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Home / DTC / B1436 — FL side analog G sensor fail

B1436 — FL side analog G sensor fail

Detailed page for trouble code B1436.

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B1436

MITSUBISHI B — Body

FL side analog G sensor fail

Brand: MITSUBISHI
Type: B — Body
AI status
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ready
Completed 100%
Page language: EN

Causes

  • Faulty front-left analog G sensor (accelerometer)
  • Open, short or high‑resistance wiring between sensor and SRS ECU
  • Poor connector contact, corrosion, bent pins or water ingress at sensor plug
  • Poor or missing sensor ground or reference supply
  • Incorrect sensor mounting or physical damage from impact
  • SRS control module internal fault or firmware issue

Symptoms

  • SRS / airbag warning lamp illuminated
  • Possibly disabled airbag/seatbelt pretensioner function for affected side
  • Related safety systems (e.g., side impact detection) may be inhibited
  • Stored B1436 code and possibly related SRS codes
  • No drivability symptoms (vehicle runs normally) unless other faults present

What to check

  • Retrieve and record all SRS codes and freeze‑frame data with a capable scan tool
  • Visual inspection of the front-left sensor, mounting, and nearby wiring for damage, corrosion or water
  • Inspect and flex wiring harness and connectors while monitoring for code set/revert (wiggle test)
  • Check battery voltage and main SRS power/ground integrity
  • Backprobe sensor connector to measure reference, ground and signal voltages
  • Compare sensor signal (voltage) to expected rest/zero‑g value and to other sensors if available

Signal parameters

  • Sensor type: analog accelerometer (G sensor) output
  • Typical idle/zero‑G signal near mid‑supply (≈2.5 V) — varies by sensor; can range ~0.5–4.5 V
  • Signal changes proportionally with acceleration (+/− V per g depending on sensor)
  • Reference supply usually a regulated 5 V or similar from SRS ECU and a solid ground
  • Expected continuity: low resistance to ground for ground circuit; continuity to ECU for signal/reference

Diagnostic algorithm

  1. Use a manufacturer‑level scan tool to read all SRS codes and freeze frame. Note related codes and history.
  2. Observe safety warning: follow the Mitsubishi SRS service procedure. Disable SRS power (disconnect battery negative) and wait the manufacturer‑specified time before touching sensors or connectors.
  3. Perform visual inspection of the FL sensor, mounting and harness for physical damage, water, or loose fasteners.
  4. With battery reconnected and scan tool attached, backprobe the sensor connector: verify reference voltage, signal voltage (resting), and ground continuity per service manual values.
  5. Wiggle the harness and connectors while monitoring live data / DTCs to detect intermittent faults.
  6. If power/ground present but signal out of range or absent, replace the front‑left G sensor or swap with a known good unit (if possible) and retest.
  7. If sensor replacement does not clear the fault, inspect wiring continuity between sensor and SRS ECU, including for shorts to ground or battery, and check ECU connector pins.
  8. If wiring and sensor are good, consider SRS ECU fault — consult manufacturer guidance for ECU testing or replacement.
  9. After repair, clear codes and perform SRS system check with scan tool. Confirm SRS lamp is off and no new codes return.
  10. If deployment history exists, follow prescribed service actions (replace components, erase data) per Mitsubishi procedures.

Likely causes

  • Damaged sensor or internal sensor electronics
  • Damaged/deteriorated harness or connector at front-left sensor
  • Loose or corroded ground or reference wire
  • Sensor incorrectly seated or mechanically shifted
  • Fault in SRS ECU or connector at ECU

Fault status

⚠️ Status
SRS ECU detected malfunction in front‑left analog G sensor circuit — out‑of‑range or no signal. Airbag system fault stored; SRS warning lamp ON.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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