2002 MAZDA 6 sensor

P–24
ON-BOARD DIAGNOSTIC
ABSRF_I
(Right front ABS pressure
retention solenoid valve output
state)ON/OFF•During ABS control: ON/
OFF
(solenoid valve is activated/
deactivated)
•Not ABS control: OFF
(solenoid valve is
deactivated)Internal fault of ABS
(ABS/TCS) or DSC
HU/CM. Replace ABS
(ABS/TCS) or DSC
HU/CM.—
ABSLF_I
(Left front ABS pressure
retention solenoid valve output
state)ON/OFF•During ABS control: ON/
OFF
(solenoid valve is activated/
deactivated)
•Not ABS control: OFF
(solenoid valve is
deactivated)Internal fault of ABS
(ABS/TCS) or DSC
HU/CM. Replace ABS
(ABS/TCS) or DSC
HU/CM.—
ABSVLVRLY
(Fail-safe relay output state)ON/OFF•Fail-safe relay is
activated: ON
•Fail-safe relay is
deactivated: OFFInspect ABS (ABS/
TCS) or DSC HU/CM.
—
ABSPMPRLY
(Motor relay output state)ON/OFF•Motor relay is activated: ON
•Motor relay is deactivated:
OFFInspect ABS (ABS/
TCS) or DSC HU/CM.—
SWA POS (with DSC only)
(Steering angle sensor input)ANGLE•Steering wheel is in neutral
position: 0 DEG
•Steering wheel is turned to
left: Changes between
0 DEG and -1,638.40 DEG
•Steering wheel is turned to
right: Changes between
0 DEG and 1,638.35 DEGInspect steering angle
sensor.
R, U, W, X
LF_WSPD
(Left front wheel-speed sensor
input)SPEED•Vehicle is stopped: 0 KPH
{0 MPH}
•Vehicle is driving: Indicates
vehicle speedInspect wheel-speed
sensor/sensor rotor.ABS (ABS/
TCS): E, I
DSC: F, J
RF_WSPD
(Right front wheel-speed
sensor input)SPEED•Vehicle is stopped: 0 KPH
{0 MPH}
•Vehicle is driving: Indicates
vehicle speedInspect wheel-speed
sensor/sensor rotor.ABS (ABS/
TCS): D, G
DSC: I, M
LR_WSPD
(Left rear wheel-speed sensor
input)SPEED•Vehicle is stopped: 0 KPH
{0 MPH}
•Vehicle is driving: Indicates
vehicle speedInspect wheel-speed
sensor/sensor rotor.ABS (ABS/
TCS): C, F
DSC: N, Q
RR_WSPD
(Right rear wheel-speed
sensor input)SPEED•Vehicle is stopped: 0 KPH
{0 MPH}
•Vehicle is driving: Indicates
vehicle speedInspect wheel-speed
sensor/sensor rotor.ABS (ABS/
TCS): A, B
DSC: H, K
LAT ACC (with DSC only)
(Lateral-G sensor input)ACCELERATION•Vehicle is stopped or driving
straight: 0 G
•Cornering to left: Changes
between 0 G and 1.27 G
•Cornering to right: Changes
between 0 G and -1.28 GInspect ABS wheel-
speed sensor/sensor
rotor.
O
YAW_RATE (with DSC only)
(Yaw rate sensor input)ACCELERATION•Vehicle is stopped or driving
straight: 0 DG/S
•Cornering to left: Changes
between 0 DG/S and 127
DG/S
•Cornering to right: Changes
between 0 DG/S and -128
DG/SInspect combine
sensor.
T
MCYLI P (with DSC only)
(Brake fluid pressure sensor
input)PRESSURE•Brake pedal is released:
0 MPa
•Brake pedal is depressed:
Changes between 0 MPa
and 25.5 MPaInspect DSC HU/CM.
— PID Name
(Definition)Unit/Condition Condition/Specification ActionABS (ABS/
TCS) HU/CM or
DSC HU/CM
terminal

