Cummins ISM CM875 (2003-06) Fault Code: 284 PID: S221 SPN: 1043 FMI: 4/4 Engine Speed Sensor Supply Voltage Circuit – shorted low. Incorrect voltage detected on the ECM voltage supply line to the engine speed sensor.
The ECM monitors the voltage level on the engine speed sensor +5 volt supply circuit. If voltage falls below a calibratible limit then this fault is recorded.
Possible causes:
1) A short circuit to ground in the engine harness, sensor, or ECM.
Possible repairs:
1)Replace the engine speed sensor.
2)Replace the ECM.
3)Replace the engine harness.
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Volvo Premium Tech Tool PTT 2.8.130 Diagnostic Software 04.2022 ACPI ( 1 PC )
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