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Ambient Air Density – Data Valid But Below Normal Operational Range – Least Severe Level
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 1943 PID: SPN: 3555 FMI: 1/17 LAMP: None SRT: |
Low ambient air density has been calculated by the electronic control module. |
Fuel is limited in an attempt to protect the engine. |
 Low Ambient Air Density
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Circuit Description
The ambient air density is calculated by the electronic control module (ECM). Ambient air density is derived by the ECM, based on ambient air pressure and ambient air temperature.
Component Location
There is not a physical ambient air density sensor in the system. The ambient air density is a calculation based on the ambient air pressure and temperature.
Shop Talk
The most common cause of this fault code is high altitude. The fault code can also be caused by extreme ambient air temperatures. This derate can be viewed in the INSITE™ electronic service tool, User Fueling State, as Air Density Limit State.
NOTE: The engine must be loaded to trip this fault code in the shop. The engine must be under the same operating conditions (altitude and temperature) at the time that it had originally logged.
Refer to Troubleshooting Fault Code t05-1943
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