ON-BOARD DIAGNOSTIC
P–25
P
End Of Sie
TCSOUTD
(Torque reduction request
value)PERCENTAGE•Torque reduction is not
requested: 0 %
•Torque reduction is
requested: Changes
between 0 % and 100 %Inspect DSC HU/CM.
—
TPI (with DSC only)
(Throttle position signal input)PERCENTAGE•Closed throttle position: 0
•Wide open throttle: Changes
between 1 and 7Inspect PCM and
throttle position
sensor.—
ABS_VOLT
(System battery voltage value)VOLTAGE•Ignition key at ON: B+
•Idle: Approx. 14—16 VInspect power supply
circuit.ABS (ABS/
TCS): Z
DSC: G
ACCLMTR
*
(Accelerometer)ACCELERATION•Vehicle is stopped or driving
at a constant speed: 0 G.
•Vehicle is driving at a
acceleration: Changes
between 0— –1.28 G.
•Vehicle is driving at a
deceleration: Changes
between 0—1.27 G.Inspect combine
sensor.
V PID Name
(Definition)Unit/Condition Condition/Specification ActionABS (ABS/
TCS) HU/CM or
DSC HU/CM
terminal

ON-BOARD DIAGNOSTIC
P–27
P
Diagnostic procedure
End Of Sie
DTC C1949, C1950A6E697067650203
Caution
•When attaching the tester lead to the DSC HU/CM connector, the SST (49 G066 004) must be used.
STEP INSPECTION ACTION
1CHECK FOR PCM FOR DTCs
•Turn ignition key to OFF.
•Connect WDS or equivalent to DLC-2
•Turn ignition key to ON (engine OFF).
•Is DTC for engine control system obtained?Yes Follow inspection procedures for engine control system.
No Go to next step.
2MONITOR CAN SIGNAL
•Access PID RPM and TP using WDS or
equivalent.
•Are engine speed and throttle position within
specification?Yes Go to next step.
No Follow inspection procedures for engine control system.
3VERIFY TROUBLESHOOTING COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from memory.
•Start engine.
•Is same DTC present?Yes Replace DSC HU/CM, then go to next step.
No Troubleshooting completed.
DTC C1949, C1950 Combine sensor (forward G-sensor)
DETECTION
CONDITION•C1949:
—Monitor voltage of forward-G sensor is detected at 4.5 V or more, or 0.5 V or less.
—Monitor voltage difference of 0.4 V or more within 1 cycle is detected 8 times in 1 second.
•C1950:
—Forward-G sensor 0-point correction value is default or more
—Output voltage value from G sensor remains absolutely unchanged
—Difference between estimated G-force calculated from 2 channels exceeds specification
POSSIBLE
CAUSE•Open circuit in harness between combine sensor terminal C and DSC HU/CM terminal P
•Open circuit, short to power, or short to ground in harness between DSC HU/CM terminal V and
combine sensor terminal A
•Open circuit, short to power, or short to ground in harness between DSC HU/CM terminal S and
combine sensor terminal F
•Open circuit in harness between combine sensor terminal E and DSC HU/CM terminal Y
•Malfunction of combine sensor

