2002 MAZDA 6 ABS

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

R–1
R
RSUSPENSION
OUTLINE................................................................ R-2
OUTLINE OF CONSTRUCTION.......................... R-2
FEATURES .......................................................... R-2
SPECIFICATIONS ............................................... R-3
STRUCTURAL VIEW ...........................................R-4
REAR SUSPENSION............................................. R-5
SUSPENSION CONTROL SYSTEM ................... R-5
OUTLINE................................................................ R-7
SUPPLEMENTAL SERVICE INFORMATION .....R-7
WHEEL ALIGNMENT............................................. R-8
FRONT WHEEL ALIGNMENT (WGN).................R-8
REAR WHEEL ALIGNMENT (WGN) ................... R-9
REAR SUSPENSION........................................... R-11
SUSPENSION CONTROL SYSTEM
ON-VEHICLE INSPECTION (WGN) ...............R-11
REAR SHOCK ABSORBER
REMOVAL/INSTALLATION (WGN) ................ R-11
REAR SHOCK ABSORBER DISPOSAL
(WGN) .............................................................R-12
REAR STABILIZER
REMOVAL/INSTALLATION (4WD)................. R-13
TRAILING LINK REMOVAL/INSTALLATION
(4WD) .............................................................. R-14
REAR CROSSMEMBER
REMOVAL/INSTALLATION (4WD)................. R-16 FEATURES
SERVICE

OUTLINE
R–3
R
SPECIFICATIONSA6E740201013203
*1: Engine coolant and engine oil are at specified level. Fuel is full. Spare tire, jack and tools are in designated position.
*
2: Difference between left and right must not exceed 1 °30'.*3: Distance between wheel center and fender brim is following. 4SD and 5HB front: 402 mm {15.82 in} (reference
value) 4SD and 5HB rear: 401 mm {15.78 in} (reference value), WGN (2WD) front: 405 mm {15.94 in}
(reference value) WGN (2WD) rear: 407 mm {16.02 in} (reference value)
Bold frames: New specifications
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Item Specification
New Mazda6 Current
Mazda6
GG (4SD, 5HB) GY (WGN 2WD) GY (WGN 4WD) GG (4SD, 5HB)
Engine type LF, MZR-CD
(RF Turbo) L8, LF, L3,
MZR-CD (RF Turbo) L3 L8, LF, L3
Fr o nt
suspension Type High-mount double wishbone (with double-pivoted lower arm(s))
Spring type Coil spring
Shock absorber type
Cylindrical, double-acting
(Low-pressure gas charged with rebound spring)
Stabilizer Type Torsion bar
Diameter (mm {in}) 23 {0.91}
Wheel
alignment
(Unloaded)*
1
Total toe-in (mm {in}) Tire: 2
±4 {0.08 ±0.16}, Rim inner: 1 ±3 {0.04 ±0.12}
(degree) 0 °11 ′±0°22 ′
Maximum
steering
angle inner
18 inch wheel specification vehicles: 36
°±3°
Except for above: 39 °±3°
outer 18 inch wheel specification vehicles: 30
°±3°
Except for above: 31 °±3°
Caster
angle*
2
(reference
value) normal 3
°47 ′±1° 3°40 ′±1° 3°35 ′±1° 3°47 ′±1°
elevated*33 °42' ±1° 3°35 ′±1° —3 °42' ±1 °
Camber
angle*
2
(reference
value) normal –0
°17 ′±1° –0°15 ′±1° –0°08 ′±1° –0°17 ′±1°
elevated*3–0 °10' ±1° –0°08 ′±1° —–0 °10' ±1°
Steering
axis
inclination
(reference
value) normal 5
°28 ′ 5°24 ′ 5°16 ′ 5°28 ′
elevated
*35 °18' 5 °16 ′ —5 °18'
Rear
suspension Type E-type multi-link
Spring type Coil spring
Stabilizer
Type Torsion bar
Diameter (mm {in})
4SD: 19 {0.75}
5HB: 18 {0.71}18 {0.71} 21 {0.83}
4SD: 19 {0.75}
5HB: 18 {0.71}
Shock absorber type Cylindrical,
double-acting
(Low-pressure gas charged) Cylindrical,
double-acting
(Low-pressure gas charged)/
(High-pressure
gas charged) Cylindrical,
double-acting
(High-pressure gas charged) Cylindrical,
double-acting
(Low-pressure gas charged)
Wheel
alignment
(Unloaded)*
1
Total toe-in (mm {in}) Tire: 2
±4 {0.08 ±0.16}, Rim inner: 1 ±3 {0.04 ±0.12}
(degree) 0 °11 ′±0°22 ′
Camber
angle*
2
normal –1 °13 ′±1° –1°06 ′±1° –1°03 ′±1° –1°13 ′±1°
elevated
*3–1 °05 ′±1° –0°58 ′±1° —–1 °05 ′±1°
Thrust angle (degree) 0 °±0°48 ′

