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Home / DTC / P1107 — Dual Alternator Lower Circuit Malfunction Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

P1107 — Dual Alternator Lower Circuit Malfunction Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

Detailed page for trouble code P1107.

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Code

P1107

LINCOLN P — Powertrain

Dual Alternator Lower Circuit Malfunction Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

Brand: LINCOLN
Type: P — Powertrain
Views: UK: 36 EN: 57 RU: 42
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Page language: EN

Causes

  • Faulty MAP sensor
  • Damaged or corroded MAP sensor connector or wiring (intermittent short to ground or open)
  • Poor sensor or engine ground
  • Low battery or failing alternator/regulator (intermittent low system voltage)
  • Poor or intermittent 5V reference supply from ECM
  • Blown fuse or bad relay supplying MAP sensor/PCM power

Symptoms

  • Check Engine Light (MIL) illuminated, stored P1107
  • Intermittent rough idle, stalling, or hesitation
  • Reduced engine power or limp-home mode during diagnosis
  • Poor fuel economy or increased emissions
  • Possible hard starting if voltage is very low
  • Erratic MAP/engine load readings in live data

What to check

  • Read freeze frame and stored data with a scan tool; record MAP voltage and battery/system voltage at fault time
  • Inspect battery terminals and ground straps for tightness and corrosion; measure battery resting voltage
  • Perform charging system test (alternator output and regulator behavior) with engine running and under load
  • Visually inspect MAP sensor connector, pins and wiring harness for damage, corrosion, or water intrusion
  • Backprobe MAP sensor signal, 5V reference and ground while engine is running and during key-on to observe voltage ranges
  • Wiggle test wiring harness and connectors while monitoring live MAP voltage to reproduce intermittent condition

Signal parameters

  • MAP sensor is a low-voltage analog signal (typical 0–5 V range). Exact polarity (higher voltage at high pressure or low pressure) is model-specific — consult wiring data.
  • Typical expected: 0.5–4.5 V usable range; many MAP sensors report ~4.0–4.5 V at key-on/engine off (atmospheric) and ~1.0–2.5 V at idle (engine vacuum) — verify with service manual.
  • Reference supply: stable ~5.0 V reference from ECM; MAP sensor ground should be near 0 V.
  • Battery/charging system should be ~12.6 V (key off) and ~13.5–14.8 V running; transient drops below ~11 V can cause sensor/ECM errors.

Diagnostic algorithm

  1. Verify code and record freeze frame / PID data. Note battery/charging voltage when code set.
  2. Inspect MAP sensor harness and connector for damage, loose pins, corrosion, or water. Repair any obvious faults.
  3. With a quality scan tool, monitor MAP voltage, 5V reference and sensor ground. Observe while key on, engine off, and engine running. Look for intermittent drops or noise.
  4. Check battery voltage at the battery and at the PCM/MAP connector while wiggling harness. If voltage drops occur, isolate wiring fault.
  5. Test charging system: measure alternator output at idle and under load; check for regulator intermittence or a failing alternator that allows temporary low system voltage.
  6. Perform a voltage drop test on MAP ground circuit back to battery negative to ensure a solid ground.
  7. If wiring and charging system check good, substitute a known-good MAP sensor or bench-test the sensor per manufacturer procedure.
  8. If problem persists and wiring and sensor are good, inspect PCM power/ground circuits and pins; consult wiring diagrams and consider PCM connector repair or replacement only after other causes eliminated.
  9. Clear codes and road-test while monitoring live data; if intermittent returns, use oscilloscope to capture transient voltage events on the MAP signal and reference circuits.
  10. After repair, confirm code does not return and verify normal MAP behavior and fuel/idle performance.

Likely causes

  • Corroded/damaged MAP harness connector or pin causing intermittent low voltage
  • Weak/loose battery connection or alternator output causing transient low system voltage
  • Intermittent short of the MAP signal wire to ground (or to a low source) when harness is moved
  • Failed MAP sensor internal circuitry
  • Poor PCM ground or damaged PCM connector pin

Fault status

⚠️ Status
Intermittent low voltage detected on the MAP sensor lower circuit (P1107). May be caused by wiring/connector problem, MAP sensor failure, or intermittent low system/charging voltage.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2.0-4.0 hours

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166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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