Diagnostic trouble code (DTC) information ECM-1100

Condition 

Diagnostic trouble code (DTC) ECM-1100 (signal too high or too low) is stored if the signal from the outside temperature sensor is outside of its normal range. The fault is diagnosed by the control module when the ignition is on or the engine is running.

Diagnostic trouble code (DTC) ECM-1100 (faulty signal) is stored if the signal from the outside temperature sensor is within its normal range but deviates from the calculated temperature. The fault is diagnosed by the control module when the engine is running, approximately 2 minutes after the engine is started.

Substitute Value 

The values from the engine intake air temperature (IAT) sensor.

Possible Source 

Signal too high: 

• Short-circuit to ground in the signal cable
• Faulty outside temperature sensor.

Signal too low: 

• Open-circuit in the signal cable
• Short-circuit to supply voltage in the signal cable
• Faulty outside temperature sensor
• Contact resistance in the terminals.

Faulty signal: 

• Contact resistance in the terminals
• Faulty outside temperature sensor.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.