What is the fault code for a turbocharger?
CODE REASON EFFECT Fault Code: 691 PID: SPN: 1172 FMI: 3/3 LAMP: Amber SRT: Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the turbocharger compressor inlet air temperature circuit. Engine power derate.
How does the turbocharger inlet air temperature sensor work?
The turbocharger compressor inlet air temperature sensor is used by the ECM to monitor the temperature of the intake air temperature coming into the turbocharger. The ECM monitors the voltage on the signal pin and converts this to a temperature value.
What happens when there is a leak in a turbocharger?
A turbocharger works by increasing the air pressure going into the engine. If there are leaks along the air intake system, the turbocharger will need to work harder to produce the same amount of air pressure. The increased strain on the turbocharger will reduce the efficiency and will wear out internal components faster.
What should I do if my turbocharger is not working?
However, you should not rely solely on the diagnostic fault codes – further checks will be necessary to find the root cause of the fault code being logged. A turbo boost gauge will show you how much boost pressure your turbocharger is producing in real time.
How does air intake temperature affect turbocharger speed?
Air intake temperature The energy needed to compress the air is directly proportional to the intake temperature. Therefore, at a given turbocharger speed, the pressure ratio of the compressor decreases with increasing intake temperature, and vice versa.
Where is the air temperature sensor located on a turbocharger?
This temperature is one of many inputs used by the ECM to control engine operation and emissions. Component Location. The turbocharger compressor inlet air temperature sensor is located in the compressor casing of the turbocharger.
What are the properties of air taken in by a turbocharger?
The properties of the air taken in by the compressor are: – barometric pressure – air intake temperature – humidity While the first and second of these have an immediate effect on turbocharger performance, there are also some secondary influences of an external nature which could cause the turbo – charger performance to change.