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Cummins ISX CM870 (2003-06) Fault Code: 387 PID...

This fault is logged when the ECM senses more than 5.25 volts on the accelerator pedal position +5 volt supply line. This can be caused by a short circuit to...

Cummins ISX CM870 (2003-06) Fault Code: 386 PID...

High voltage on the (+) 5 volt supply line can be caused by a short to battery voltage in the engine harness or connectors, or a malfinctioning ECM. Possible repair:...

Cummins ISX CM870 (2003-06) Fault Code: 352 PID...

Low voltage on the +5 volt supply wire can be caused by a short circuit to ground in a supply wire, a short circuit between a supply wire and a...

Cummins ISX CM870 (2003-06) Fault Code: 343 PID...

This fault can also be caused by resistance in the ECM battery supply (+) or (-) circuits. Resistance in these circuits can cause the voltage level at the ECM input...

Cummins ISX CM870 (2003-06) Fault Code: 341 PID...

The ECM is connected to the battery by the ECM power harness. This direct link provides a constant power supply for the ECM. The location of the battery will vary...

Cummins ISX CM870 (2003-06) Fault Code: 339 PID...

The ECM monitors the voltage level on this circuit. This fault code is logged if it detects a low voltage when the relay signal is commanded on. This fault code...