Code
P1006
DACIA
P — Powertrain
Mass air flow (MAF) sensor - circuit malfunction
AI status
Completed
Completed
100%
Causes
- Damaged or corroded MAF sensor connector or wiring
- Failed MAF sensor (hot-wire or hot-film element)
- Poor power supply or ground to the MAF sensor
- Intake air leaks between MAF and throttle body
- Contaminated or clogged MAF sensor element
- ECU input circuit fault or software/calibration issue
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Poor idle quality, rough running or surging
- Reduced engine power and hesitation on acceleration
- Increased fuel consumption or black exhaust smoke (rich condition)
- Stalling at idle or after warm-up
- Difficulty starting or transient drivability faults
What to check
- Read stored codes and freeze-frame data with a scan tool; note engine conditions when code set
- Visually inspect MAF sensor, connector, and wiring for damage, corrosion, or loose pins
- Inspect intake tract for leaks, cracked hoses, or loose clamps between airbox and throttle body
- Check air filter and airbox for contamination; note any aftermarket components
- Backprobe MAF connector and check reference voltage, ground continuity and signal while key ON and engine running
- Compare live MAF sensor readings (g/s or V) at idle and during throttle changes with expected values or factory data
Signal parameters
- Reference voltage: typically ~5.0 V (verify factory spec) present key ON
- Sensor ground/return: near 0.0 V with good continuity to chassis ground
- Typical signal voltage range: ~0.5–4.5 V depending on airflow (varies by sensor type)
- Typical mass flow reading at idle: vehicle-specific (often small g/s value) — compare to OEM data
- Response: signal should change smoothly with throttle movement; spikes, drops to 0 V, or stuck values indicate fault
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF readings, engine temp, and intake conditions when the code set.
- Visually inspect MAF housing, wiring harness, and connector. Repair or replace damaged wiring or corroded terminals.
- With ignition ON (engine off), verify reference voltage at MAF connector (usually ~5 V) and ground continuity to chassis ground. Replace blown fuse or repair ground if missing.
- Start engine and observe MAF signal (voltage or g/s). Verify the signal moves smoothly with throttle. If signal is 0 V, stuck, or erratic, suspect wiring or sensor.
- Perform a wiggle test on harness and connector while watching live signal to find intermittent faults.
- Unplug MAF and note engine behavior: many engines will run roughly or set different codes; this helps confirm MAF influence but does not replace proper testing.
- Clean the MAF only with approved MAF cleaner if contamination is visible (do not use other solvents). Re-test—cleaning sometimes restores function.
- If wiring and power/ground are good and cleaning didn’t help, substitute a known-good MAF sensor or bench-test the sensor per factory procedure.
- If an aftermarket intake or filter was recently fitted, reinstall OEM plumbing and retest.
- If sensor and wiring pass tests, investigate ECU input circuit or update ECU software with dealer-level equipment.
- After repairs, clear codes and perform road test to confirm fault does not recur and live parameters are within spec.
Likely causes
- Broken/frayed wiring or chafed harness near the airbox
- Connector pins pushed out, bent, or corroded
- MAF sensor contaminated with oil/dirt or physically damaged
- Blown fuse or missing reference voltage/ground at MAF connector
- Cracked intake hose or loose clamp causing unmetered air
- Previous aftermarket intake or air filter that altered airflow characteristics
Fault status
Status
MAF sensor circuit malfunction detected. Inspect MAF sensor, connector and wiring; verify power, ground and signal. Clean or replace sensor as required and check for intake leaks.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email