Mazda 6. Manual — part 257
P–84
ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)
Diagnostic procedure
STEP
INSPECTION
ACTION
1
VERIFY OTHER DTC HAS BEEN RECORDED
• Have DTCs related to solenoid valve, pump
motor, or pump motor relay been stored?
Yes
Go to applicable DTC inspection.
No
Go to next step.
ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)
P–85
P
2
VERIFY IF CURRENT CONCERNED INPUT
SIGNAL STATUS IS INTERMITTENT OR
CONSTANT
• Turn ignition key to OFF.
• Connect WDS or equivalent to DLC-2.
• Start engine and drive vehicle.
• Access LF_WSPD, LR_WSPD, RF_WSPD
and RR_WSPD using WDS or equivalent.
• Do vehicle speeds correspond approximately
to the four PIDs above?
Yes
Go to Step 8.
No
If there is a difference in speed of four wheels, go to next
step.
If any wheel speed is 0 km/h {0 mph}, go to Step 4.
3
INSPECT WHEEL-SPEED SENSOR OUTPUT
PULSE
• Start engine and drive vehicle.
• Inspect output voltage pattern using an
oscilloscope.
Yes
Go to Step 9.
No
Go to Step 6.
• Is output voltage pattern okay?
4
INSPECT ABS WHEEL-SPEED SENSOR
CIRCUIT FOR SHORT TO GROUND
• Turn ignition key to OFF.
• Disconnect DSC HU/CM and wheel-speed
sensor connectors.
• Inspect continuity between suspected sensor
terminal(s) of DSC HU/CM connector
(harness side) and ground(s).
— RF wheel-speed sensor: M—ground
— LF wheel-speed sensor: F—ground
— RR wheel-speed sensor: K—ground
— LR wheel-speed sensor: Q—ground
• Is there continuity?
Yes
Repair or replace harness for short to ground circuit
between DSC HU/CM and wheel-sped sensor, then go to
Step 9.
No
Go to next step.
5
INSPECT WHEEL-SPEED SENSOR
• Turn ignition key to OFF.
• Disconnect suspected wheel-speed sensor
connector(s) and inspect resistance between
wheel-speed sensor terminal(s) (part side).
• Is resistance within 1.3—1.7 kilohm?
Yes
Go to next step.
No
Replace wheel-speed sensor, then go to Step 9.
6
INSPECT SENSOR ROTOR CLEARANCE
• Jack-up vehicle and support it with safety
stands.
• Remove suspected wheel(s).
• Inspect clearance between wheel-speed
sensor and sensor rotor.
• Is clearance within 0.3—1.1 mm {0.012—
0.043 in}?
Yes
Go to next step.
No
Replace wheel-speed sensor(s), then go to Step 9.
7
INSPECT SENSOR ROTOR FOR DAMAGE
• Jack-up vehicle and support it with safety
stands.
• Remove suspected wheel(s).
• Visually inspect sensor rotor for missing,
deformed and obstructed teeth.
Number of teeth: 44
• Is sensor rotor okay?
Yes
Go to next step.
No
Replace sensor rotor, then go to Step 9.
STEP
INSPECTION
ACTION
P–86
ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)
End Of Sie
DTC C1186, C1266
A6E697367650W14
Caution
• When attaching the tester lead to the DSC HU/CM connector the SST (49 G066 004) must be used.
8
INSPECT DSC HU/CM OPERATION
• Perform DSC HU/CM system inspection.
• See
• Is it okay?
Yes
Go to next step.
No
Replace DSC HU/CM, then go to next step.
9
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory.
• Start engine and drive vehicle at 10 km/h
{6.2 mph} or above.
• Gradually slow down vehicle and stop.
• Is same DTC present?
Yes
Replace DSC HU/CM, then go to next step.
No
Go to next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.
STEP
INSPECTION
ACTION
DTC
C1186, C1266
Fail-safe relay
DETECTION
CONDITION
• C1186:
— Fail-safe relay in DSC HU/CM stuck OFF when ignition switch is turned ON, fail-safe relay ON is
commanded.
• C1266:
— Fail-safe relay in DSC HU/CM stuck ON when ignition switch is turned ON, fail-safe relay OFF is
commanded.
POSSIBLE
CAUSE
• Malfunction of fuse (ABS 60 A)
• Open circuit in harness between DSC HU/CM terminal C and battery positive terminal
• Open or short of fail-safe relay in DSC HU/CM
• Stuck fail-safe relay in DSC HU/CM
ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)
P–87
P
Diagnostic procedure
End Of Sie
DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254, C1400, C1410, C1957, C1958
A6E697367650W15
Diagnostic procedure
STEP
INSPECTION
ACTION
1
INSPECT ABS FUSE CONDITION
• Is ABS fuse (60 A) okay?
Yes
Go to next step.
No
Replace fuse, then go to Step 4.
2
INSPECT FAIL-SAFE RELAY POWER
SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Turn ignition key to OFF.
• Disconnect DSC HU/CM connector.
• Connect SST (adapter harness) to DSC HU/
CM connector (harness side only).
• Turn ignition key to ON (engine OFF).
• Measure voltage between DSC HU/CM
terminal C (harness side) of SST and
ground.
• Is voltage B+?
Yes
Go to next step.
No
Repair or replace harness for open circuit between battery
positive terminal and DSC HU/CM terminal C, then go to
Step 4.
4
VERIFY FAIL-SAFE OPERATION
• Turn ignition key to OFF.
• Remove SST (adapter harness) and connect
all disconnected connectors.
• Connect WDS or equivalent to DLC-2.
• Turn ignition key to ON (engine OFF).
• Access ABS_POWER using WDS or
equivalent.
• Does fail-safe relay operate?
Yes
Go to next step.
No
Replace DSC HU/CM, then go to next step.
5
VERIFY TROUBLESHOOTING COMPLETED
• Clear DTC from memory.
• Is same DTC present?
Yes
Replace DSC HU/CM, then go to next step.
No
Go to next step.
6
VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.
DTC
C 1210
C 1214
C 1194
C 1198
C 1246
C 1254
C 1242
C 1250
C 1400
C 1410
C 1957
C 1958
RF pressure reduction solenoid valve
RF pressure retention solenoid valve
LF pressure reduction solenoid valve
LF pressure retention solenoid valve
RR pressure reduction solenoid valve
RR pressure retention solenoid valve
LR pressure reduction solenoid valve
LR pressure reduction solenoid valve
RF traction switch solenoid valve
LF traction switch solenoid valve
RF DSC switch solenoid valve
LF DSC switch solenoid valve
DETECTION
CONDITION
• Solenoid monitor signal does not track in response to solenoid ON/OFF command.
POSSIBLE
CAUSE
• Stuck solenoid valve in DSC HU/CM
STEP
INSPECTION
ACTION
1
VERIFY SOLENOID VALVE OPERATION
• Turn ignition key to OFF.
• Remove SST (adapter harness) and connect
all disconnected connectors.
• Connect WDS or equivalent to DLC-2.
• Turn ignition key to ON (engine OFF).
• Access solenoid valve(s) PIDs using WDS or
equivalent.
• Does solenoid valve operate?
Yes
Go to next step.
No
Repair DSC HU/CM, then go to next step.
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