Mazda 6 2002 Workshop Manual page 669

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
STEP
4 INSPECT PID/DATA IN ABS/TCS HU/CM
Inspect the following items using WDS or
equivalent PID/DATA monitor function.
• ABS_LAMP (ABS warning light)
• BRAKE_ LAMP (BRAKE system warning
light)
• ABS_VOLT (power supply voltage)
Is ABS_LAMP and BRAKE_LAMP ON after
more than 4 seconds with ignition switch on?
5 INSPECT ABS/TCS HU/CM IGNITION POWER
SUPPLY SYSTEM (TERMINAL Z)
Check the voltage for PID/DATA monitor
ABS_VOLT item.
Specification: about 10 V
Is voltage within specification?
6 INSPECT BATTERY
Is battery voltage normal?
7 INSPECT CHARGING SYSTEM
Is battery voltage normal with electrical load (A/
C, headlight, etc.) on and engine idling?
* INSPECT WIRING HARNESS BETWEEN ABS/
8
TCS HU/CM POWER SUPPLY AND ABS/TCS
HU/CM FOR CONTINUITY
Disconnect ABS/TCS HU/CM connector.
Connect the SST (49 G066 001) (vehicle
harness side only).
Is voltage approimately 12 V at SST
connector terminal Z?
*
INSPECT WIRING HARNESS BETWEEN ABS/
9
TCS HU/CM GROUND FOR CONTINUITY
Turn ignition switch to LOCK.
Is there continuity between SST connector
terminal AC and ground?
*
INSPECT WIRING HARNESS BETWEEN ABS/
10
TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR CONTINUITY
Is there continuity between SST connector
terminal X and DLC-2?
*
11
INSPECT WIRING HARNESS BETWEEN
ABS/TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR SHORT TO BATTERY
Is voltage approimately 12 V at SST
connector terminal X?
12 *
INSPECT WIRING HARNESS BETWEEN
ABS/TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR SHORT TO GROUND
Is there continuity between SST connector
Terminal X and DLC-2?
P–112
INSPECTION
Yes Go to Step 7.
No Go to net step.
Yes Replace ABS/TCS HU/CM (open or short in ground circuit in
ABS/TCS HU/CM)
No Go to net step.
Yes Go to net step.
No Inspect battery and charging system.
Yes Go to Step 7.
No Inspect charging system (drive belt tension, generator, etc.).
Yes Go to net step.
No Check for connection of ABS/TCS HU/CM connector
securely.
Yes If a malfunction error message is displayed on WDS or
equivalent in Step 1 inspection, go to net step.
If a malfunction error message is not displayed on WDS or
equivalent in Step 1 inspection, troubleshooting is
completed.
No Repair wiring harness between ABS/TCS HU/CM and
ground.
Yes Go to net step.
No Repair wiring harness between ABS/TCS HU/CM and
DLC-2.
Yes Repair wiring harness between ABS/TCS HU/CM and
DLC-2.
No Go to net step.
Yes Repair wiring harness between ABS/TCS HU/CM and
DLC-2.
No Replace ABS/TCS HU/CM (communication circuit
malfunction in ABS/TCS HU/CM)
ACTION