Cummins ISB CM850 (2003-06) Fault Code: 584 PID: SID 39 SPN: 677 FMI: 3 Starter Relay Circuit – Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at starter lockout circuit. The ECM monitors the voltage level on this circuit. If it detects a voltage when the signal is commanded off, it records this fault code. Possible causes: 1)Open circuit in the starter lockout relay, OEM harness, or connectors2)Short circuit to a voltage source in the OEM harness or relay. Possible repairs: 1)Replace the starter lockout relay.2)Replace the OEM harness.3)The removal and installation of the...

Cummins ISB CM850 (2003-06) Fault Code: 585 PID: SID 39 SPN: 677 FMI: 4 Starter Relay Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at starter lockout circuit. The ECM monitors the voltage level on this circuit. If it detects a low voltage when the signal is commanded on, it records this fault code. This fault code can be caused by a short circuit to ground in the starter lockout relay, OEM harness, or connectors. Possible repairs: 1)Replace the starter lockout relay.2)Repair or replace the OEM harness.3)The removal and installation of the connector may correct...

Cummins ISB CM850 (2003-06) Fault Code: 595 (ISB) PID: 103 SPN: 103 FMI: 0 Turbocharger Number 1 speed high – warning level. High turbocharger speed has been detected. This fault code becomes inactive at key-on or any time the ECM detects a valid turbocharger speed signal. One cause of this fault code is high-frequency electrical noise. If the fault occurs intermittently, check the circuit and the sensor pigtail connector for opens or short circuits. Possible repairs: 1)Repair or replace the engine harness.2)Replace the turbocharger speed sensor. Cummins ISB CM850 (2003-06) Fault Code: 595 (ISC) PID: 103 SPN: 103 FMI: 0...

Cummins ISB CM850 (2003-06) Fault Code: 595 (ISC) PID: 103 SPN: 103 FMI: 0 Turbocharger Number 1 Speed High – Data Valid but Above Normal Operational Range – Moderately Severe Level. High turbocharger speed has been detected. This fault can come active any time the key is on and the electronic control module (ECM) detects turbocharger speed greater than a calibration limit. This fault can be caused by failures in the following components: 1)Turbocharger speed sensor2)Engine harness3)ECM power supply or grounds4)Electronic vehicle accessories which emit excessive electromagnetic interference. This fault becomes inactive any time the ECM detects a valid turbocharger...

Cummins ISB CM850 (2003-06) Fault Code: 596 PID: 167 SPN: 167 FMI: 0 Electrical Charging System Voltage High – Data Valid But Above Normal Operating Range – Moderately Severe Level. High battery voltage detected by the battery voltage monitor feature. This fault code is part of the Alternator Failure Warning feature. The ECM can increase idle speed and deactivate the idle decrement switch if idle speedup is enabled. View the Alternator Failure Warning feature settings using the INSITE? electronic service tool. Disabling the Alternator Failure Warning feature will also disable this fault code. Make sure the ECM battery supply (+)...