is not operating properly
Torque converter is not operating properly Burned (clutch, brake)
TCC piston is not operating properly TCC piston is cracking or peeling2-4 brake solenoid valve hydraulic circuit Pressure control solenoid hydraulic circuit
TCC solenoid valve hydraulic circuit
High clutch solenoid valve hydraulic circuit
Shift solenoid A hydraulic circuit
Shift solenoid B hydraulic circuit
Shift solenoid C hydraulic circuit
Neutral shift solenoid valve
Reducation timing solenoid valve
30Vehicle moves in N position 2
Vehicle moves in P position, or parking gear does not
disengage when P is disengaged 3
A6E5780W003