2002 MAZDA 6 relay

F2–230
TROUBLESHOOTING
Cooling Fan No.1/Cooling Fan No.2 Control System Inspection
Cooling fan No.1/cooling fan No.2 system operation
Cooling fan relay No.2
1. Connect the WDS or equivalent to DLC-2.
2. Verify that ECT PID is below main fan operating temperature.
3. Verify that A/C switch and fan switch are off.
4. Turn the engine switch to ON.
5. Verify that the cooling fan No.2 is not operating.
•If the cooling fan No.2 is operating:
(1) Select FAN PID.
(2) Send OFF and verify the cooling fan No.2 is off.
•If the cooling fan No.2 is on, inspect the following.
—Cooling fan relay No.2 stuck in closed position
—Short to GND circuit between cooling fan relay No.2 and PCM terminal 76
—Short to power in circuit at cooling fan relay No.2
—DTC for ECT sensor (P0117, P0118)
•If the cooling fan relay No.2 is off, inspect the following.
—Short to GND circuit between refrigerant pressure switch and PCM terminal 84
—DTC for ECT sensor (P0117, P0118)
6. Start the engine.
7. Verify that the cooling fan No.2 is operating when engine is hot.
•If the cooling fan No.2 does not operate, perform the following.
1. Connect WDS or equivalent to the DLC-2.
2. Select FAN PID.
3. Operate cooling fan No.2 by sending ON command.
4. Inspect if the operation sound is heard from the cooling fan relay No.2.
•If the operation sound is heard, inspect the wiring harness, connectors and cooling fan motor No.2.
•If the operation sound is not heard, inspect cooling fan relay No.2 and open circuit wiring harness
and connectors.
8. Turn the A/C switch and fan switch on.
9. Verify that cooling fan No.2 is operating.
•If fan does not operate, inspect A/C system.
Cooling fan relay No.1
1. Verify that A/C switch and fan switch are off.
2. Start the engine and let it idle.
3. Verify that the cooling fan No.1 is not operating.
•If cooling fan No.1 is operating, inspect for the following.
—Cooling fan relay No.1 is stuck in closed position.
—Short to power in circuit between cooling fan relay No.1 and cooling fan No.1
—Short to GND in circuit between refrigerant pressure switch and PCM terminal 84
—Short to GND circuit between cooling fan relay No.1 and PCM terminal 102
4. Turn the A/C switch and fan switch on.
5. Verify that the cooling fan No.1 is operating and operation sound of A/C compressor magnetic clutch is heard.
Engine conditionCooling fan
relay No.2Cooling fan
relay No.1
ECT below 100°C
{212°F}OFF OFF
ECT above 100°C
{212°F} (until below
97°C {207°F})ON OFF
ECT above 108°C
{228°F} (until below
105°C {230°F})ON ON
A/C and fan switches
are on.ON ON
ECT sensor
malfunctionON ON

TROUBLESHOOTING
F2–231
F2
6. Turn the A/C switch and fan switch off.
•If the cooling fan No.1 does not operate but operation sound of A/C compressor magnetic clutch is heard,
inspect for the following.
—Open circuit between ignition switch and cooling fan relay No.1
—Open circuit between battery and cooling fan relay No.1
—Open circuit between cooling fan relay No.1 and PCM terminal 102
—Open circuit between cooling fan relay No.1 and cooling fan motor No.1 or fan motor GND
—Cooling fan relay No.1 is stuck open.
—Cooling fan motor No.1
•If both additional fan and A/C compressor do not operate, inspect the following.
—A/C system
End Of Sie

AUTOMATIC TRANSAXLE
K2–59
K2
Operation
Upshift clutch engagement pressure feedback
•Clutch pressure (2) is learned so that gear shift time (1) becomes a predetermined target value, and thus
changes in performance and changes in the transaxle over time are minimized based on past gear shift results.
