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Cummins ISB CM850 (2003-06) Fault Code: 187 (Auto) PID: SID 232 SPN: 1080 FMI: 4 Sensor Supply Voltage Number 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the sensor supply number 2 circuit. Low voltage on the +5-VDC SUPPLY line can be caused by a short circuit to ground in a SUPPLY line, a short circuit between a SUPPLY line or a RETURN line, a malfunctioning sensor, or a malfunctioning ECM power supply. On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines): 1)The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs...

Cummins ISB CM850 (2003-06) Fault Code: 187 (Marine) PID: SID 232 SPN: 1080 FMI: 4 Sensor Supply 2 Circuit – Voltage Below Normal, or Shorted to Low Source. Low voltage detected at the sensor supply number 2 circuit. Low voltage on the +5-VDC supply line can be caused by a short circuit to ground in a supply line, a short circuit between a supply line or a return line, a failed sensor, or a failed ECM power supply. Possible repairs: 1)Replace the intake manifold pressure sensor.2)Replace the rail fuel pressure sensor.3)Repair or replace the engine harness.4)Replace the ECM.

Cummins ISB CM850 (2003-06) Fault Code: 1892 PID: 84 SPN: 84 FMI: 1 Wheel-Based Vehicle Speed ? Data Valid but Below Normal Operational Range ? Moderately Severe Level. The ECM lost the vehicle speed signal. There are multiple types of vehicle speed sensors. Various types include magnetic pickup, data link, digital, and tachograph. Refer to your OEM for the specific type installed on the vehicle. This fault is set active when the ECM loses a vehicle speed signal when other engine conditions indicate the vehicle is moving. The fault can also become active if there is a series of clutch,...

Cummins ISB CM850 (2003-06) Fault Code: 1911 PID: 157 SPN: 157 FMI: 0 Injector Metering Rail Number 1 Pressure – Data Valid But Above Normal Operating Range – Most Severe Level. Fuel pressure signal indicates that fuel pressure has exceeded the maximum limit for the given engine rating. Fault Code 1911 is activated when the sensed rail fuel pressure reaches the opening pressure of the rail fuel pressure relief valve. Sensed pressure has exceeded system target range. In normal engine operation, the ECM calibration varies the flow commanded to the fuel pump actuator to achieve the correct fuel rail pressure....

Cummins ISB CM850 (2003-06) Fault Code: 195 (2 wires) PID: 111 SPN: 111 FMI: 3 Coolant Level Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at engine coolant level circuit. Possible causes of this fault code include: ?Open return or signal circuit in the harness, connectors, or sensor?Signal wire shorted to sensor supply or battery voltage. Possible repairs: 1)Replace the engine coolant level sensor.2)Repair or replace the OEM harness.3)Replace the ECM.