Code
B1033
MITSUBISHI
B — Body
Pressure sensor open
Views:
UK: 11
EN: 22
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the pressure sensor circuit
- Disconnected, loose or corroded sensor connector/terminals
- Faulty pressure sensor (internal open circuit)
- Blown fuse or missing power/ground to sensor
- Poor grounding at chassis or sensor ground
- Intermittent connector contact due to corrosion or damage
Symptoms
- Related system may not operate correctly or will go into limp/failsafe mode (system-dependent)
- System warning lamp or message may be present
- OEM diagnostic data shows no signal or implausible signal from the pressure sensor
- Intermittent faults if connector is loose or wiring chafes
What to check
- Retrieve freeze-frame and live data with a scan tool and note conditions when the code set
- Inspect sensor connector and wiring for damage, corrosion, melted insulation or pin push-out
- Check relevant fuses and power/ground circuits for the sensor
- Backprobe the sensor connector and observe reference voltage and signal with ignition ON
- Perform continuity check between sensor connector and ECU connector for signal, power, and ground
- Wiggle harness and connectors while monitoring live data to reproduce intermittent faults
Signal parameters
- Typical pressure sensor signal architecture: reference voltage ≈ 5.0 V (from ECU) — verify with service manual
- Typical output voltage varies with pressure (common range ~0.5–4.5 V) — open circuit may read 0 V or diagnostic tool shows no signal
- Open-circuit on resistance check: multimeter may show OL (infinite) between signal pin and expected internal reference
- Continuity: wiring between sensor and ECU signal pin should show low resistance (typically
Diagnostic algorithm
- Connect a capable scan tool, read DTCs and live data. Confirm B1033 and note any related codes or freeze-frame data.
- Visually inspect the sensor, connector, and wiring harness for damage, corrosion, water intrusion, or pin deformation. Repair obvious issues.
- With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (usually ~5 V), ground continuity, and the signal wire status. If reference voltage or ground is missing, trace and repair power/ground circuits.
- Check continuity between sensor signal pin and the ECU pin. Repair any open circuit in the wiring harness (splice or replace harness as required).
- If wiring and power/ground are good but signal is absent or inconsistent, bench-test or substitute a known-good sensor and re-check. Use a pressure/vacuum pump if necessary to confirm sensor output changes with pressure.
- If a replacement sensor cures the issue, install new sensor, clear codes and road-test to verify. If issue remains and wiring checks good, consider ECU input fault and consult manufacturer procedures before replacing ECU.
- After repair, clear codes and confirm no return of B1033 under the same operating conditions.
Likely causes
- Open/broken harness or connector at the pressure sensor
- Corroded/loose sensor connector terminals
- Failed pressure sensor element
Fault status
Status
B1033 — Pressure sensor circuit open (no valid signal detected from pressure sensor). Check sensor wiring, connector, power/ground and the sensor itself.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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