Upshift timing feedback (release-side clutch pressure)
•Clutch pressure release timing on the release side (2) is learned so that the change in engine speed (1) is
optimized, and thus clutch pressures on the engagement and release sides are optimized.
End Of SieN-D SELECT CONTROL DESCRIPTIONA6E571418901207•When the selector lever is switched from the P or N position to the driving ranges, or vice versa, the engine
speed change is minimized by regulating fuel injection volume in order to improve select feel.
•Range signals are output to the PCM in the following instances:
When the selector lever is switched from the P or N position to the driving ranges, or vice versa, and the
specified time has elapsed.
•The PCM regulates fuel injection volume based on inhibitor signals prevent change in engine speed.
End Of Sie
TORQUE CONVERTER CLUTCH (TCC) CONTROL DESCRIPTIONA6E571418901208Outline
Features
•The TCM selects the TCC schedule according to the gear selected by the transaxle. 50 Hz (20 ms cycle) on/off
signals are relayed from the TCC schedule and speed sensor and throttle opening angle to the duty cycle TCC
solenoid valve to control TCC.
8PCM
9 TFT sensor
10 TCM
11 TR switch
12 Pressure control solenoid
13 2-4 brake solenoid valve14 High clutch solenoid valve
15 GND return
16 R
17 D
18 N
19 P
AMU0517S038
AMU0517S039

K2–66
AUTOMATIC TRANSAXLE
P0711Transaxle fluid temperature (TFT)
sensor malfunction (stuck)•TFT sensor signal stays
outside normal temperature
range for 10 minute or more—Available
P0712Transaxle fluid temperature (TFT)
sensor circuit malfunction (short
circuit)•Signals form TFT sensor are
155 °C {311 °F} or greater
for 10 min.
•Inhibits feedback control
•Engine coolant temperature
signal are used for shifting.Available
P0713Transaxle fluid temperature (TFT)
sensor circuit malfunction (open
circuit)•Vehicle speed is 20 km/h
{12.4 mph} or greater, and
signals from TFT sensor are
–30 °C {–22 °F} or less for
150 seconds or moreAvailable
P0715Input/turbine speed sensor circuit
malfunction•Input/turbine speed sensor
is 600 rpm or less while
engine speed is 1500 rpm or
greater and vehicle speed is
40 km/h {24.8 mph} or
greater in D ranges.•Inhibits shift control Available
P0720Vehicle speedometer sensor
circuit malfunction•Parking gear rotation
detected by VSS is 150 rpm
or less while intermediate
sensor 1400 rpm or greater
in D range for 2 second or
more.•Inhibits SLOPE mode,
feedback control, torque
reduction controlAvailable
P0740Torque converter clutch (TCC)
system•RPM difference between
crankshaft (engine speed
signal) and reverse clutch
drum (input/turbine speed
sensor signal) exceeds the
pre-programmed value—Available
P0743Torque converter clutch (TCC)
solenoid valve malfunction (open/
short)•Open or short in torque
converter clutch solenoid
valve circuit (Voltage
different from on/off signal
relayed by CPU in TCM is
detected while TCM is
monitoring solenoid output
voltage.)•Stops driving of TCC
solenoid valve (OFF)Inhibition
P0748Pressure control solenoid
malfunction (open/short)•Open or short in pressure
control solenoid circuit
(Voltage different from on/off
signal relayed by CPU in
TCM is detected while TCM
is monitoring solenoid
output voltage.)•Stops driving of pressure
control solenoid, 2-4 brake
solenoid valve, and high
clutch solenoid valve (OFF)
•Inhibit feedback control.Available
P0751Shift solenoid A malfunction
(stuck off)•Difference between actual
gear ratio and gear ratio set