R–4
OUTLINE
STRUCTURAL VIEWA6E740201013204REAR SUSPENSION (4WD)
.
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98
7
5
4
3
1
2
10
116
12
A6E74162013
1 Rear crossmember mounting bushing
2 Rear crossmember
3 Rear shock absorber
4 Rear upper arm
5 Bound stopper (body side)
6 Rear trailing arm7 Rear lateral link
8 Rear stabilizer
9 View from vehicle rear side
10 Rear coil spring
11 Bound stopper (spring side)
12 Rear lower arm

REAR SUSPENSION
R–5
R
SUSPENSION CONTROL SYSTEMA6E741601013201Outline
•The self-leveling suspension is a system that adjusts the vehicle height according the amount of vehicle load.
This system will raise the rear of a vehicle, lowered due to a load placed on it, to the designated load level
* after
the vehicle has been driven a certain distance.
•The vehicle height adjustment is performed using a gas-pressurized pump function built into the rear shock
absorber.
•For the vehicle height to return to the designated load level, the vehicle must be driven approx. 5—6 km {3.1—
3.7 miles} in city driving conditions. (Distance will vary due to load and road conditions.)
•A load amount of approx. 140—300 kg {308—660 lb} at the rear axle will cause the vehicle height to be raised,
and any weight over that will prevent the vehicle from returning to the designated load level.
*: Designated load level is defined as the level at which the vehicle is with: a full fuel tank; engine coolant and oil at
specified levels; spare tire, jack and tools in designated positions; and four people, weighing 55 kg {121 lb} each,
riding in the vehicle.
Construction
.
REAR SUSPENSION
5
4
3
6
1
2
A6E74162001
1 Outlet check valve
2 Pump chamber
3 Low-pressure chamber4 High-pressure chamber
5Piston
6 Inlet check valve

R–6
REAR SUSPENSION
Operation
During leveling operation
•During shock absorber expansion, the inlet check valve opens due to negative pressure created in the pump
chamber, and oil is drawn into the pump chamber from the low-pressure chamber. During shock absorber
contraction, oil pressure in the pump chamber forces the outlet check valve to open, and oil in the pump
chamber flows through the pump cylinder into the high-pressure chamber. Due to this expansion and
contraction while driving, rod reaction force increases, and the vehicle height returns to the designated load
level. Also, similar to a regular shock absorber, damping is performed while driving with the damping valve.
.
Leveling operation completed
•When the vehicle height returns to the designated
load level, the volume of oil in the high-pressure
chamber increases and the piston rises. This
causes the pump chamber and the high-pressure
chamber to be connected at the pump rod notch,
and the expansion or contraction is completed.
.
87
5
4
3
6
1
2
A6E74162002
1 Pump chamber
2 Outlet check valve
3 Inlet check valve
4 Low-pressure chamber5 Damping valve
6 High-pressure chamber
7 Leveling operation (expansion)
8 Leveling operation (contraction)
1 Pump chamber
2Piston
3 Pump rod notch
4 High-pressure chamber
4
3
1
2
A6E74162003

REAR SUSPENSION, OUTLINE
R–7
R
During unloading of passengers and cargo
•When the vehicle height is higher than the
designated load level, oil flows back into the low-
pressure chamber from the high-pressure
chamber via the pump rod leveling port. As a
result, pressure in the high-pressure chamber
decreases, rod reaction force is reduced, and the
vehicle height returns to the designated load
level.
.
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SUPPLEMENTAL SERVICE INFORMATIONA6E740201013205•The following changes have been made since publication of the Mazda6 Workshop Manual (1730-1*-02C).
Front wheel alignment (WGN)
•Specifications have been added.
Rear wheel alignment (WGN)
•Specifications have been added.
Suspension control system (WGN)
•On-vehicle inspection procedure has been added.
Rear shock absorber (WGN)
•Removal/installation procedure has been added.
•Disposal procedure has been added.
Rear stabilizer (4WD)
•Removal/installation procedure has been added.
Trailing link (4WD)
•Removal/installation procedure has been added.
Rear crossmember (4WD)
•Removal/installation procedure has been added.
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1 Leveling port
2 Low-pressure chamber
3 High-pressure chamber
3
1
2
A6E74162004
OUTLINE

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