Faulty induction control motor position sensor; Wiring damage (open, short, or chafed wires) between the sensor and the ECM; Corroded or loose electrical connectors at the sensor or ECM; Sticking or binding induction control valve linkage, preventing proper movement; Failed induction control motor (actuator) causing the sensor to report an out-of-range position; Carbon buildup or mechanical obstruction in the intake tract; ECM internal fault (less common)

DTC codes / Mitsubishi codes / P1100

P1100 · MitsubishiInduction Control Motor Position Sensor Fault

Q: What does code P1100 mean?

Induction Control Motor Position Sensor Fault. P1100 on Mitsubishi vehicles indicates that the engine control module (ECM) has detected an implausible or missing signal from the induction control motor position sensor, which is part of the variable intake system. The ECM expects a specific feedback voltage as the motor moves the induction control valve, and when that voltage falls outside the expected range or does not change as commanded, the code is stored and the check engine light is illuminated.

P1100 on Mitsubishi vehicles indicates that the engine control module (ECM) has detected an implausible or missing signal from the induction control motor position sensor, which is part of the variable intake system. The ECM expects a specific feedback voltage as the motor moves the induction control valve, and when that voltage falls outside the expected range or does not change as commanded, the code is stored and the check engine light is illuminated.

SystemPowertrain

Code typeMitsubishi specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Check engine light illuminated, often with no other noticeable symptoms
Slight hesitation or stumble during acceleration, especially at lower engine speeds
Reduced engine power or sluggish throttle response
Rough idle or unstable idle quality
Poor fuel economy in some cases
In rare instances, the engine may enter limp mode

Common causes, most likely first

Faulty induction control motor position sensor
Wiring damage (open, short, or chafed wires) between the sensor and the ECM
Corroded or loose electrical connectors at the sensor or ECM
Sticking or binding induction control valve linkage, preventing proper movement
Failed induction control motor (actuator) causing the sensor to report an out-of-range position
Carbon buildup or mechanical obstruction in the intake tract
ECM internal fault (less common)

How to diagnose and fix it

Connect a scan tool and verify P1100 is the only stored code; check for related codes and freeze-frame data
Visually inspect the induction control motor, position sensor, and associated wiring for obvious damage, corrosion, or loose connections
Perform a resistance and voltage check on the position sensor according to Mitsubishi service information, comparing to specifications
Check the induction control valve for free movement and clean any carbon buildup or obstruction
Test the induction control motor circuit for power, ground, and signal integrity; repair any wiring faults
If the sensor or motor fails testing, replace the faulty component and clear the code
After repair, clear codes and perform a road test to confirm the monitor runs and the code does not return

Don't overlook the intake linkage

A sticking induction control valve is a frequent culprit that mimics a sensor failure, so always verify the valve moves freely before condemning the sensor.
The position sensor is often integrated with the induction control motor, meaning a motor fault can set a position sensor code even when the sensor itself is good.
Wiring harness chafing near the intake manifold is common on older Mitsubishi models and can cause intermittent P1100 without any driveability symptoms.
After replacing the sensor or motor, a relearn or adaptation procedure may be required on some models to calibrate the new component to the ECM.
P1100 can be set by a weak battery or charging system issue that causes low voltage to the ECM, so check battery condition and grounds before replacing parts.

Can I keep driving with P1100?

You can generally continue driving with P1100, but avoid aggressive acceleration or heavy loads until the fault is repaired, as the engine may lack full power and fuel economy could suffer. If the engine enters limp mode or runs poorly, seek service promptly to prevent further damage.

Tools that help

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Guidance is general and written for Mitsubishi vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.