Code
C1361
MITSUBISHI
C — Chassis
M/C pressure SNSR.stuck/low gain
Views:
UK: 18
EN: 16
RU: 18
AI status
Completed
Completed
100%
Causes
- Faulty M/C (master cylinder) pressure sensor
- Open, shorted or corroded wiring/connector between sensor and ABS ECU
- Poor sensor reference voltage or ground (power supply fault)
- Contaminated or hydraulic system fault causing sensor mechanical binding
- Faulty ABS/traction control ECU or internal circuit failure
- Blown fuse or poor battery/ignition power to control module
Symptoms
- ABS, traction control or brake warning lamp illuminated
- Diagnostic trouble code C1361 stored in ABS/BCM memory
- Reduced/no ABS or traction control operation under braking
- Brake pedal feel may be abnormal under certain conditions
- Possible limp behavior of stability systems
What to check
- Read & record DTCs and freeze-frame data with a capable scan tool
- Check live data: M/C pressure sensor raw value and response to brake input
- Visually inspect sensor connector and harness for corrosion, damage or water ingress
- Verify sensor reference voltage (typically ~5 V) and ground at connector with key ON
- Backprobe sensor output and observe voltage change while applying brake pressure or actuating ABS pump
- Perform continuity and short checks between sensor connector and ABS ECU pins
Signal parameters
- Sensor type: analog pressure sensor (most systems)
- Reference/supply voltage: typically ~5 V (verify with factory manual)
- Expected output voltage range: approximately 0.5 V (low pressure) to 4.5 V (high pressure) — varies by model
- No or minimal output change when pressure is applied indicates stuck/low-gain condition
- Resistance: specific Ohm values depend on sensor design — consult service data
Diagnostic algorithm
- Connect scan tool. Note C1361 plus any related ABS/stability codes and record live M/C pressure sensor PID at rest and while applying the brake.
- Perform visual inspection of sensor, connectors and harness for damage, corrosion, pin loss or water entry. Repair any visible issues and retest.
- With ignition ON (engine off), backprobe sensor connector. Verify sensor reference voltage and ground per service manual. If reference voltage missing or incorrect, trace power/ground to ECU and related fuses/relays.
- Measure sensor output voltage while slowly increasing brake pressure (manual brake pedal or suitable test rig). Confirm output follows expected voltage vs pressure curve. No change or very low amplitude = confirm fault.
- Check continuity between sensor signal pin and ABS ECU signal input; check for shorts to battery (+) or ground. Repair wiring as required.
- If wiring and supply checks are good but sensor output is incorrect, replace the M/C pressure sensor. Use an OEM or equivalent sensor.
- After repair or replacement, clear codes, perform system initialization/calibration if required by manufacturer, and verify with road test and scan-tool live data that values change correctly and code does not return.
- If fault persists after sensor replacement and wiring confirmed good, consider ABS ECU internal fault and proceed with ECU testing/replacement per factory procedures.
Likely causes
- Failed M/C pressure sensor
- Connector corrosion, bent pin, or loose terminal at sensor
- Broken wire or short to ground/12V in harness to ECU
- Loss of sensor reference voltage (faulty power/ground to sensor)
- Hydraulic restriction or seized internal sensor element
Fault status
Status
M/C pressure sensor signal stuck or low gain detected — sensor output is abnormally low or not varying; ABS/traction control may be limited.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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