Dtc C1953, C1954 - Mazda 6 2002 Workshop Manual

ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)
DTC C1510, C1511, C1512, C1513
C1510
C1511
DTC
C1512
C1513
DETECTION • Wheel lock is detected during ABS operation (pressure reduction inoperative).
CONDITION • Pressure reduction on a single wheel continues for 20 seconds or more.
• Malfunction of solenoid valve in DSC HU/CM
POSSIBLE • Malfunction of wheel-speed sensor
CAUSE • Damaged sensor rotor
• Stuck pump motor in DSC HU/CM
Diagnostic procedure
STEP
1 VERIFY OTHER DTC HAS BEEN RECORDED
• Has any wheel speed sensor, sensor rotor,
solenoid valve, pump motor, or motor relay
related DTC been output?
2 INSPECT DSC HU/CM OPERATION
• Perform DSC HU/CM system inspection.
See P–35 DSC SYSTEM INSPECTION
• Is it okay?
3 VERIFY CURRENT STATUS OF
MALFUNCTION
• Clear DTC from memory.
See P–46 Clearing DTCs Procedures
• Start engine and drive vehicle at 10 km/h
{6.2 mph} or above at least one minute.
• Gradually slow down and stop vehicle.
• Is same DTC present?
4 VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?

DTC C1953, C1954

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DTC C1953, C1954
• C1953:
— Monitor voltage of the brake fluid pressure sensor is detected at 4.5 V or more, or 0.5 V or less.
— Monitor voltage difference of 0.4 V or more within 1 cycle is detected 8 times in 1 second.
DETECTION • C1954:
CONDITION — Brake fluid pressure sensor 0-point correction value is 0.3 V or less, or 0.9 V or more.
— Output voltage value from brake fluid pressure sensor does not increase above 0.06 V.
— Difference between estimated brake pressure value and output value of brake fluid pressure sensor
POSSIBLE
• Malfunction of brake fluid pressure sensor
CAUSE
Diagnostic procedure
STEP
1 INSPECT BRAKE FLUID PRESSURE
SENSOR
• Inspect PID/DATA in brake fluid pressure
sensor.
• Inspect MCYLIP item using WDS or
equivalent.
• Is pressure value change between 0—22.5
MPa when brake pedal is pressed?
2 VERIFY TROUBLESHOOTING COMPLETED
• Clear DTC from memory.
(See P–46 Clearing DTCs
• Is same DTC present?
3 VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
End Of Sie
P–92
RF solenoid valve, motor or RF wheel-speed sensor/sensor rotor
LF solenoid valve, motor or LF wheel-speed sensor/sensor rotor
RR solenoid valve, motor or RR wheel-speed sensor/sensor rotor
LR solenoid valve, motor or LR wheel-speed sensor/sensor rotor
INSPECTION
Brake fluid pressure sensor
eceeds specification.
INSPECTION
Procedures)
Yes Go to applicable DTC inspection.
No Go to net step.
Yes Go to net step.
No Replace DSC HU/CM, then go to net step.
Yes Replace DSC HU/CM, then go to net step.
No Go to net step.
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
Yes Go to net step.
No Repair DSC HU/CM.
Yes Replace DSC HU/CM, then go to net step.
No Go to net step.
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
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