Cummins ISM CM870 (2003-06) Fault Code: 689 PID: P190 SPN: 190 FMI: 2/2 Engine Crankshaft Speed/Position - Data Erratic, Intermittent, or Incorrect. The ECM has detected an error in the engine speed signal.

This fault is logged when the ECM does not receive a valid engine speed signal.

Possible causes:

1)Open or short circuit of the +5 volt supply, signal, or return wire in the engine harness
2)Damaged or malfinctioning engine speed sensor.

Possible repairs:

1)Replace the engine speed sensor.
2)Inspect the crankshaft tone wheel/gear teeth for damage or spinning.
3)Replace the ECM.
4)Repair or replace the engine harness.

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Cummins ISM CM870 (2003-06) Fault Code: 597 PID: P167 SPN: 167 FMI: 1/18 Electrical Charging System Voltage - Data Valid But Below Normal Operating Range - Moderately Severe Level. Low battery voltage detected by the battery voltage monitor feature.

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