Cummins ISB CM850 (2003-06) Fault Code: 1849 PID: SPN: 3241 FMI: 10 Exhaust Gas Temperature 1 ? Abnormal Rate of Change. The catalyst inlet temperature sensor is not responding to a change in engine operating conditions. The exhaust gas temperature 1 is monitored during engine warm-up. If the exhaust gas temperature 1 reading is not changing to match the engine operating conditions, the exhaust gas temperature 1 sensor is then determined to be stuck in-range and this fault code is logged. The ECM must not see engine speed for a period of eight hours before this diagnostic will run. Possible...

Cummins ISB CM850 (2003-06) Fault Code: 1851 PID: SPN: 3249 FMI: 10 Exhaust Gas Temperature 2 ? Abnormal Rate of Change. The catalyst outlet temperature sensor is not responding to a change in engine operating conditions. The exhaust gas temperature #2 is monitored during engine warm-up. If the exhaust gas temperature 2 reading is not changing to match the engine operating conditions, the exhaust gas temperature 2 sensor is then determined to be stuck in-range and this fault code is logged. The ECM must not see engine speed for a period of eight hours before this diagnostic will run. Possible...

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...

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,...