Code
P1150
DAEWOO
P — Powertrain
MANIFOLD PRESSURE SENSOR
Views:
UK: 3
EN: 6
RU: 3
AI status
Completed
Completed
100%
Causes
- Open or shorted MAP sensor signal wire
- Corroded or loose connector pins at the MAP sensor
- Failed or contaminated MAP sensor
- Vacuum leaks or intake manifold leaks affecting MAP reading
- Blown 5V reference or ground circuit fault
- Poor connector/ground at PCM
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality, stalling or rough running
- Hesitation, lack of power or surging under load
- Increased fuel consumption or black smoke
- Hard starting or intermittent no-start
- Possible limp-home mode or reduced engine performance
What to check
- Read and record freeze-frame data and live MAP signal (use scan tool)
- Visual inspection of MAP sensor, vacuum hose and intake manifold for leaks or damage
- Inspect connector for corrosion, bent pins, moisture or loose terminals
- Check for proper 5 V reference at sensor with key ON (using multimeter)
- Check sensor ground continuity to chassis/PCM ground
- Measure MAP sensor signal voltage with engine OFF, at idle and at higher RPM
Signal parameters
- Reference supply: approximately 5.0 V (key ON)
- Ground: near 0 V
- Typical MAP sensor output: ~0.5–4.5 V across operating range (low pressure ≈ low volts, high pressure ≈ high volts)
- At high vacuum (idle): signal typically around 0.5–1.5 V (varies by vehicle and altitude)
- At higher manifold pressure / wide open throttle: signal typically around 3.5–4.5 V
- MAP reading in kPa or inHg should change smoothly with engine load or applied vacuum
Diagnostic algorithm
- Retrieve freeze-frame and live data using a scan tool; note MAP sensor voltage and engine load values.
- Perform a visual inspection: check vacuum hose to sensor (if used), intake for leaks, and connector condition.
- With key ON (engine OFF), verify ~5 V reference at the sensor reference pin and verify sensor ground continuity to chassis/PCM ground.
- Back-probe the MAP signal wire. Verify signal voltage changes when engine is cranked or when vacuum is applied/released using a handheld vacuum pump. Voltage should change smoothly and correlate with vacuum/engine RPM.
- If signal is fixed at 0 V, 5 V, or erratic, inspect wiring for opens/shorts to power/ground and repair as needed. Perform wiggle test to find intermittent breaks.
- If wiring and power/ground are good but signal is out-of-range or non-responsive, replace the MAP sensor and retest.
- After repair, clear codes, perform road test, and recheck for code return and correct sensor behavior.
- If code returns after sensor and wiring repair, consider PCM input circuit testing or replacement by a qualified technician.
Likely causes
- Damaged or disconnected wiring/connector to MAP sensor
- Failed MAP sensor
- Intake manifold vacuum leak or gasket failure
- Corroded connector pins or poor ground
- Less likely: PCM internal fault
Fault status
Status
P1150 indicates the engine control module detected a MAP sensor signal or circuit outside expected parameters (open, short, stuck high/low, or intermittent). This affects air/fuel and ignition calculations. Immediate inspection of wiring, connector, sensor, and intake leaks is recommended. Do not assume final diagnosis without systematic testing.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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