Mazda 6. Manual — part 261
P–100
TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
*
1 : DTC U2021 for past malfunction is not recorded in the ABS/TCS HU/CM. DTC U2021 for present malfunction
displayed, but goes out when engine coolant temperature rises above 0
°C {32F}.
*
2 : When malfunctions happen that display DTCs, flashes the ABS warning light.
2. Precautions during servicing of ABS/TCS
The ABS/TCS is composed of electrical and mechanical parts.It is necessary to categorize malfunctions as
being either electrical or hydraulic when performing troubleshooting.
(1) Malfunction in electrical system
• The ABS/TCS hydraulic unit and control module (ABS/TCS HU/CM) has an on-board diagnostic
function. With this function, the ABS warning light and/or BRAKE system warning light will come on
when there is a problem in the electrical system. Also, past and present malfunctions are recorded in
the ABS/TCS HU/CM. This function can find malfunctions that do not occur during periodic inspections.
Connect the WDS or equivalent to the DLC-2. The stored malfunction will be displayed in the order of
occurrence. To find out the causes of ABS/TCS malfunction, use these on-board diagnostic results.
• If malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection of
the harness. The ABS/TCS HU/CM usually operates normally. Be careful when searching for the cause
of malfunction.
• After repair, it is necessary to clear the
DTC from the ABS/TCS HU/CM memory. Also, if the ABS/TCS related parts have been replaced, verify
that the no DTC has been displayed after repairs.
• After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the ABS CM (ABS
motor or ABS motor relay or solenoid valve), the ABS warning light may not go off (
*
) even when the
ignition switch is turned on. In this case, drive the vehicle at a speed of more than 10km/h{6.2mph},
make sure that ABS warning light goes off, and then clear the DTC.
* The BRAKE system warning light also illuminates when any rear wheel malformations.
• When repairing, if the ABS/TCS related connectors are disconnected and the ignition switch is turned
on, the ABS/TCS CM will mistakenly detect a fault and record it as a malfunction.
• To protect the ABS/TCS HU/CM, make sure the ignition is off before connecting or disconnecting the
ABS/TCS CM connector.
• To protect the terminal, use the SST (ABS/TCS: 49 G066 001, DSC: 49 G066 004) when connecting
the tester lead to the ABS/TCS HU/CM connector.
(2) Malfunction in hydraulic system
• Symptom in hydraulic system malfunction are similar to those in conventional brake malfunction.
However, it is necessary to determine if the malfunction is in an ABS component or the conventional
brake system.
• The ABS hydraulic unit contains delicate mechanical parts. If foreign materials get into the component,
the ABS may fail to operate. Also, it will likely become extremely difficult to find the location of the
malfunction in the event that the brakes operate but the ABS does not. Make sure foreign materials do
not get inside when servicing the ABS (e.g. brake fluid replacement, pipe removal).
Warning lights that may
illuminate and/or flash
Cases in which the light may
illuminate
Conditions in which the
light will go out
ABS, EBD, TCS and DSC
control
All the following lights
illuminate:
• TCS OFF light
When the engine coolant
temperature is below
0
°C {32 F}.(
*2
)
When engine is started and
engine coolant temperature
rises above 0
°C {32 F}.)
ABS: Cuts control.
EBD: Cuts control.
TCS:
1. If TCS is operating, cuts
control after gradually
released TCS control
value.
2. If TCS is not operating,
cuts control.
All the following lights flash:
• ABS warning light
• BRAKE system warning
light
Following light illuminates:
• TCS OFF light
When confirming DTC,PID/
DATA and ACTIVE COMAND
MODES item using WDS or
equivalent.
When ABS ON-BOARD
DIAGNOSTIC SYSTEM is
released.
ABS: Cuts control.
EBD: Cuts control.
TCS: Cuts control.
TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
P–101
P
Vehicle with DSC
1. The ABS warning light and/or BRAKE system warning light and/or DSC indicator light and/or TSC OFF light
illuminate even when the system is normal.
2. Precautions during servicing of DSC The DSC is composed of electrical and mechanical parts. It is necessary
to categorize malfunctions as being either electrical or hydraulic when performing troubleshooting.
(1) Malfunction in electrical system
• The control module has an on-board diagnostic function. With this function, the ABS warning light and/
or BRAKE system warning light and/or DSC indicator light and/or TSC OFF light will come on when
there is a problem in the electrical system.
Also, past and present malfunction are recorded in the control module. This function can find
malfunction that do not occur during periodic inspections. Connect the WDS or equivalent to the DLC-2.
The stored malfunction will be displayed in the order of occurrence. To find out the causes of DSC
malfunction, use these on-board diagnostic results.
• If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection
of the harness.
The control module usually operates normally. Be careful when searching for the cause of malfunction.
• After repair, it is necessary to clear the DTC from the control module memory.
Also, if the DSC related parts have been replaced, verify that the no DTC has been displayed after
repairs.
