Mazda 2002 6 Workshop Manual page 657

STEP
2 VERIFY IF CURRENT CONCERNED INPUT
SIGNAL STATUS IS INTERMITTENT OR
CONSTANT
• Turn ignition key to OFF.
• Connect WDS or equivalent to DLC-2.
• Start engine and drive vehicle.
• Access LF_WSPD, LR_WSPD, RF_WSPD
and RR_WSPD using WDS or equivalent
• Do vehicle speeds correspond approximately
to the four PIDs above?
3 INSPECT WHEEL-SPEED SENSOR OUTPUT
PULSE
• Start engine and drive vehicle.
• Inspect output voltage pattern using an
oscilloscope.
• Is output voltage pattern okay?
4 INSPECT ABS WHEEL-SPEED SENSOR
CIRCUIT FOR SHORT TO GROUND
• Turn ignition key to OFF.
• Disconnect ABS (ABS/TCS) HU/CM and
wheel-speed sensor connectors.
• Inspect continuity between suspected sensor
terminal(s) of ABS (ABS/TCS) HU/CM
connector (harness side) and ground(s).
— RF wheel-speed sensor: G—ground
— LF wheel-speed sensor: I—ground
— RR wheel-speed sensor: A—ground
— LR wheel-speed sensor: C—ground
• Is there continuity?
5 INSPECT WHEEL-SPEED SENSOR
• Turn ignition key to OFF.
• Disconnect suspected wheel-speed sensor
connector(s) and inspect resistance between
wheel-speed sensor terminal(s) (part side).
• Is resistance within 1.3—1.7 kilohm?
6 INSPECT SENSOR ROTOR CLEARANCE
• Jack-up vehicle and support it with safety
stands.
• Remove suspected wheel(s).
• Inspect clearance between wheel-speed
sensor and sensor rotor.
• Is clearance within 0.3—1.1 mm {0.012—
0.043 in}?
7 INSPECT SENSOR ROTOR FOR DAMAGE
• Jack-up vehicle and support it with safety
stands.
• Remove suspected wheel(s).
• Visually inspect sensor rotor for missing,
deformed and obstructed teeth.
Number of teeth: 44
• Is sensor rotor okay?
ON-BOARD DIAGNOSTIC (ABS/TCS)
INSPECTION
Yes Go to Step 8.
No If there is a difference in speed of four wheels: Go to next
step.
If any wheel speed is 0 km/h {0 mph}: Go to Step 4.
Yes Go to Step 9.
No Go to Step 6.
Yes Repair or replace harness for short to ground circuit
between ABS (ABS/TCS) HU/CM and ABC wheel-sped
sensor, then go to Step 9.
No Go to next step.
Yes Go to next step.
No Replace wheel-speed sensor(s), then go to Step 9.
Yes Go to next step.
No Replace wheel-speed sensor(s), then go to Step 9.
Yes Go to next step.
No Replace sensor rotor, then go to Step 9.
ACTION
P–61
P