Cummins fault code 2556 is the Cummins ISX11.9 CM2250 troubleshooting document for Engine Intake Air Heater 1 Circuit – Voltage Below Normal or Shorted to Low Source (SPN 729, FMI 4). This 13-page factory guide explains the circuit, the conditions that set the code, and the guided repair steps used with the INSITE electronic service tool. The intake air heater improves starting and white smoke control in cold ambient conditions.
Official document details
| Brand | Cummins |
| Model coverage | 031 ISX11.9 CM2250 2883445 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 2556 (PID S70) |
| SPN / FMI | 729 / 4 |
| Warning lamp | Amber |
| Bulletin number | 2883445 |
| Revision | Last modified 11-Jun-2010 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Cummins fault code 2556 table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures table
- Guided troubleshooting steps
Applicable truck models
This troubleshooting procedure applies to Cummins 031 ISX11.9 CM2250 2883445 engines. The intake air heater is located at the air inlet connection to the intake manifold. The location of the intake air heater relays will. The document states the code is set when intake air heater circuit pwm signal is not detected to be system voltage when the pwm signal is turned on. When the code is active, the amber warning lamp is illuminated when this diagnostic runs and fails. Full specifications and procedure references are published by Cummins on the Cummins official website.
Who needs this Cummins fault code 2556 manual
Diesel technicians and workshop owners diagnosing Voltage Below Normal or Shorted to Low Source on ISX11.9 CM2250 engines need this reference. Possible causes documented in the Shop Talk section include a shorted intake air heater relay, intake air heater relay supply wire shorted to ground. The guide walks through each guided step and the INSITE electronic service tool tests required to validate the repair and clear the code. Each guided step lists the keyswitch position, the required action, and the YES or NO branch that follows.
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