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DTC C1288, C1290, C1440, C1730, C1954

BHE040243000W28

DTC | C1288, C1290, C1440, C1730, C1954 | Brake fluid pressure sensor
DETECTION CONDITION | • C1288 – The pressure from the brake fluid pressure sensor when the system starts up is not within specification. • C1290 – The pressure from the brake fluid pressure sensor when not braking exceeds specification. • C1440 – The difference between the estimated brake fluid pressure response calculated by each sensor and the brake fluid pressure response from the brake fluid pressure sensor is not within specification. • C1730 – The voltage to the brake fluid pressure sensor is not within specification. • C1954 – The output voltage from the brake fluid pressure sensor is not within specification.
POSSIBLE CAUSE | • Open or short circuit in the wiring harness between DSC HU/CM terminal B and brake fluid pressure sensor terminal B • Open or short circuit in the wiring harness between DSC HU/CM terminal C and brake fluid pressure sensor terminal C • Open circuit in the wiring harness between DSC HU/CM terminal E and brake fluid pressure sensor terminal A • Malfunction in the brake fluid pressure sensor • Poor connection at connectors (female terminal)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT BRAKE FLUID PRESSURE SENSOR POWER SUPPLY FOR OPEN CIRCUIT • Turn the ignition switch to the ON position (engine off). • Measure the voltage between brake fluid pressure sensor terminal C (harness-side) and ground. • Is the voltage 4.75-5.25 V? | Yes | Go to the next step.
No | Repair or replace the wiring harness for open circuit between brake fluid pressure sensor terminal C and DSC HU/CM terminal C, then go to Step 6.
2 | INSPECT BRAKE FLUID PRESSURE SENSOR GROUND FOR OPEN CIRCUIT • Turn the ignition switch off. • Disconnect DSC HU/CM and brake fluid pressure sensor connectors. • Inspect for continuity between DSC HU/CM terminal E (harness-side) and brake fluid pressure sensor terminal A (harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for open circuit between DSC HU/CM terminal E and brake fluid pressure sensor terminal A, then go to Step 6.
3 | INSPECT BRAKE FLUID PRESSURE SENSOR SIGNAL FOR OPEN CIRCUIT • Inspect for continuity between DSC HU/CM terminal B (harness-side) and brake fluid pressure sensor terminal B (harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for open circuit between DSC HU/CM terminal B and brake fluid pressure sensor terminal B, then go to Step 6.
4 | INSPECT BRAKE FLUID PRESSURE SENSOR SIGNAL FOR SHORT TO GROUND • Turn the ignition switch off. • Inspect for continuity between DSC HU/CM terminal B (harness-side) and ground. • Is there continuity? | Yes | Repair or replace the wiring harness for short to ground between DSC HU/CM terminal B and brake fluid pressure sensor terminal B, then go to Step 6.
No | Go to the next step.
5 | INSPECT BRAKE FLUID PRESSURE SENSOR • Inspect the brake fluid pressure sensor. (See BRAKE FLUID PRESSURE SENSOR INSPECTION.) • Is the brake fluid pressure sensor normal? | Yes | Go to the next step.
No | Replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
6 | VERIFY DTC TROUBLESHOOTING COMPLETED • Clear the DTC from the memory. (See Clearing DTCs Procedures.) • Are the same DTCs present? | Yes | Replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
No | Go to the next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Are any other DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.