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Home / DTC / P0101 — AFS range

P0101 — AFS range

Detailed page for trouble code P0101.

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Code

P0101

MITSUBISHI P — Powertrain

AFS range

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Contaminated or dirty air flow (MAF/AFS) sensor
  • Faulty AFS/MAF sensor
  • Wiring problems: open, short to ground, or short to voltage in sensor circuit
  • Poor or intermittent connector contact (corrosion, bent pins)
  • Intake air leaks (between MAF and intake manifold) or vacuum leaks
  • Blocked or severely dirty air filter or intake tract restriction

Symptoms

  • Check Engine Light (MIL) illuminated
  • Poor idle quality, stalling or rough running
  • Hesitation or lack of power under acceleration
  • Reduced fuel economy
  • Black exhaust smoke or rich running
  • Surging or unstable engine speed

What to check

  • Read freeze-frame and live data (MAF raw value, mass airflow g/s or lb/min, RPM, long/short-term fuel trim)
  • Clear codes and confirm repeatability with test drive and live-data monitoring
  • Visual inspection of MAF sensor and inlet tract for contamination, damage or obstructions
  • Inspect air filter and intake piping for restrictions and proper seating
  • Check connector pins for corrosion, bent pins and secure fit
  • Perform wiring continuity/resistance checks between MAF and ECM and check for shorts to battery or ground

Signal parameters

  • Typical MAF analog output: approximately 0.5–4.5 V proportional to airflow (varies by design).
  • At idle: often in the lower range (~0.5–1.5 V) depending on engine and sensor.
  • At higher load/engine speed: voltage should rise smoothly toward ~4–4.5 V near high airflow.
  • Some MAFs use frequency/pulse output: frequency increases with airflow (typical range 0–2 kHz depending on design).
  • Live-data expected correlation: MAF value should increase steadily with RPM and throttle opening and match expected g/s or lb/min for engine displacement and RPM.

Diagnostic algorithm

  1. Retrieve DTC(s) and freeze-frame data; note engine conditions when fault set.
  2. Inspect air filter, intake tubing, and MAF housing for contamination or obstructions; clean or replace air filter if dirty.
  3. Visually inspect MAF sensor and connector; unplug and inspect pins for damage or corrosion.
  4. With key on engine off, verify MAF sensor supply voltage and ground at connector (reference vehicle wiring diagrams for pinout).
  5. Measure MAF signal with a multimeter or oscilloscope while cranking/running; confirm smooth, proportional change with throttle. Compare to expected ranges/specs.
  6. Monitor live data (MAF g/s or kg/h, RPM, TPS, fuel trims). Look for unrealistic MAF reading (very low/high) or mismatch with RPM and TPS (e.g., high TP but low MAF indicates possible sensor fault or inlet leak).
  7. Perform a smoke test to detect intake leaks between MAF and intake manifold (including PCV, EGR, vacuum lines).
  8. If contamination suspected, attempt approved MAF cleaning procedure (use specified MAF cleaner; do not touch sensing element). Re-test.
  9. If wiring or connector faults identified, repair wiring and re-test. Check for intermittent faults by wiggling harness while monitoring live data.
  10. If results remain out of spec, substitute a known-good MAF or bench-test the sensor per manufacturer specification to confirm failure.
  11. After repair, clear codes and road-test to verify DTC does not return and drivability is restored.

Likely causes

  • MAF sensor contamination (oil, dust, grease)
  • Damaged wiring or connector to MAF
  • Intake leak downstream of the MAF (vacuum leak)
  • Failed MAF element or hot-wire broken
  • Aftermarket air filter oil contamination

Fault status

⚠️ Status
Mass Air Flow (AFS/MAF) Circuit — Range/Performance. Sensor output not matching expected airflow for operating conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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406

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