in TCM is large—Available
P0752Shift solenoid A malfunction
(stuck on)•Difference between actual
gear ratio and gear ratio set
in TCM is large—Available
P0753Shift solenoid A malfunction
(open/short)•Open or short in shift
solenoid A circuit (Voltage
different from on/off signal
relayed by CPU in TCM is
detected while TCM is
monitoring solenoid output
voltage.)•Stops driving all ON/OFF
type solenoids (OFF) and
TCC solenoid valve (OFF)Inhibition
P0756Shift solenoid B malfunction
(stuck off)•Difference between actual
gear ratio and gear ratio set
in TCM is large—Available
P0757Shift solenoid B malfunction
(stuck on)•Difference between actual
gear ratio and gear ratio set
in TCM is large—Available DTC
No.On-board diagnostic function Detection condition Fail-safe TCC

AUTOMATIC TRANSAXLE
K2–67
K2
P0758Shift solenoid B malfunction
(open/short)•Open or short in shift
solenoid B circuit (Voltage
different from on/off signal
relayed by CPU in TCM is
detected while TCM is
monitoring solenoid output
voltage.)•Stops driving all ON/OFF
type solenoids (OFF) and
TCC solenoid valve (OFF)Inhibition
P0761Shift solenoid C malfunction
(stuck off)•Difference between actual
gear ratio and gear ratio set
in TCM is large—Available
P0762Shift solenoid C malfunction
(stuck on)•Difference between actual
gear ratio and gear ratio set
in TCM is large—Available
P0763Shift solenoid C malfunction
(open/short)•Open or short in shift
solenoid C circuit (Voltage
different from on/off signal
relayed by CPU in TCM is
detected while TCM is
monitoring solenoid output
voltage.)•Stops driving all ON/OFF
type solenoids (OFF) and
TCC solenoid valve (OFF)Inhibition
P0768Reduction timing solenoid valve
malfunction (open/short)•Open or short in reduction
timing solenoid valve circuit
(Voltage different from on/off
signal relayed by CPU in
TCM is detected while TCM
is monitoring solenoid
output voltage.)•Stops driving of reduction
timing solenoid valve (OFF)Available
P0773Neutral shift solenoid valve
malfunction (open/short)•Open or short in neutral shift
solenoid valve circuit
(Voltage different from on/off
signal relayed by CPU in
TCM is detected while TCM
is monitoring solenoid
output voltage.)•Stops driving of neutral shift
solenoid valve (OFF)Available
P07782-4 brake solenoid valve
malfunction (open/short)•Open or short in 2-4 brake
solenoid valve circuit
(Voltage different from on/off
signal relayed by CPU in
TCM is detected while TCM
is monitoring solenoid
output voltage.)•Stops driving of pressure
control solenoid, 2-4 brake
solenoid valve, and high
clutch solenoid valve (OFF)
•Inhibit feedback control.Available
P0791Intermediate sensor malfunction
(open/short)•Rotation speed of output
gear (intermediate sensor)
is low when vehicle speed
and engine speed exceed
the pre programmed value•Inhibit feedback control
•Inhibits torque reduction
controlAvailable
P0798High clutch solenoid valve
malfunction (open/short)•Open or short in high clutch
solenoid valve circuit
(Voltage different from on/off
signal relayed by CPU in
TCM is detected while TCM
is monitoring solenoid
output voltage.)•Stops driving of pressure
control solenoid, 2-4 brake
solenoid valve, and high
clutch solenoid valve (OFF)
•Inhibit feedback control.Available
P1710 GND return malfunction•TCM detects open in GND
return signal of solenoid.—Available
U0073 CAN BUS OFF•CAN controller damaged.•Throttle valve opening angle
is fixed (4/8) at the time in
