Mazda CX-9 Grand Touring 2009 Manual page 476

Disconnect DSC/RSC HU/CM
connector.
Turn the ignition switch to the
ON position (engine off).
2
Measure voltage between
DSC/RSC HU/CM terminal AK
(harness-side) and ground.
Is the voltage B+?
INSPECT PUMP MOTOR
GROUND FOR OPEN CIRCUIT
Turn the ignition switch off.
3
Inspect for continuity between
DSC/RSC HU/CM terminal B
(harness-side) and ground.
Is there continuity?
VERIFY PUMP MOTOR
OPERATION
Turn the ignition switch off.
Connect the M-MDS to the
DLC-2.
4
Turn the ignition switch to the
ON position (engine off).
Access PMP_MOTOR active
command modes using the M-
MDS.
Does the pump motor operate?
VERIFY TROUBLESHOOTING
COMPLETED
Make sure to reconnect all
disconnected connectors.
Clear the DTC from the
memory.
5
(See ON-BOARD
DIAGNOSTIC [DSC/RSC].)
Gradually slow down and stop
the vehicle.
Is the same DTC present?
VERIFY AFTER REPAIR
2008 Mazda CX-9 Grand Touring
2008 BRAKES On-Board Diagnostic (DSC/RSC) - Mazda CX-9
No
Yes Go to the next step.
No
Yes Go to the next step.
No
Replace the DSC/RSC HU/CM, then go to the next
step.
Yes
(See DSC/RSC HU/CM
REMOVAL/INSTALLATION .)
No
Go to the applicable DTC inspection.
Repair or replace the wiring harness for open circuit
between battery positive terminal and DSC/RSC
HU/CM terminal AK, then go to Step 5.
Repair or replace the wiring harness for open circuit
between DSC/RSC HU/CM terminal B and ground,
then go to Step 5.
Replace the DSC/RSC HU/CM, then go to the next
step.
(See DSC/RSC HU/CM
REMOVAL/INSTALLATION .)
Go to the next step.