No.2 Any Of The Following; And/Or Dsc Off Light - Mazda 2002 6 Workshop Manual

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
NO.2 ANY OF THE FOLLOWING LIGHTS STAY ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING
LIGHT, DSC INDICATOR LIGHT AND/OR
Any of the following lights stay on: (ABS warning light, BRAKE system warning light, DSC indicator
2
light and/or DSC OFF light)
[TROUBLESHOOTING HINTS]
• Brake fluid amount is low.
• Parking brake does not release.
• No connection at DSC HU/CM connector
(when DSC HU/CM connector comes off, ABS warning light and BRAKE system warning light illuminate.)
• DSC HU/CM detected malfunction (input and output device malfunction)
• DSC HU/CM detects low voltage in power supply.
• DSC HU/CM ground malfunction
(when DSC HU/CM ground is not securely connected, ABS warning light and BRAKE system warning light
illuminate but diagnostic trouble code does not display)
• DSC HU/CM does not operate (DSC HU/CM malfunction.)
• DSC OFF light circuit shorted in ground (when DSC OFF circuit is shorted in ground, DSC OFF light illuminated.)
• ABS warning light circuit or BRAKE system warning light circuit open
(when the harness is open between DSC HU/CM and each warning light, each warning light illuminates)
Diagnostic procedure
STEP
1 INSPECT BRAKE FLUID AMOUNT AND
VERIFY THAT PARKING BRAKE RELEASES
• Is brake fluid amount normal?
• Is parking brake lever released?
2 CHECK FOR DTCS IN DSC HU/CM
• Check the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been recorded in memory?
3 CHECK TO SEE WHETHER MALFUNCTION
IS IN CONTROL MODULE CONNECTOR,
TERMINAL OR OTHER
• Do ABS warning light and BRAKE system
warning light go off after 4 seconds with
ignition switch on?
4 INSPECT BATTERY
• Is battery voltage normal?
5 INSPECT CHARGING SYSTEM
• Is battery voltage normal with electrical load
(A/C, headlight, etc.) on and engine idling?
6 VERIFY THAT DSC HU/CM CONNECTOR IS
CONNECTED
• Is DSC HU/CM securely connected?
7 VERIFY THAT DSC HU/CM CONNECTOR
TERMINAL OR RELATED CONNECTOR
TERMINALS ARE CONNECTED
• Are DSC HU/CM connector terminal or
instrument cluster connector terminal etc.
related connector terminals securely
connected?
8 INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND DSC HU/CM
FOR CONTINUITY
• Is there continuity between each warning
light terminal of instrument cluster and DSC
HU/CM connector terminal?
9 INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND DSC HU/CM
FOR SHORT IN GROUND
• Is there continuity between each indicator
light terminal of DSC HU/CM and ground?
End Of Sie
OFF LIGHT)
DSC
INSPECTION
Yes Go to next step.
No Add brake fluid or release parking brake lever.
Yes Perform inspection using appropriate DTC.
No Go to next step.
Yes Temporary poor connection in control module connector.
Inspect DSC HU/CM connector, then go to Step 6.
Inspect DSC HU/CM connector terminal, then go to Step 7.
No Go to next step.
Yes Go to next step.
No Inspect battery and charging system.
Yes Go to next step.
No Inspect charging system (drive belt tension, generator, etc.).
Yes Go to next step.
No Connect DSC HU/CM connector securely, then go to next
step.
Yes Go to next step.
No Connect DSC HU/CM connector terminal etc. related
connector terminals securely.
Yes Go to next step.
No Repair malfunctioning part.
Yes Repair malfunctioning part.
No Inspect power supply harness and ground harness of DSC
HU/CM.
If above wiring harness are okay, replace DSC HU/CM.
If above wiring harness are malfunctioning, repair
malfunctioning wiring harness.
A6E699067650W17
ACTION
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