Conditions for diagnostic trouble code (DTC):1) Current below normal or open circuit Diagnostic operating conditions1) Ignition key in ON position Observable symptoms1) The exhaust brake does not function2) Low Power Probable cause1) Open circuit between air valve unit control valve and engine control module (ECM)2) Open circuit on supply wire to air valve unit3) Open circuit in air valve unit control valve Volvo All Engines (2010 Emissions) Fault Code: SPN 1074 FMI 4 PID: Engine (Exhaust) Brake Output Volvo All Engines (2010 Emissions) Fault Code: SPN 1074 FMI 3 PID: Engine (Exhaust) Brake Output Volvo All Engines (2010 Emissions) Fault...

The Ambient Pressure Sensor is located inside the Engine Control Module (ECM) and can therefore not be checked.The signal is used to calculate intake manifold pressure (IMP) as well as to compensate for fuel when driving at high altitudes.The engine control module (ECM) will set a diagnostic trouble code (DTC) if the sensor signal is not within predetermined limits, or the signal is not rational. Conditions for diagnostic trouble code (DTC):1) Irrational pressure Probable cause1) Barometric Pressure (BARO) Sensor2) If the sensor is blocked by e.g. dirt, paint or stickers it may send an incorrect value Detailed information1) The sensor...

The Ambient Pressure Sensor is located inside the Engine Control Module (ECM) and can therefore not be checked.The signal is used to calculate intake manifold pressure (IMP) as well as to compensate for fuel when driving at high altitudes.The engine control module (ECM) will set a diagnostic trouble code (DTC) if the sensor signal is not within predetermined limits, or the signal is not rational. Conditions for diagnostic trouble code (DTC):1) The barometric pressure (BARO) from the sensor is irrational Observable symptoms1) Poor response at high altitudes Probable cause1) Barometric Pressure (BARO) Sensor Detailed information1) The sensor is located in...

The Ambient Pressure Sensor is located inside the Engine Control Module (ECM) and can therefore not be checked.The signal is used to calculate intake manifold pressure (IMP) as well as to compensate for fuel when driving at high altitudes.The engine control module (ECM) will set a diagnostic trouble code (DTC) if the sensor signal is not within predetermined limits, or the signal is not rational. Conditions for diagnostic trouble code (DTC):1) The barometric pressure (BARO) from the sensor is irrational Observable symptoms1) Poor response at high altitudes Probable cause1) Barometric Pressure (BARO) Sensor Detailed information1) The sensor is located in...

The Engine Coolant Temperature Sensor is a thermistor. The resistance of the Engine Coolant Temperature Sensor changes inversely to the temperature of the engine coolant. When the coolant is cold, the sensor resistance is high. As the temperature of the coolant increases, the sensor resistance decreases.The Engine Control Module (ECM) monitors the voltage drop across the Engine Coolant Temperature Sensor.The coolant temperature signal is used to calculate fuel injection and to evaluate operating conditions of the engine coolant temperature. Examples of conditions that may cause high coolant temperature are: thermostat failure, fan failure, heavy load, high ambient temperatures and radiator...