Code
P1107
DAEWOO
P — Powertrain
AIR FLOW CTRL V/V SNSR-HI INPUT
AI status
Completed
Completed
100%
Causes
- Short to battery (voltage feed) on the sensor signal wire
- Faulty air flow control valve position sensor (open/shorted electronics)
- Corroded, loose or damaged connector pins
- Damaged harness (chafing, pinched wire, melted insulation)
- Poor or missing ground at sensor
- ECM/PCM input circuit failure (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine performance or limp-in mode on some systems
- Rough idle, hesitation or poor throttle response
- Increased fuel consumption and emissions
- Possible stalling or unstable idle
- Stored trouble code(s) related to air flow or intake control
What to check
- Retrieve freeze frame and all stored codes; note related air/fuel/intake codes
- Visually inspect sensor, connector and wiring for damage, corrosion, looseness or water intrusion
- Check for aftermarket taps or recent repairs near the sensor harness
- With key ON (engine off) measure sensor reference and signal voltages at the connector
- Perform wiggle test on wiring while monitoring signal for intermittent changes
- Backprobe ground to confirm low resistance to chassis ground
Signal parameters
- Sensor uses ECM reference (typically ~5 V) and a ground; signal is a low-voltage analog or position voltage
- Expected normal output: approximately 0.2–4.5 V depending on valve position and design (vehicle-specific)
- High input condition: signal voltage above ~4.5 V (often near battery voltage indicates short to +12V)
- Reference supply should be ~5 V (key ON); ground near 0 V
- Open-circuit or intermittent wiring may cause floating/high readings or no valid signal
Diagnostic algorithm
- Record freeze frame and all stored codes. Note operating conditions.
- Visually inspect sensor, connector, and harness for damage, corrosion, melted insulation or aftermarket splices.
- With ignition ON (engine OFF), backprobe sensor connector: verify reference voltage (~5 V), signal voltage (should be within expected range), and ground continuity to chassis.
- If signal is high (>4.5 V or near battery), disconnect sensor: if voltage at harness remains high, suspect wiring short to battery or ECM fault. If voltage drops to zero or expected level with sensor disconnected, suspect faulty sensor.
- Wiggle harness and connectors while monitoring live data/voltage to find intermittent faults.
- If wiring appears good, bench-test or replace sensor with known-good unit and re-check circuit.
- Repair any shorted/damaged wiring, clean/replace corroded connectors, and ensure good grounds.
- If after replacing sensor and repairing wiring the fault remains and harness checks out, consider ECM input circuit diagnosis or replacement per manufacturer procedures.
- Clear codes and verify repair by running vehicle through the same operating conditions that set the code.
Likely causes
- Sensor signal wire shorted to ignition 12V or to a constant +12V source
- Failed air flow control valve position sensor producing high output
- Contaminated/corroded sensor connector causing intermittent high reading
- Open or high-resistance ground causing floating/high voltage on signal
- Damaged wiring where wire contacts a powered circuit
Fault status
Status
P1107 — Air Flow Control Valve Sensor High Input: sensor signal voltage above expected range (possible short to +12V, sensor or wiring fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for DAEWOO
75
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