order to determine shift
•Maximizes line pressureInhibition
U0100TCM cannot receive any signals
from PCM•TCM cannot receive any
signals from PCM DTC
No.On-board diagnostic function Detection condition Fail-safe TCC

K2–94
AUTOMATIC TRANSAXLE
Inspection Using An Oscilloscope (Reference)
Input/turbine speed sensor signal
•TCM terminal: 1N (+)—2F (–)
•Oscilloscope setting: 1 V/DIV (Y) 1 ms/DIV (X)
•Measuring condition: Turbine speed at 700 rpm,
N position
Intermediate sensor signal
•TCM terminal: 1K (+)—1X (–)
•Oscilloscope setting: 4 V/DIV (Y) 0.2 ms/DIV (X)
•Measuring condition: Vehicle speed at 40 km/h
{25 mph}, 4GR
Vehicle speedometer sensor signal
•TCM terminal: 1M (+)—1V (–)
•Oscilloscope setting: 4 V/DIV (Y) 1 ms/DIV (X)
•Measuring condition: Vehicle speed at 40 km/h
{25 mph}
2Y Pressure control
solenoid controlPressure control
solenoidN position B+•Inspect pressure control
solenoid
(See K2–88 SOLENOID
VALVE INSPECTION)
•Inspect related harness D position stall 0
2Z Power supply Main relay Ignition switch ON B+•Inspect main relay
(See T–19 Relay Type)
•Inspect related harness Ignition switch OFF 0
2AA Power supply Main relay Ignition switch ON B+•Inspect main relay
(See T–19 Relay Type)
•Inspect related harness Ignition switch OFF 0 Terminal Signal Connected to Test Condition Voltage (V) Action
AMU0517W045
AMU0517W046
AMU0517W047

K2–180
ON-BOARD DIAGNOSTIC
End Of SiePID/DATA MONITOR INSPECTIONA6E5770189012301. Connect the SSTs (WDS or equivalent) to the DLC-2.
2. Turn the ignition switch to ON.
3. Measure the PID value.
Note
•Perform part inspection for the output device after TCM inspection.
•The PID/DATA MONITOR function monitors the calculated value of the input/output signals in the TCM.
Therefore, if a monitored value of an output device is out of specification, it is necessary to inspect the
monitored value of the input device related to the output device control. Since an output device
malfunction is not directly indicated as a malfunction of the monitored value for the output device, it is
necessary to inspect the output device individually using the simulation function, etc.
PID/DATA MONITOR AND RECORD function table
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
Monitor item
(Definition)Unit/
ConditionCondition/Specification ActionTCM
terminal
2-4 B Duty
(2-4 brake
solenoid vale)ON/OFFN position: ON
M range (1GR) stall: OFFInspect 2-4 brake solenoid valve.
(See K2–88 SOLENOID VALVE
INSPECTION.)2V
BOO
(Brake switch)ON/OFFBrake pedal depressed: ON
Other: OFFInspect brake switch.
1U
DWN_SW
(Down switch)ON/OFFDown sift at M range: ON
Other: OFFInspect selector lever component.
1S
GEAR
(Calculated
gear range in
TCM)1ST/2ND/
3RD/4TH/
5TH1GR: 1ST
2GR: 2ND
3GR: 3RD
4GR: 4TH
5GR: 5THInspect following PIDs: THOP, TSS
–
H/C Duty
(High clutch
solenoid valve)%N position: OFF
D range 1GR to 2GR shifting: ONInspect high clutch solenoid valve.
(See K2–88 SOLENOID VALVE
INSPECTION.)2U
LPS
(Pressure
control
solenoid)%Ignition switch ON: 0%
Idle: 0—100%Inspect pressure control solenoid.
(See K2–88 SOLENOID VALVE
INSPECTION.)2Y
MNL_SW
(M range
switch)ON/OFFM range: ON
Other: OFFInspect selector lever component.
1AA
NSFT TIM
(Neutral shift
solenoid valve)ON/OFFN position: OFF
R position inhibition control: ONInspect main relay.
(See T–19 RELAY INSPECTION.)
Inspect battery.
(See G–6 BATTERY INSPECTION.)2D
OSS
(Intermediate
sensorrpmIgnition switch ON: 0 rpm
Idle: 700—800 rpmInspect intermediate sensor.
