Code Details
| Display code | Navistar Aware SPN 701 FMI 2 |
|---|---|
| SPN | 701 |
| FMI | 2 |
| OEM code | Navistar / International Aware SPN 701 FMI 2 |
| Manufacturer | Navistar / International |
| System | Aware Vehicle Intelligence / Telematics |
| Component | Analog Input 1 — digital mode |
| Source address | Unknown or not applicable |
| Severity | medium |
| Review status | ai source checked |
| Source confidence | high |
| Last reviewed | 2026-03-26 |
Plain-English Meaning
When a Navistar Aware input is configured in Digital Mode, the Aware module expects the voltage to be clearly above or clearly below a threshold — not floating in the middle. Navistar Aware SPN 701 FMI 2 means the input at (Grey connector, Pin 9) is reading in that ambiguous middle zone for more than 1 second. This is a configuration or wiring condition rather than a sensor failure.
Navistar S08312 maps Navistar Aware SPN 701 FMI 2 to Analog Input 1 Digital Mode — data erratic, intermittent or incorrect. In Digital Mode, the Aware module evaluates the input as a binary state. A voltage between 30 % and 70 % of the Vref (approximately 1.5 V to 3.5 V on a 5 V Vref) falls into the undefined zone for a 1-second qualifying period.
Common Symptoms
- Aware Vehicle Intelligence alert in the fleet portal or body-builder diagnostic output
- Analog Input 1 at (Grey connector, Pin 9) reads a mid-range voltage in Navistar diagnostic software
- The digital state of the input may toggle inconsistently or show as undetermined
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- The sensor or device connected to Analog Input 1 is outputting a voltage that does not go cleanly high or low — check the sensor type and its expected output range
- Wiring issue causing the input to float to a mid-range voltage rather than being pulled to a defined state
- Incorrect Aware module configuration for Analog Input 1 — the input may need to be reconfigured for Analog Mode if the connected device has a variable voltage output
- Pull-up or pull-down resistor missing from the circuit, leaving the input weakly driven
First Checks
- Measure the voltage at (Grey connector, Pin 9) with the Aware module connected — confirm the voltage corresponds to what the connected sensor is expected to output.
- Check the Aware module configuration for Analog Input 1: confirm the mode (Digital vs. Analog) matches the device connected to that pin.
- If the device is intended to be a two-state digital switch (open/closed), verify the switch fully opens or fully closes rather than leaving an intermediate resistance path.
- Check for damaged wiring or a missing pull resistor that would explain the input floating at mid-voltage.
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
Why does Navistar Aware SPN 701 FMI 2 only set in Digital Mode?
In Analog Mode, a mid-range voltage is a valid and expected measurement — the module reads the precise voltage value rather than assigning a binary state. The fault condition only applies in Digital Mode because that mode requires the voltage to be clearly on one side of the threshold. Reconfiguring the input to Analog Mode, if the connected device has a variable voltage output, would eliminate the mid-range zone fault.
What is the Vref reference for Analog Input 1?
The Vref supply for Navistar Aware analog inputs is typically 5 volts, provided on the Black connector Pin 4. The 30 % and 70 % thresholds described in the fault condition correspond to approximately 1.5 V and 3.5 V on a 5 V Vref. The exact Vref voltage can be verified by measuring Pin 4 on the Black connector.
Can this fault be caused by a pull resistor?
Yes. Without a pull-up or pull-down resistor on a digital input, the voltage can float to a mid-range value when the switch is open. If the connected switch or sensor does not actively drive the input to a high or low state in both positions, a pull resistor is needed to ensure a clean digital state in the open condition.