Mazda 6 2002, Workshop Manual

Page: 657 / 1248

ON-BOARD DIAGNOSTIC (ABS/TCS)
P–61
P
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?
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.
3 INSPECT WHEEL-SPEED SENSOR OUTPUT
PULSE
•
Start engine and drive vehicle.
•
Inspect output voltage pattern using an
oscilloscope.
Yes Go to Step 9.
No Go to Step 6.
•
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?
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.
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 ?
Yes Go to next step.
No Replace wheel-speed sensor(s), then go to Step 9.
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} ?
Yes Go to next step.
No Replace wheel-speed sensor(s), then go to Step 9.
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?
Yes Go to next step.
No Replace sensor rotor, then go to Step 9.
STEP INSPECTION ACTION