Code Details
| Display code | Navistar Aware SPN 703 FMI 13 |
|---|---|
| SPN | 703 |
| FMI | 13 |
| OEM code | Navistar / International Aware SPN 703 FMI 13 |
| Manufacturer | Navistar / International |
| System | Aware Vehicle Intelligence / Telematics |
| Component | Accessory Equipment Input 3 — calibration |
| Source address | Unknown or not applicable |
| Severity | medium |
| Review status | ai source checked |
| Source confidence | high |
| Last reviewed | 2026-03-26 |
Plain-English Meaning
Accessory Equipment inputs on the Navistar Aware module use configurable voltage thresholds to define the operating range of a connected accessory device. When the thresholds are not set in ascending order — where each threshold value must be greater than the previous — the Aware module cannot evaluate the input correctly and sets this calibration fault.
Navistar S08312 maps Navistar Aware SPN 703 FMI 13 to Accessory Equipment Input 3 — out of calibration at (Grey connector, Pin 8). The fault activates when the voltage thresholds for the operating range are not in ascending order. This is an Accessory Equipment Input-specific application of FMI 13 (out of calibration/configuration error), distinct from the Analog Input 5-point curve fault.
Common Symptoms
- Aware Vehicle Intelligence alert active following configuration or accessory equipment setup
- Accessory Equipment Input 3 may not report the connected device's state correctly in the fleet portal
- Fault typically appears immediately after a configuration change
- The connected PTO, body switch, liftgate, reefer, or accessory status may remain stuck in one state in fleet reporting
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- Accessory Equipment Input 3 threshold values were entered in the wrong order during configuration
- Configuration file containing non-ascending thresholds was uploaded without validation
- Threshold values were set to the same voltage level for multiple operating range breakpoints
First Checks
- Review the Accessory Equipment Input 3 threshold configuration — confirm each threshold is strictly greater than the previous.
- Compare the threshold table against the accessory's actual output: a switch, pressure transducer, PTO request, and body-up signal usually need different breakpoints.
- Correct any non-ascending values and reload the configuration.
- Cycle the connected accessory through each state while watching live input voltage, then verify the corrected configuration clears the fault.
- If several trucks were configured from the same file, spot-check another unit before copying the corrected settings across the fleet.
Can I Keep Driving?
Severity depends on active status, warning lamps, affected system, and related codes. Stop safely for red stop lamps, brake warnings, oil pressure warnings, high coolant temperature warnings, severe derate, or any abnormal vehicle-control concern.
Related Lookup Pages
Sources
- Navistar Aware Vehicle Intelligence Diagnostic Trouble Codes S08312 Navistar / International Truck Body Builder · oem · accessed 2026-05-05 · confidence high
Source: Navistar / International Truck Body Builder, Navistar Aware Vehicle Intelligence Diagnostic Trouble Codes S08312. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - Navistar Engine Diagnostic Trouble Code Body Builder References Navistar / International Truck Body Builder · oem · accessed 2026-05-05 · confidence medium
Source: Navistar / International Truck Body Builder, Navistar Engine Diagnostic Trouble Code Body Builder References. This page paraphrases factual fields only and is not a substitute for the original document.
Open source
FAQ
How is this different from Analog Input 3 FMI 13?
Both use SPN 703 FMI 13 but represent different input operating modes. The Analog Input mode uses a 5-point calibration curve with X/Y value pairs. The Accessory Equipment Input mode uses simpler threshold-based configuration. The specific configuration screen in the Aware programming tool differs between the two modes.
Can the same physical pin be used as either Analog Input or Accessory Equipment Input?
Yes — the Grey connector pins for SPN 701-704 can be configured as either Analog Input or Accessory Equipment Input depending on the Aware module programming. The operating mode determines which FMI 13 condition applies. Review the current mode configuration to understand which calibration table needs to be corrected.
Is this fault a safety issue?
For accessory equipment monitoring, this fault means the Aware module cannot correctly evaluate the state of the connected accessory. The severity depends on what is connected to that input and whether the fleet relies on its reporting. The fault does not affect engine, brake, or safety systems.
What should be recorded before changing Accessory Equipment Input 3?
Record the current voltage thresholds, the accessory wired to (Grey connector, Pin 8), the live voltage in each accessory state, and the configuration file name loaded into the module. Those details make it possible to reverse a bad threshold edit and avoid pushing the same configuration mistake to other trucks.