Mazda 2002 6 Workshop Manual page 714

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
Diagnostic procedure
STEP
1 CHECK FOR DTCS IN DSC HU/CM
• Check the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been recorded in memory?
2 CHECK TO SEE WHETHER MALFUNCTION
IS IN INSTRUMENT CLUSTER SYSTEM OR
OTHER SYSTEM
• Do other warning and indicator lights
illuminate when IG switch is turned ON?
3 VERIFY THAT DSC HU/CM CONNECTOR IS
CONNECTED
• Is DSC HU/CM securely connected?
4 VERIFY THAT DSC HU/CM CONNECTOR
TERMINAL OR RELATED CONNECTOR
TERMINALS ARE CONNECTED
• Are DSC HU/CM connector terminal, or
instrument cluster connector terminal, or
related connector terminals securely
connected?
5 CHECK TO SEE WHETHER MALUNCTION IS
IN DSC INDICATOR LIGHT AND TCS OFF
LIGHT OR ABS WARNING LIGHT AND
BRAKE SYSTEM WARNING LIGHT
• If DSC indicator light and TCS OFF light do
not illuminate, go to Step 6.
• If ABS warning light and BRAKE system
warning light do not illuminate, go to Step 8.
6 CHECK TO SEE WHETHER MALFUNCTION
IS IN DSC HU/CM OR OTHER
• Disconnect DSC HU/CM.
• Connect the DSC indicator light terminal and
DSC OFF light terminal to body ground.
• Do both indicator lights illuminate with
ignition switch on?
7 INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND DSC HU/CM
FOR CONTINUITY
• Is there continuity between each indicator
light terminals of instrument cluster and DSC
HU/CM connector terminal?
8 CHECK TO SEE WHETHER MALFUNCTION
IS IN DSC HU/CM OR OTHER
• Disconnect DSC HU/CM and turn ignition
switch on.
• Do ABS warning light and BRAKE system
warning lights illuminate with ignition switch
on?
(If above lights illuminate, both lights circuits
are normal.)
9 INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND DSC HU/CM
FOR SHORT
• Is there continuity between each warning
light terminal of DSC HU/CM and ground?
End Of Sie
P–118
INSPECTION
Yes Perform inspection using appropriate DTC.
No Go to next step.
Yes Go to next step.
No Inspect or repair instrument cluster (power supply system,
ground system).
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 terminal securely.
- -
Yes Replace DSC HU/CM (open in DSC HU/CM).
No Go to next step.
Yes Inspect or repair indicator light circuit in instrument cluster.
No Repair malfunctioning part.
Yes Replace DSC HU/CM (short in DSC HU/CM).
No Go to next step.
Yes Repair malfunctioning part.
No Inspect or repair warning light circuit in instrument cluster.
ACTION