Code
P1105
DAEWOO
P — Powertrain
AIR FLOW CTRL V/V SNSR - PF
Views:
UK: 3
EN: 3
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty air flow control valve sensor (MAF/flow meter or equivalent)
- Damaged, corroded, or loose sensor connector or wiring (open, short to ground, short to battery)
- Poor ground or missing reference voltage (usually 5 V supply)
- Contaminated or clogged sensor (oil, dirt, or debris on sensing element)
- Intake air leaks / vacuum leaks or restrictions in the intake tract
- Sticking or mechanically failed air flow control valve or actuator
Symptoms
- Check Engine MIL illuminated (P1105 stored)
- Poor idle quality, surging or stalling at idle
- Hesitation, stumbling or loss of power on acceleration
- Reduced fuel economy and increased emissions
- Possible rough running under load or limp-home behavior
What to check
- Retrieve DTC and freeze-frame / live data with a scan tool; note engine conditions when code set
- Visually inspect sensor, connector and wiring for damage, corrosion or contamination
- Verify air filter and intake tract are clean and free of restrictions
- Inspect intake boots and vacuum lines for cracks, splits or loose clamps
- Backprobe sensor connector and check reference voltage (typically 5 V), ground continuity and signal output
- Check sensor output while varying engine speed (observe smooth change in signal)
Signal parameters
- Reference supply: typically 5 V reference from ECM (verify on vehicle)
- Signal output: should vary smoothly with airflow (low at idle, higher with increased rpm/airflow)
- Approximate voltage range often 0.5–4.5 V depending on sensor type (confirm with service manual)
- Check for stable ground and no intermittent open/short in harness
- Compare live sensor data to expected ramp-up with throttle changes
Diagnostic algorithm
- Connect a scan tool, record freeze-frame and live data for airflow sensor while key on/engine running; note when fault sets.
- Visually inspect and secure the sensor connector; disconnect and inspect pins for corrosion, bent pins, or moisture.
- With ignition ON (engine off), backprobe connector: verify 5 V reference (if applicable), good ground, and signal line voltage. Report any missing reference or open ground.
- Start engine and observe signal voltage while slowly increasing rpm. Signal should change smoothly. If stuck or erratic, suspect sensor or wiring.
- Wiggle wiring and connectors while monitoring signal and scan tool for intermittent changes. Repair any intermittent wiring faults.
- Inspect and clean/replace air filter; if sensor is contaminated (oil/dirt), clean per manufacturer procedure or replace sensor if not serviceable.
- Check intake system for leaks or obstructions (pressure/smoke test). Repair leaks and retest.
- If wiring and intake are good but sensor output remains out of spec, replace the airflow control valve sensor per OEM procedure.
- Clear codes and perform a test drive to verify the fault does not return. If code returns after replacement, consider ECM or deeper harness faults and perform guided manufacturer diagnostics.
Likely causes
- Broken/frayed wiring between sensor and ECM or poor connector pins
- Sensor element contaminated by oil or dirt after incorrect cleaning or failed PCV/oil catch can
- Intermittent connector contact due to corrosion or bent pins
- Sensor failed with open circuit or output stuck at fixed voltage
- Intake boot split or loose hose causing erratic readings
Fault status
Status
Air Flow Control Valve Sensor Circuit/Performance Fault — ECM detected invalid or implausible signal from air flow control sensor (P1105).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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