P–28
ON-BOARD DIAGNOSTIC
Diagnostic procedure
STEP INSPECTION ACTION
1INSPECT COMBINE SENSOR POWER
SUPPLY CIRCUIT FOR OPEN CIRCUIT
•Turn ignition key to ON (engine OFF).
•Measure voltage between combine sensor
terminal C (harness side) and ground.
•Is voltage 4.5—5.5 V?Yes Go to next step.
No Repair or replace harness for open circuit between combine
sensor terminal C and ignition switch, then go to Step 8.
2INSPECT COMBINE SENSOR GROUND
CIRCUIT FOR OPEN CIRCUIT
•Turn ignition key to OFF.
•Disconnect DSC HU/CM and combine
sensor connectors.
•Inspect continuity between DSC HU/CM
terminal Y (harness side) and combine
sensor terminal E (harness side).
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open circuit between DSC
HU/CM terminal Y and combine sensor terminal E, then go
to Step 8.
SST (49 G066 004)
AQ
B
CDE
FG
HI
J DSC HU/CM HARNESS SIDE CONNECTOR
A
C E
H
K N Q
T
W Z AC AF
F I L O R U X
AA AD AG
G
J
M P S
V
Y AB
AE AHB
DKN
T
WZ
AC
AFLO
RU
XAA
ADAGMP
SV
YAB
AEAH 5V
REGULATOR
COMBINE SENSOR
FA B C D E COMBINE SENSOR HARNESS
SIDE CONNECTOR C
F
D
A
B
EP
S
T
V
O
YDSC HU/CM

ON-BOARD DIAGNOSTIC
P–29
PEnd Of Sie
DTC U2511A6E697067650204
Diagnostic procedure
•Follow inspection procedures for CAN. (See T–39 MULTIPLEX COMMUNICATION SYSTEM.)
End Of Sie
3INSPECT FORWARD-G SENSOR PART
SIGNAL CIRCUIT FOR OPEN CIRCUIT
•Inspect continuity between DSC HU/CM
terminal V (harness side) and combine
sensor terminal A (harness side).
•Is there continuity?Yes Go to next step.
No Repair or replace harness for open circuit between DSC
HU/CM terminal V and combine sensor terminal A, then go
to Step 8.
4INSPECT FORWARD-G SENSOR PART
SIGNAL CIRCUIT FOR SHORT TO GROUND
•Turn ignition key to OFF.
•Inspect continuity between DSC HU/CM
terminal V (harness side) and ground.
•Is there continuity?Yes Repair or replace harness for short to ground circuit
between DSC HU/CM terminal V and combine sensor
terminal A, then go to Step 8.
No Go to next step.
5INSPECT DIAGNOSIS SIGNAL CIRCUIT FOR
SHORT FOR OPEN CIRCUIT
•Turn ignition key to OFF.
•Inspect continuity between DSC HU/CM
terminal S (harness side) and combine
sensor terminal F.
•Is there continuity?Yes Repair or replace harness for open circuit between DSC
HU/CM terminal S and combine sensor terminal F, then go
to Step 8.
No Go to next step.
6INSPECT DIAGNOSIS SIGNAL CIRCUIT FOR
SHORT TO GROUND
•Turn ignition key to OFF.
•Inspect continuity between DSC HU/CM
terminal S (harness side) and ground.
•Is there continuity?Yes Repair or replace harness for short to ground circuit
between DSC HU/CM terminal S and combine sensor
terminal F, then go to Step 8.
No Go to next step.
7INSPECT COMBINE SENSOR
•Inspect combine sensor.
•Is it okay?Yes Go to next step.
No Replace combine sensor, then go to next step.
8VERIFY TROUBLESHOOTING COMPLETED
•Clear DTC from memory.
•Is same DTC present?Yes Replace DSC HU/CM, then go to next step.
No Go to next step.
9VERIFY AFTER REPAIR PROCEDURE
•Is there any other DTC present?Yes Go to applicable DTC inspection.
No Troubleshooting completed. STEP INSPECTION ACTION
DTC U2511 CAN communication
DETECTION
CONDITION•Detects that the communication signals from 4WD CM is abnormal.
POSSIBLE
CAUSE•4WD CM signals have communication error.

