Cummins ISB CM850 (2003-06) Fault Code: 528 PID: 93 SPN: 93 FMI: 2 Auxiliary Alternate Torque Validation Switch – Data Erratic, Intermittent, or Incorrect. An error has been detected in the alternate torque switch circuit. The switch can be monitored for proper operation in INSITE? electronic service tool. If the switch is changing state correctly on the service tool, then the problem does not lie in the switch circuit. The three position-switch has three states: 1)Position 1 – open2)Position 2 – closed3)Position 3 – 1500 ohm resistance The two position-switch has two states: 1)Position 1 – open2)Position 2 – closed...

Cummins ISB CM850 (2003-06) Fault Code: 529 PID: SID 51 SPN: 703 FMI: 3 Auxiliary Input/Output 3 Circuit – Voltage Above Normal, or Shorted to High Source. High signal voltage has been detected at the auxiliary input/output 3 circuit. The ECM monitors the voltage level on this circuit. When the ECM commands the OEM output signal low, it expects the voltage level to be approximately zero volts. If it detects a high voltage, this fault is recorded. If Fault Code 529 is still active after completing the following troubleshooting steps, consult the OEM service literature for procedures to check the...

Cummins ISB CM850 (2003-06) Fault Code: 545 PID: SID 32 SPN: 1188 FMI: 7 Turbocharger 1 Wastegate Control ? Mechanical System Not Responding Properly or Out of Adjustment. Intake manifold pressure has exceeded the maximum limit for the given engine rating. This fault code become active when the intake manifold pressure exceeds the maximum pressure limit for a given engine rating. Possible causes: 1)Malfunctioning turbocharger wastegate2)Wastegate tampering3)Wrong turbocharger part4)Possible tampering of the fuel system or turbocharger system. On-Board Diagnostics (OBD) Information: 1)The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.2)The ECM turns OFF the malfunction...

Cummins ISB CM850 (2003-06) Fault Code: 551 (ISS) PID: SID 230 SPN: 558 FMI: 4 Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source. No voltage detected simultaneously on both the idle validation and off-idle and on-idle switches. 1)This fault code is usually caused by a short circuit to ground in the harness, an uncalibrated accelerator pedal or lever assembly, or a miswired idle validation switch.2)When installing a new accelerator pedal or lever assembly, it must be calibrated before operating the engine. To calibrate, turn the keyswitch to the ON position, and fully...

Cummins ISB CM850 (2003-06) Fault Code: 551 (NISS) PID: SID 230 SPN: 556 FMI: 4 Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source. No voltage detected simultaneously on both the idle validation off-idle and on-idle circuits. 1)This fault code is usually caused by a short circuit to ground in the harness, an uncalibrated accelerator pedal or lever assembly, or a miswired idle validation switch.2)When installing a new accelerator pedal or lever assembly, it must be calibrated before operating the engine. To calibrate, turn the keyswitch to the ON position, and fully depress...