Mazda RX-8 Workshop Manual page 1649

Diagnostic procedure
STEP
INSPECT ABS/DSC FUSE CONDITION
1
Is the ABS/DSC 40A fuse normal?
INSPECT MOTOR RELAY POWER SUPPLY FOR
2
OPEN CIRCUIT
Turn the ignition switch off.
Disconnect DSC HU/CM connector.
Turn the ignition switch to the ON
position (engine off).
Measure voltage between DSC
HU/CM terminal B (harness-side)
and ground.
Is the voltage B+?
INSPECT PUMP MOTOR GROUND FOR OPEN
3
CIRCUIT
Turn the ignition switch off.
Inspect for continuity between
DSC HU/CM terminal A (harness-
side) and ground.
Is there continuity?
VERIFY PUMP MOTOR OPERATION
4
Turn the ignition switch off.
INSPECTION
YesGo to the next step.
No Replace the fuse, then go to Step 5.
YesGo to the next step.
No Repair or replace the wiring harness for open circuit between
battery positive terminal and DSC HU/CM terminal B, then go to
Step 5.
YesGo to the next step.
No Repair or replace the wiring harness for open circuit between DSC
HU/CM terminal A and ground, then go to Step 5.
YesGo to the next step.
ACTION