P1103 Possible Causes
- Faulty Manifold Absolute Pressure (MAP) sensor
- Open or shorted Manifold Absolute Pressure (MAP) sensor harness
- Poor electrical connection in Manifold Absolute Pressure (MAP) sensor circuit
- Faulty Engine Control Module (ECM)
How to Fix Code P1103?
Begin by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Illuminated engine light (or service engine soon warning light)
P1103 Meaning
The Manifold Absolute Pressure (MAP) sensor provides instant manifold pressure information to the engine’s Engine Control Module (ECM). This data is used to calculate air density and determine the engine’s mass air flow, which in turn determines the required fuel delivery for optimal combustion. A fuel-injected engine may also use a Mass Air Flow (MAF) sensor to detect intake air flow. A typical configuration uses either one or the other, but rarely both. The MAP/BARO Switch solenoid switches the air flow passage based on the voltage signal sent by the ECM.