Code Details
| Display code | Navistar Aware SPN 704 FMI 3 |
|---|---|
| SPN | 704 |
| FMI | 3 |
| OEM code | Navistar / International Aware SPN 704 FMI 3 |
| Manufacturer | Navistar / International |
| System | Aware Vehicle Intelligence / Telematics |
| Component | Analog Input 4 — short to supply |
| Source address | Unknown or not applicable |
| Severity | medium |
| Review status | ai source checked |
| Source confidence | high |
| Last reviewed | 2026-03-26 |
Plain-English Meaning
The Aware module's Analog Input 4 input is designed to accept a specific voltage range from the connected sensor or device. When the voltage goes above the configured 'Short to Battery' limit and stays there beyond the timeout, the Aware module flags it as a wiring fault — the input appears to be connected to battery voltage rather than the sensor output.
Navistar S08312 maps Navistar Aware SPN 704 FMI 3 to Analog Input 4 — voltage above normal or shorted high at (Grey connector, Pin 5). The fault activates when the voltage exceeds the Analog 4 Short to Battery parameter for longer than the configured Analog 4 Short to Battery Timeout. Both parameters are configurable in the Aware module setup.
Common Symptoms
- Aware Vehicle Intelligence alert active
- Analog Input 4 at (Grey connector, Pin 5) reads above the expected sensor output range — possibly near battery voltage
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- Wiring chafed against a powered circuit, connecting Analog Input 4 to battery voltage
- Sensor or device connected to the input has failed with output stuck high or shorted to supply internally
- Short-to-battery configuration threshold set too low for the actual sensor output range, causing false faults at legitimate high-end readings
- Incorrect sensor installed with a higher output voltage range than the Aware input is configured to accept
First Checks
- Measure the voltage at (Grey connector, Pin 5) with the Aware module connected and the vehicle in the condition that sets the fault — confirm the voltage is genuinely high rather than a configuration mismatch.
- Review the Aware module configuration for Analog Input 4: confirm the Short to Battery threshold is appropriate for the connected sensor's output range.
- Disconnect the sensor from the input pin and re-measure — if the voltage drops, the sensor or its wiring is the source of the overvoltage.
- Inspect the harness from the Aware connector to the sensor for chafing against the vehicle chassis or other powered circuits.
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
Can a misconfigured threshold cause Navistar Aware SPN 704 FMI 3 without an actual wiring fault?
Yes. If the Short to Battery threshold in the Aware module is set lower than the sensor's maximum output voltage, the module will flag a fault at the top of the sensor's normal range. Reviewing the configured threshold against the sensor's specification is the recommended first step before inspecting wiring.
Does Navistar Aware SPN 704 FMI 3 indicate a permanent fault or can it be intermittent?
It can be intermittent. A sensor with an output that peaks above the threshold only under certain conditions (high temperature, full-scale reading) may set the fault only at those extremes. Intermittent high-voltage conditions are often easier to catch by monitoring in real-time with Navistar diagnostic software rather than by static inspection.
Is a short to battery on an Aware analog input dangerous?
The primary risk is damage to the Aware module's input circuit if the overvoltage is significant or sustained. The Aware module has protection, but sustained overvoltage above the absolute maximum input rating can cause damage. Address the fault before long-term operation with the condition present.