Code
P1106
MINI
P — Powertrain
Manifold absolute pressure (MAP) sensor - signal too low at engine stop
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AI status
Completed
Completed
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Causes
- Faulty MAP sensor
- Open or shorted wiring (sensor signal, 5V reference or ground)
- Corroded or loose connector pins
- Blocked, disconnected or leaking intake vacuum/pressure hose to the sensor
- Intake manifold pressure abnormally low (mechanical or sealing issue)
- Intermittent ECU/PCM input fault or poor ECU ground
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (code stored)
- Code P1106 logged at engine stop / shutdown
- Often no immediate drivability effect while driving
- Possible rough idle, hard start, or poor fuel trim if MAP fault is present during operation
What to check
- Read freeze frame and live data with a scan tool; note MAP voltage/pressure at engine stop and during key-on/engine-running
- Visual inspection of MAP sensor, connector, and wiring for damage, corrosion, or loose pins
- Backprobe MAP sensor connector: verify 5 V reference, ground, and signal circuits
- Inspect vacuum/pressure hose from intake to sensor for blockage, kinks or disconnection
- Wiggle-test wiring and observe live data for intermittent changes
- Check for related codes (P0105-P0109 family) that clarify circuit vs performance issues
Signal parameters
- Verify 5 V reference present at sensor with ignition ON (approx. 5 V, per service manual)
- Sensor ground/return continuity to chassis/ECU ground
- MAP signal voltage should change with pressure; many MAP sensors operate roughly within 0.5–4.5 V range (consult MINI service data for exact values)
- At atmospheric pressure (engine off, intake open) expect sensor pressure reading near ambient (~100–110 kPa or ~14.7 psi) or corresponding voltage per manufacturer spec
- Compare live MAP kPa/V values against MINI-specific expected shutdown values
Diagnostic algorithm
- Connect a capable scan tool. Record freeze frame, readiness, and live MAP data. Note the signal at engine stop and during key ON/run.
- Visually inspect sensor, connector and vacuum hose. Repair any obvious damage before further testing.
- With ignition ON (engine OFF), backprobe connector: verify 5 V reference, sensor ground, and that signal wire has expected voltage. If 5 V or ground missing, trace wiring to ECU.
- With engine OFF and intake exposed to atmosphere (or per service procedure), confirm MAP reading is near ambient pressure. If signal low, try gently blowing into the hose (or apply known pressure) and watch response.
- Perform wiggle/strain test on harness while observing live data to find intermittent shorts/opens.
- If wiring and power/ground are good but signal remains low or unresponsive, substitute a known-good MAP sensor or bench-test the sensor per MINI procedures.
- If replacement sensor does not correct the fault, inspect ECU power/ground and input circuit and consider ECU testing/programming as last resort.
- Clear codes and perform drive/start/stop cycles to confirm code does not return.
Likely causes
- MAP sensor electrical failure
- Sensor harness short to ground causing low signal
- Broken 5 V reference or poor sensor ground
- Connector corrosion or pin deformation at sensor
- Vacuum line disconnected/blocked so sensor reads wrong pressure
- ECU input circuit fault (less common)
Fault status
Status
MAP sensor signal below expected threshold at engine stop — control module logged P1106. Inspect MAP sensor, related wiring/connectors, and intake pressure path.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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