REAR SUSPENSION
R–11
R
SUSPENSION CONTROL SYSTEM ON-VEHICLE INSPECTION (WGN)A6E7416010132021. Pull up the dust boot and visually inspect the piston rod for oil leakage.
2. Remove all cargo and drive the vehicle, with only the driver aboard, for 1 km {0.62 miles} or more. After
driving, verify that the rear vehicle height (distance measured from the fender brim to the center of the wheel) is
360 mm {14.2 in} or more
*. If not as specified, replace the rear shock absorbers.
3. Place a load equivalent to five people riding in
order to make the rear vehicle height to be 330
mm {13.0 in} or less.
4. Immediately after driving the vehicle for 5 km {3.0
miles} or more, under the same load conditions,
verify that the rear vehicle height is 335 mm {13.2
in} or more. If not as specified replace the rear
shock absorbers.
*: Indicates rear vehicle height with fuel tank full.
Height will vary 6—8 mm {0.24—0.31 in} between a
full and empty fuel tank.
End Of SieREAR SHOCK ABSORBER REMOVAL/INSTALLATION (WGN)A6E741628700201
Caution
•Performing the following procedures without first removing the ABS wheel-speed sensor may
possibly cause an open circuit in the harness if it is pulled by mistake. Before performing the
following procedures, remove the ABS wheel-speed sensor (axle side) and fix it to an appropriate
place where the sensor will not be pulled by mistake while servicing the vehicle.
1. Remove in the order indicated in the table.
2. Install in the reverse order of removal.
REAR SUSPENSION
SECTION
A—AMEASURING POINT
A
A
A6E7412W001
1 Rear shock absorber and bracket
2Bracket
(See R–12 Bracket Installation Note)
3 Rear shock absorber
1
3
37.2—51.9
{3.80—5.29,
27.5—38.2}
286.2—116.6
{8.80—11.88,
63.58—85.99}
86.2—116.6
{8.80—11.88,
63.58—85.99}
N·m {kgf·m, ft·lbf}
A6E74162006

REAR SUSPENSION
R–13
R
REAR STABILIZER REMOVAL/INSTALLATION (4WD)A6E7416281002011. Remove the rear auto leveling sensor.
(See T–20 REAR AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
2. Remove in the order indicated in the table.
3. Install in the reverse order of removal.
4. Adjust the headlight zeroset.
.
Bolt (Differential Front Side) Removal Note
1. Disconnect differential oil temperature sensor connector and 4WD solenoid connector.
2. Support the differential with a jack as shown in
the figure.
3. Remove the bolt.
5
4
3
1
AA
2
6
GREASEGREASE
43.1—60.8
{4.40—6.19,
31.8—44.8}
74.5—104.9
{7.60—10.69, 54.95—77.37}
43.1—60.8
{4.40—6.19,
31.8—44.8}
RUBBER
GREASE
43.1—60.8
{4.40—6.19,
31.8—44.8}
N·m {kgf·m, ft·lbf} 75.5—94.5
{7.70—9.63, 55.7—69.6}
A6E74162007
1 Stabilizer control link
2 Coil spring component (One side only)
3 Stabilizer bracket
4 Bushing5 Bolt (Differential front side)
(See R–13 Bolt (Differential Front Side) Removal
Note)
(See R–14 Bolt (Differential Front Side) Installation
Note)
6 Rear stabilizer
JACK
A6E74162011

R–14
REAR SUSPENSION
Bolt (Differential Front Side) Installation Note
1. Support the differential with a jack, and then
install the bolt.
2. Connect differential oil temperature sensor
connector and 4WD solenoid connector.
End Of SieTRAILING LINK REMOVAL/INSTALLATION (4WD)A6E741628200201
Caution
•Performing the following procedures without first removing the ABS wheel-speed sensor may
possibly cause an open circuit in the harness if it is pulled by mistake. Before performing the
following procedures, remove the ABS wheel-speed sensor (axle side) and fix it to an appropriate
place where the sensor will not be pulled by mistake while servicing the vehicle.
1. Remove in the order indicated in the table.
2. Install in the reverse order of removal.
3. Inspect the rear wheel alignment.
(See R–9 REAR WHEEL ALIGNMENT (WGN).)
JACK
A6E74162011