Code
C1363
MITSUBISHI
C — Chassis
M/C pressure SNSR.high voltage
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UK: 15
EN: 18
RU: 18
AI status
Completed
Completed
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Causes
- Short to battery (signal wire connected to +12V)
- Open or high-resistance ground or reference circuit
- Damaged/corroded connector or wiring harness (shorts, chafing, water ingress)
- Faulty master cylinder pressure sensor
- Faulty ABS/BCM/ECU input or internal circuitry
- Incorrect replacement sensor or installation error
Symptoms
- ABS, brake or ESC/traction warning lamp illuminated
- Possible loss/limitation of ABS or electronic brake assist functions
- Brake system faults logged in ECU memory; limp/limited driving modes may be active
- Intermittent or constant fault code C1363 present
- In rare cases, change in brake pedal feel (if pressure sensor used for brake assist control)
What to check
- Use a diagnostic scanner to read/record freeze-frame data, stored codes and live sensor values
- Visually inspect the sensor connector and wiring harness at the master cylinder for corrosion, pin damage, or water intrusion
- With ignition on (engine off), backprobe sensor connector and measure reference, signal and ground voltages with a DVM
- Check for continuity and shorts: signal wire to battery (+) and to ground
- Wiggle test wiring while watching live data for intermittent changes
- Check related fuses and ECU grounds/power pins for proper voltage
Signal parameters
- Typical reference voltage to sensor: ~5.0 V (may be 4.5–5.0 V depending on vehicle)
- Expected sensor signal range: roughly 0.5–4.5 V proportional to pressure (manufacturer-specific)
- High-voltage fault often triggered when signal > ~4.7–5.0 V or near battery voltage
- Sensor impedance: varies by design (typically low kΩ range); consult service manual for exact values
Diagnostic algorithm
- Safety first: park on level ground, engine off, key off. Follow shop safety rules when working near brake components.
- Connect qualified OBD-II/ABS scanner. Record freeze-frame and live data for M/C pressure sensor and related channels. Note voltage value flagged as high.
- Visually inspect sensor, connector and wiring for damage, corrosion or water. Repair obvious physical damage.
- With ignition ON (engine OFF), backprobe connector: verify reference voltage (~5V) from ECU, check sensor ground, and measure sensor signal voltage. If signal equals battery voltage or reference, suspect short to B+ or internal sensor fault.
- If signal is high and reference/ground are good, disconnect the sensor and re-check signal wire voltage at the harness side. If voltage returns to normal (open-circuit), the sensor is likely shorted internally. If still high, suspect short in vehicle wiring or ECU.
- Perform continuity and short-to-power/ground checks on the signal wire (harness). Repair any short or chafing found.
- If wiring and connector are good, replace the master cylinder pressure sensor with correct OEM/approved part.
- After repair, clear codes, perform self-tests and road test. Re-scan to confirm C1363 does not return.
- If fault persists after sensor and wiring verified/replaced, inspect ECU ABS module inputs and grounds; consider module diagnostics or replacement by specialist.
- Document repairs and recheck all brake-related functions before returning the vehicle to service.
Likely causes
- Shorted signal wire to battery (+12V)
- Failed pressure sensor (internal electronics saturated)
- Poor ground or 5V reference supply from ECU
- Corroded/loose connector at sensor allowing intermittent high readings
- ECU input failure (less likely)
Fault status
Status
Master cylinder pressure sensor signal voltage higher than expected (high voltage). Suspect short to battery, sensor failure, poor ground, wiring/connector fault, or ECU input problem.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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