FMI 4 — Voltage below normal or shorted low
The sensor circuit voltage is lower than it should ever be, usually near zero.
What it typically points to
Signal wire shorted to ground, a lost 5 V reference, or an open signal wire on a pulled-down circuit.
Codes with FMI 4
- SPN 27 FMI 4EGR Valve Position
- SPN 91 FMI 4Accelerator Pedal Position 1
- SPN 94 FMI 4Fuel Delivery Pressure
- SPN 97 FMI 4Water in Fuel Indicator
- SPN 100 FMI 4Engine Oil Pressure
- SPN 102 FMI 4Intake Manifold #1 Pressure (Boost)
- SPN 105 FMI 4Intake Manifold #1 Temperature
- SPN 108 FMI 4Barometric Pressure
- SPN 110 FMI 4Engine Coolant Temperature
- SPN 111 FMI 4Coolant Level
- SPN 157 FMI 4Injector Metering Rail 1 Pressure (Fuel Rail)
- SPN 171 FMI 4Ambient Air Temperature
- SPN 175 FMI 4Engine Oil Temperature 1
- SPN 412 FMI 4EGR Temperature
- SPN 627 FMI 4Power Supply
- SPN 1761 FMI 4Aftertreatment 1 DEF Tank Volume
- SPN 3216 FMI 4Aftertreatment 1 Intake NOx
- SPN 3226 FMI 4Aftertreatment 1 Outlet NOx
- SPN 3242 FMI 4Aftertreatment 1 DPF Intake Gas Temperature
- SPN 3251 FMI 4Aftertreatment 1 DPF Differential Pressure