Mazda 6 2002, Workshop Manual

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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.
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