Circuit DescriptionThis circuit is internal to the fuel pump and detects fuel solenoid movement. Component LocationThe fuel pump is located on the backside of the gear housing on the intake side of the engine. Shop TalkNo current inflection recognized within the solenoid closing time. This fault is typically set when a fuel pump beginning of injection point error is recognized at engine speeds greater than 700 rpm and commanded fueling greater than 20 mm3 [0.787 in3] for 2 seconds at battery voltage (greater than 9-VDC). The fault code can be triggered by electrical noise or voltage feedback on ground loop....

Circuit DescriptionThis circuit is internal to the fuel pump and detects fuel solenoid movement. Component LocationThe fuel pump is located on the backside of the gear housing on the intake side of the engine. Shop TalkNo current inflection recognized within the solenoid closing time. This fault is typically set when a fuel pump beginning of injection point error is recognized at engine speeds greater than 700 rpm and commanded fueling greater than 20 mm3 [0.787 in3] for 2 seconds at battery voltage (greater than 9-VDC). The fault code can be triggered by electrical noise or voltage feedback on ground loop....

Circuit DescriptionThis circuit is used to communicate fueling, timing, and pump status messages between the ECM and pump controller. If this link is lost, the pump will operate in a backup mode based on the idle signal (pin 4). Component LocationThe datalink is located within the ECM and fuel pump control module. Shop Talk1) The datalink is used to communicate fueling and timing commands, as well as pump statusmessages. If the datalink is lost, the pump will operate in backup mode based on idle signal (pin 4 at fuel pump connector).2) This fault code will be active if the fuel...

Circuit DescriptionThis circuit is used to communicate fueling, timing, and pump status messages between the ECM and pump controller. If this link is lost, the pump will operate in a backup mode based on the idle signal (pin 4). Component LocationThe datalink is located within the ECM and fuel pump control module. Shop Talk1) The datalink is used to communicate fueling and timing commands, as well as pump statusmessages. If the datalink is lost, the pump will operate in backup mode based on idle signal (pin 4 at fuel pump connector).2) This fault code will be active if the fuel...

Circuit DescriptionPower is supplied to the through a relay. When the engine control module (ECM) switches the relay, power is supplied from the battery, through the relay, to the fuel pump. Component LocationInternal to the pump. Shop TalkThe fuel pump control module compares battery voltage to supply voltage while energizing the fuel metering solenoid. If this measured voltage drop is excessive, there is high resistance in the fuel pump power supply circuit. Cummins ISB CM550 (1990-94) Fault Code: 364 PID: SID 233 SPN: 1077 FMI: 9 Engine Control Module (ECM) to Pump Communications Error Cummins ISB CM550 (1990-94) Fault Code:...