• After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the control module,
the ABS warning light may not go off even when the ignition switch is turned on. In this case, drive the
vehicle at a speed of more than 10 km/h {6.2 mph}, make sure the ABS warning light goes off, and
then clear the DTC.
• When repairing, if the DSC related connectors are disconnected and the ignition switch is turned on,
the control module will mistakenly detect a fault and record it as malfunction.
Caution
• In DSC vehicles, when any DSC HU/CM, steering angle sensor, lateral-G sensor, yaw rate sensor
are replaced. Perform the sensor standard point installation of each sensor.
• To protect the control module, make sure the ignition is off before connecting or disconnecting the
control module connector.
• To protect the terminal, use the SST (ABS/TCS: 49 G066 001, DSC: 49 G066 004) when connecting
the tester lead to the DSC HU connector.
Warning lights that may
illuminate and/or flash
Cases in which the light may
illuminate
Conditions in which the
light will go out
ABS, EBD, TCS and DSC
control
• ABS warning light
• BRAKE system warning
light
• DSC indicator light
• DSC OFF light
Under any of the following
conditions:
• When the front wheels are
jacked up, struck, or
placed on a chassis roller,
and only the front wheel
ABS wheel speed sensors
are spun for more than 60
senconds.
After turning ignition switch
OFF, vehicle is driven at
speed greater than 10 km/h
{6.2MPH} and normal
operation is confirmed.
• ABS: Cuts control.
• EBD: Cuts control.
• TCS: Cuts control.
• DSC: Cuts control.
Parking brake is not fully
released while driving.
Brake drag.
Sudden
acceleration/deceleration.
Left/right or front/rear tires are
different. (Size, radius, tire
pressure, or wear is other than
that listed on tire label.)
Battery voltage at DSC HU/
CM ignition terminal drops
below about 9.5 V.
Battery voltage rises above
about 9.5 V.
ABS: Operates control.
EBD: Operates control.
TCS: Operates control.
DSC: Operates control.
• Brake system warning
light
• DSC indicator light
• TSC OFF light
Brake fluid amount is low.
Brake fluid level lower than
recommended amount.
ABS: Operates control.
EBD: Operates control.
TCS: Cuts control.
DSC: Cuts control.
P–102
TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
(2) Malfunction in hydraulic system
• Symptom in hydraulic system malfunction are similar to those in a conventional brake malfunction.
However, it is necessary to determine if the malfunction is in a DSC component or the conventional
brake system.
• The hydraulic unit contains delicate mechanical parts. If foreign materials get into the component, the
DSC may fail to operate. Also, it will likely become extremely difficult to find the location of the
malfunction in the event that the brakes operate but the DSC does not. Make sure foreign materials do
not get inside when servicing the DSC (e.g.brake fluid replacement, pipe removal).
Intermittent Concern Troubleshooting
Vibration method
• If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the
steps below.
Note
• There are several reasons why vehicle or engine vibration could cause an electrical malfunction. Check
the following:
— Connectors not fully seated.
— Wire harnesses not having full play.
— Wires laying across brackets or moving parts.
— Wires routed too close to hot parts.
• An improperly routed, improperly clamped, or loose harness can cause wiring to become pinched
between parts.
• The connector joints, points of vibration, and places where wire harnesses pass through the firewall, body
panels, etc. are the major areas to be checked.
Inspection method for switch connectors or wires
1. Connect WDS or equivalent to DLC-2.
2. Turn ignition key to ON (Engine OFF).
Note
• If engine starts and runs, perform the following steps at idle.
3. Access PIDs for the switch you are inspecting.
4. Turn switch on manually.
5. Shake each connector or wire harness a bit
vertically and horizontally while monitoring the
PID.
• If PID value is unstable, check for poor
connection.
Inspection method for sensor connectors or wires
1. Connect WDS or equivalent to DLC-2.
2. Turn ignition key to ON (Engine OFF).
Note
• If engine starts and runs, perform the following steps at idle.
3. Access PIDs for the switch you are inspecting.
YDE6980W003
TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
P–103
P
4. Shake each connector or wire harness a bit
vertically and horizontally while monitoring the
PID.
• If PID value is unstable, check for poor
connection.
Inspection method for sensors
1. Connect WDS or equivalent to DLC-2.
2. Turn ignition key to ON (Engine OFF).
Note
• If engine starts and runs, perform the following steps at idle.
3. Access PIDs for the switch you are inspecting.
4. Vibrate the sensor slightly with your finger.
• If PID value is unstable or malfunction occurs, check for poor connection and/or poorly mounted sensor.
Malfunction data monitor method
1. Perform malfunction reappearance test according to malfunction reappearance mode and malfunction data
monitor. The malfunction cause is found in the malfunction data.
Malfunction data monitor using SST (ABS/TCS: 49 G066 001, DSC: 49 G066 004)
Connector terminal check method
1. Check the connection condition of each female terminal.
2. Insert male terminal; fit female terminal size to
female terminal and check to see whether
malfunction is in female terminal or not.
End Of Sie
YDE6980W002
A6E6921W016
Y3E6980W001
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