Mazda 6. Manual — part 250
P–56
ON-BOARD DIAGNOSTIC (ABS/TCS)
End Of Sie
DTC C1145, C1155, C1165, C1175
A6E697567650W10
Caution
• When attaching the tester lead to the ABS (ABS/TCS) HU/CM harness connector, the SST (49 G066
P–29 ABS (ABS/TCS) HU/CM INSPECTION
DTC
C1145
C1155
C1165
C1175
RF wheel-speed sensor
LF wheel-speed sensor
RR wheel-speed sensor
LR wheel-speed sensor
DETECTION
CONDITION
• Abnormal input is detected.
POSSIBLE
CAUSE
• Open or short to ground circuit in harness between ABS (ABS/TCS) HU/CM terminal and wheel-speed
sensor(s) terminal below
— ABS (ABS/TCS) HU/CM terminal G—RF ABS wheel-speed sensor terminal A
— ABS (ABS/TCS) HU/CM terminal D—RF ABS wheel-speed sensor terminal B
— ABS (ABS/TCS) HU/CM terminal I—LF ABS wheel-speed sensor terminal A
— ABS (ABS/TCS) HU/CM terminal E—LF ABS wheel-speed sensor terminal B
— ABS (ABS/TCS) HU/CM terminal A—RR ABS wheel-speed sensor terminal A
— ABS (ABS/TCS) HU/CM terminal B—RR ABS wheel-speed sensor terminal B
— ABS (ABS/TCS) HU/CM terminal C—LR ABS wheel-speed sensor terminal A
— ABS (ABS/TCS) HU/CM terminal F—LR ABS wheel-speed sensor terminal B
• ABS wheel-speed sensor(s) malfunction
ON-BOARD DIAGNOSTIC (ABS/TCS)
P–57
P
P–58
ON-BOARD DIAGNOSTIC (ABS/TCS)
Diagnostic procedure
End Of Sie
STEP
INSPECTION
ACTION
1
INSPECT WHEEL-SPEED SENSOR CIRCUIT
FOR OPEN CIRCUIT
• Turn ignition key to OFF.
• Disconnect ABS (ABS/TCS) HU/CM
connector.
• Measure resistance between suspected
sensor terminals of ABS (ABS/TCS) HU/CM
connector (harness side).
— RF wheel-speed sensor: G—D
— LF wheel-speed sensor: I—E
— RR wheel-speed sensor: A—B
— LR wheel-speed sensor: C—F
• Is resistance within 1.3—1.7 kilohm?
Yes
Go to next step.
No
Go to Step 3.
2
INSPECT WHEEL-SPEED SENSOR CIRCUIT
FOR SHORT TO GROUND
• Turn ignition key to OFF.
• Inspect continuity between suspected sensor
terminal(s) of ABS (ABS/TCS) HU/CM
connector (harness side) and ground(s).
— RF wheel-speed sensor: G—D
— LF wheel-speed sensor: I—E
— RR wheel-speed sensor: A—B
— LR wheel-speed sensor: C—F
• Is there continuity?
Yes
Repair or replace harness for short to ground circuit
between ABS (ABS/TCS) HU/CM and wheel-speed
sensor(s), then go to Step 5.
No
Go to Step 5.
3
INSPECT WHEEL-SPEED SENSOR
• Turn ignition key to OFF.
• Disconnect suspected sensor connector(s)
and inspect resistance between sensor
terminals (part side).
• Is resistance within 1.3—1.7 kilohm?
Yes
Go to next step.
No
Replace wheel-speed sensor, then go to Step 5.
4
INSPECT ABS (ABS/TCS) HU/CM TO
WHEEL-SPEED SENSOR CIRCUIT FOR
OPEN CIRCUIT
• Inspect continuity between suspected sensor
terminal(s) of ABS (ABS/TCS) HU/CM
connector (harness side) and wheel-speed
sensor connector. (vehicle harness side)
— RF wheel-speed sensor (+): G—A
— RF wheel-speed sensor (–): D—B
— LF wheel-speed sensor (+): I—A
— LF wheel-speed sensor (–): E—B
— RR wheel-speed sensor (+): A—A
— RR wheel-speed sensor (–): B—B
— LR wheel-speed sensor (+): C—A
— LR wheel-speed sensor (–): F—B
• Is there continuity?
Yes
Repair or replace poor connections of ABS (ABS/TCS) HU/
CM connector and/or wheel-speed sensor connector(s),
then go to next step.
No
Repair or replace harness for open circuits between ABS
(ABS/TCS) HU/CM and wheel-speed sensor(s), then go to
next step.
5
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory
• Is same DTC present?
Yes
Replace ABS (ABS/TCS) HU/CM, then go to next step.
No
Go to next step.
6
VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.
ON-BOARD DIAGNOSTIC (ABS/TCS)
P–59
P
DTC C1148, C1158, C1168, C1178, C1233, C1234, C1235, C1236
A6E697567650W11
Caution
• When attaching the tester lead to the ABS (ABS/TCS) HU/CM harness connector, the SST (49 G066
001) must be used. (See
P–29 ABS (ABS/TCS) HU/CM INSPECTION
DTC
C1148, C1234
C1158, C1233
C1168, C1235
C1178, C1236
RF wheel-speed sensor/sensor rotor
LF wheel-speed sensor/sensor rotor
RR wheel-speed sensor/sensor rotor
LR wheel-speed sensor/sensor rotor
DETECTION
CONDITION
• C1148, C1158, C1168, C1178:
— Abnormal sensor output is detected on any of four vehicle wheels when the vehicle goes from start
to a speed of 10 km/h {6.2 mph}.
— Greater than specified amount of ABS demand occurs from front wheel sensors when vehicle is
started.
• C1234, C1233, C1235, C1236:
— Abnormal sensor output due to chipping of sensor rotor teeth, etc. is detected
— ABS control operates for 60 seconds or more
POSSIBLE
CAUSE
• Short to ground circuit of wheel-speed sensor(s) circuit
• Malfunction of ABC wheel-speed sensor(s)
• Damaged sensor rotor(s)
• Incorrect clearance between ABC wheel-speed sensor and sensor rotor
• Poor installation of ABC wheel speed sensor and/or sensor rotor (If the sensor rotor is installed twisted,
it may cause output of abnormal wave form at high speeds.)
• ABS (ABS/TCS) HU/CM internal damage (Solenoid valve malfunction, pump motor malfunction, or pipe
clogging)
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