P1104

Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): EMS EOBD, EMS OBD II · Factory MIL flag: 2 · Default action: ECM Default: –Default air mass used –Adaptive fuel metering inhibited –Catalyst warm up ignition retard inhibited –Canister purge inhibited –Maximum engine speed reduced

Common causes

• MAF Sensor to ECM sensor ground circuit: open circuit
• short circuit to high voltage
• high resistance MAF Sensor to ECM sensing circuit: open circuit MAF Sensor failure
• MAF Sensor to ECM sensor ground circuit open circuit
• Mass Air Flow Ground Malfunction (MAF)
• Mass Air Flow Ground Malfunction

Quick checks

• Confirm freeze-frame and conditions when the code set
• Inspect connectors, grounds, and harness for the circuit named in the code
• Compare live sensor values vs expected (unplugged/biased sensors are common)

Typical fixes

• Check MAF grounding