Mazda 6 2002 Workshop Manual page 672

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
4 INSPECT PID/DATA IN ABS/TCS HU/CM
Inspect (BRAKE system warning light) using
WDS or equivalent PID/DATA monitor function.
Is BRAKE_LAMP on after more than 4
seconds with ignition switch on?
5 VERIFY WHETHER MALFUNCTION IS IN
PARKING BRAKE SWITCH OR BRAKE FLUID
LEVEL SENSOR, OR IN SOME OTHER PART
Disconnect the following in order:
1. Parking brake switch connector
2. Brake fluid level sensor connector
Does BRAKE system warning light go out with
ignition switch on?
*
INSPECT WIRING HARNESS BETWEEN ABS/
6
TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR CONTINUITY
Disconnect ABS/TCS HU/CM connector.
Connect the SST ( 49 G066 001) (vehicle
harness side only).
Is there continuity between SST connector
terminal X and data link connector?
*
INSPECT WIRING HARNESS BETWEEN ABS/
7
TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR SHORT TO B+
Is voltage approimately 12 V at SST
connector terminal X?
*
INSPECT WIRING HARNESS BETWEEN ABS/
8
TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR SHORT TO GROUND
Is there continuity between SST connector
terminal X and ground?
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
doing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If
there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly
and undamaged.
End Of Sie
Yes Connect ABS/TCS HU/CM connector terminal X securely,
then go to net step.
No Go to step 6.
Yes Replace parking brake switch and/or brake fluid level sensor
(shorted on some internal part).
No Perform the following inspections. Repair if necessary.
• Short to ground in wiring harness between instrument
cluster ( BRAKE system warning light) and parking
brake switch.
• Short to ground in wiring harness between instrument
cluster (BRAKE system warning light) and brake fluid
level sensor.
Inspect instrument cluster.
Yes Go to net step.
No Repair wiring harness between ABS/TCS HU/CM and data
link connector.
Yes Repair wiring harness between ABS/TCS HU/CM and data
link connector.
No Go to net step.
Yes Repair wiring harness between ABS/TCS HU/CM and data
link connector.
No Replace ABS/TCS HU/CM (communication circuit
malfunction in ABS/TCS HU/CM).
P
P–115