Mazda MX-6 1998, Workshop Manual, Page: 628 / 1282

TROUBLESHOOTING
C1148
DTC 01158
ÜTC C1168
C1178
Right front ABS wheel-speed sensor/sensor rotor
Left front ABS wheel-speed sensor/sensor rotor
Right rear ABS wheel-speed sensor/sensor rotor
Left rear ABS wheel-speed sensor/sensor rotor
DESCRIPTION Wheel speed signal is out of specification during a vehicle is stopped or starting
POSSIBLE
CAUSE
• Open or short circuit of ABS wheel-speed sensor
• Damaged ABS sensor rotor
STEP
INSPECTION ACTION
1 Inspect clearance between sensor and rotor, and
output voltage.
tr 0 4 -1 3 FRONT ABS WHEEL-SPEED
SENSOR INSPECTION
Is sensor okay?
Yes Go to next step.
No Replace ABS wheel-speed sensor.
2 With ABS CM is disconnected, inspect resistance
between following sensor terminals of harness
connector.
RF: P -O , LF: Q -R , RR: M (N )*-L, LR: T -C
Resistance
1.28— 1.92 k£2
Is it as specified?
Yes Go to next step.
No Repair harness between sensor and ABS CM.
3
With ABS CM is disconnected, inspect resistance
between sensor terminals and ground.
RF: P -D , LF: Q -D , RR: M (N )*-D , LR: T -D
Resistance
Less than 5 a
Are they as specified?
Yes Go to step 2 of DTC 1222 chart.
No
There is a short to ground.
Inspect short point and repair it as necessary.
04
* : Models with TCS
DTC C1222 ABS wheel-speed sensor
DESCRIPTION Wheel speed signal is out of specification
POSSIBLE
CAUSE
• Malfunction of ABS wheel-speed sensor
• Damaged ABS sensor rotor
STEP
INSPECTION
ACTION
1
Inspect clearance between sensor and rotor, and
output voltage.
c r 0 4 -1 3 FRONT ABS WHEEL-SPEED
SENSOR INSPECTION
Is sensor okay?
Yes
Go to next step.
No Replace ABS wheel-speed sensor.
2 Inspect wheel bearing play.
c r 03-11 FRONT WHEEL BEARING PLAY
INSPECTION
Is wheel bearing play within specification?
Wheel bearing play
0.05 mm {0.002 in}
Yes Go to next step.
No Repair or replace damaged part.
3
Visually inspect sensor rotor for missing,
deformation and obstruction of teeth.
Is there looseness or damage?
Yes
Replace ABS sensor rotor.
No Go to next step.
4
• Connect the SST (NGS)
• Select PID WSPD of appropriate wheel
• Drive vehicle and note PID
• Is PID active?
Yes System is normal.
No
Inspect poor connection in ABS CM connector and poor
contact in ABS CM wheel-speed sensor terminals.
Repair or replace terminal as necessary.
0 4 -0 1 -9