Cumminz

Cummins ISB CM550 (1990-94) Fault Code: 381 PID...

Circuit DescriptionThe intake air heater improves starting and white smoke control in cold ambient conditions.The ECM controls relays that switch power to the air heater. There are two heating coils...

Cummins ISB CM550 (1990-94) Fault Code: 381 PID...

Circuit DescriptionThe intake air heater improves starting and white smoke control in cold ambient conditions.The ECM controls relays that switch power to the air heater. There are two heating coils...

Cummins ISB CM550 (1990-94) Fault Code: 377 PID...

Circuit DescriptionThis circuit is internal to the ECM. If the keyswitch is turned off and the ECM still detectsmessages being sent from the fuel pump, the ECM will log this...

Cummins ISB CM550 (1990-94) Fault Code: 377 PID...

Circuit DescriptionThis circuit is internal to the ECM. If the keyswitch is turned off and the ECM still detectsmessages being sent from the fuel pump, the ECM will log this...

Cummins ISB CM550 (1990-94) Fault Code: 376 PID...

Circuit DescriptionThis diagnostic is meant to act as a speed and fueling rationality check between the enginecontrol module (ECM) and the fuel pump control module. Component LocationThe logic for this...

Cummins ISB CM550 (1990-94) Fault Code: 376 PID...

Circuit DescriptionThis diagnostic is meant to act as a speed and fueling rationality check between the enginecontrol module (ECM) and the fuel pump control module. Component LocationThe logic for this...

Cummins ISB CM550 (1990-94) Fault Code: 375 PID...

Circuit DescriptionThe ECM contains the calibration-specific parameter to control the engine’s performance and diagnostics. The fuel pump has its own calibration to interpret the ECM message and controlthe pump. If...

Cummins ISB CM550 (1990-94) Fault Code: 375 PID...

Circuit DescriptionThe ECM contains the calibration-specific parameter to control the engine’s performance and diagnostics. The fuel pump has its own calibration to interpret the ECM message and controlthe pump. If...

Cummins ISB CM550 (1990-94) Fault Code: 375 PID...

Circuit DescriptionThe ECM contains the calibration-specific parameter to control the engine’s performance and diagnostics. The fuel pump has its own calibration to interpret the ECM message and controlthe pump. If...

Cummins ISB CM550 (1990-94) Fault Code: 375 PID...

Circuit DescriptionThe ECM contains the calibration-specific parameter to control the engine’s performance and diagnostics. The fuel pump has its own calibration to interpret the ECM message and controlthe pump. If...

Cummins ISB CM550 (1990-94) Fault Code: 374 PID...

Circuit DescriptionFuel pump self-test is provided at power-up. In an ideal case, an active Fault Code 374indicates a fuel pump defect and can trigger the engine light/malfunction indicator light at...

Cummins ISB CM550 (1990-94) Fault Code: 374 PID...

Circuit DescriptionFuel pump self-test is provided at power-up. In an ideal case, an active Fault Code 374indicates a fuel pump defect and can trigger the engine light/malfunction indicator light at...

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