Lamp:Amber Reason:Engine wait to start lamp – mechanical system not responding or out of adjustment. Wait to start lamp has malfunction. Effect:None on performance. Circuit Description:Normally, switches, accelerators, and other components are connected to the Engine Control Module (ECM) directly through individual wires. Multiplexing allows those same components to be hard wired to an Original Equipment Manufacturer (OEM) Vehicle Electronic Control Unit (VECU) or transmission Electronic Control Unit (ECU) in the cab. Then component values and states from components such as sensors, accelerators, and switches can be transmitted from the OEM VECU to the OEM ECM over the SAE J1939...

Circuit DescriptionThe aftertreatment diesel exhaust fluid level sensor is used to monitor the diesel exhaust fluid level inside the diesel exhaust fluid tank. Component LocationThe aftertreatment diesel exhaust fluid tank level sensor is located in the aftertreatment diesel exhaust fluid tank. Location of the tank and level sensor is OEM dependent. Refer to the OEM service manual. Conditions for Running the DiagnosticsThe diagnostic runs continuously when the following conditions are met: Keyswitch is in the ON position or when the engine is running.Ambient temperature is above -20°C [-4°F].Vehicle altitude change is less than 305 m [1000 ft] in 1 hour.Conditions...

Circuit DescriptionThe aftertreatment diesel exhaust fluid level sensor is used to monitor the diesel exhaust fluid level inside the diesel exhaust fluid tank. Component LocationThe aftertreatment diesel exhaust fluid tank level sensor is located in the aftertreatment diesel exhaust fluid tank. Location of the tank and level sensor is OEM dependent. Refer to the OEM service manual. Conditions for Running the DiagnosticsThe diagnostic runs continuously when the following conditions are met: Keyswitch is in the ON position or when the engine is running.Ambient temperature is above -20°C [-4°F].Vehicle altitude change is less than 305 m [1000 ft] in 1 hour.Conditions...

Circuit DescriptionBetween each injection event, the Engine Control Module (ECM) attempts to recharge the injector power supply. The injector power supply consists of a bank of capacitors; if this power supply is maintained at high voltage. Recharging is accomplished by recovering energy stored in the injector solenoids. For the injector power supply to remain fully charged, there must be good ECM battery power and ground, a good engine speed sensor, and good injector circuits. Component LocationThe engine harness connects the ECM to the pass-through connector(s) that are located in the rocker housing. Internal injector harnesses are located under the valve...

Circuit DescriptionThe sensor supply 1 circuit of the engine control module (ECM) provides a 5 volt supply to various sensors on the engine harness. Refer to the wiring diagram for sensor supply identification. Component LocationSensor Supply 1 originates in the Engine Wiring Harness portion of the ECM. It supplies 5 volts to sensors in the engine wiring harness. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the sensor supply 1 signal voltage was less than...