(See K2–86 INTERMEDIATE SENSOR
INSPECTION.)1K, 1X
PNP
(TR switch (P/
N position
switch))ON/OFFP or N position: ON
R position and all ranges: OFFInspect TR switch.
(See K2–88 SOLENOID VALVE
INSPECTION.)–
RDCN TIM
(Reduction
timing solenoid
valve)ON/OFFN position: OFF
D range: ONInspect reduction timing solenoid valve.
(See K2–88 SOLENOID VALVE
INSPECTION.)2G
RPM
(Engine speed)rpmIgnition switch ON: 0 rpm
Idle: 700—800 rpmInspect TCM.
(See K2–90 TCM INSPECTION.)–
SSA/SS1
(Shift solenoid
A)ON/OFFN position: ON
D range 3GR: OFFInspect shift solenoid A.
(See K2–88 SOLENOID VALVE
INSPECTION.)–

ON-BOARD DIAGNOSTIC
K2–181
K2
End Of Sie
SSB/SS2
(Shift solenoid
B)ON/OFFN position: ON
D range 4GR: OFFInspect shift solenoid B.
(See K2–88 SOLENOID VALVE
INSPECTION.)–
SSC/SS3
(Shift solenoid
C)ON/OFFN position: ON
D range 2GR: OFFInspect shift solenoid C.
(See K2–88 SOLENOID VALVE
INSPECTION.)–
TCCC
(TCC solenoid
valve)%TCC operating: ON
TCC non operating: OFFInspect TCC solenoid valve.
(See K2–88 SOLENOID VALVE
INSPECTION.)2S
TFT
(ATF
temperature)°CATF 20 °C {68 °F}: 20 °C {68 °F}
ATF 60 °C {140 °F}: 60 °C {140 °F}Inspect TFT sensor.
(See K2–84 TRANSAXLE FLUID
TEMPERATURE (TFT) SENSOR
INSPECTION.)1B, 1F
TFTV
(ATF
temperature
signal voltage)VATF 20 °C {68 °F}: 1.55 V
ATF 60°C {140 °F}: 0.7 VInspect TFT sensor.
(See K2–84 TRANSAXLE FLUID
TEMPERATURE (TFT) SENSOR
INSPECTION.)1B, 1F
THOP
(Throttle
position)%CTP:0%
WOT: 100%Inspect TCM.
(See K2–90 TCM INSPECTION.)–
TRD
(TR switch [D
range])ON/OFFD range: ON
Other ranges and all positions: OFFInspect TR switch.
(See K2–80 TRANSAXLE RANGE (TR)
SWITCH INSPECTION.)1Z
TRR
(TR switch [R
position])ON/OFFR position: ON
Other positions and all ranges: OFFInspect TR switch.
(See K2–80 TRANSAXLE RANGE (TR)
SWITCH INSPECTION.)1W
TSS
(Input/turbine
speed sensor)rpmIgnition switch ON: 0 rpm
Idle: 700—800 rpmInspect input/turbine speed sensor.
(See K2–85 INPUT/TURBINE SPEED
SENSOR INSPECTION.)1N, 2F
UP_SW
(Up switch)ON/OFFUp sift at M range: ON
Other: OFFInspect selector lever component.
2C
VPWR
(Battery
voltage)VIG ON: B+
Idle: 13—14 VInspect main relay.
1P
VSS
(Vehicle
speed)km/hVehicle speed 20 km/h {12.5 mph}: 20
km/h {12.5 mph}
Vehicle speed 40 km/h {25 mph}: 40 km/
h {25 mph}Inspect vehicle speedometer sensor.
(See K2–87 VEHICLE SPEEDOMETER
SENSOR (VSS) INSPECTION.)1V, 1M Monitor item
(Definition)Unit/
ConditionCondition/Specification ActionTCM
terminal