SPN 111 FMI 3 — SPN 111 FMI 3 — Voltage above normal / shorted high

Often associated codes

• SPN 111 FMI 1SPN 111 FMI 1 — Low level

Likely causes

• Signal wire shorted to battery positive or another power feed
• Internal sensor short
• Damaged connector or poorly spliced harness repair

Recommended checks

1. 1

   Measure voltage at the sensor connector (key ON, engine off)

2. 2

   Inspect the harness between the ECM and sensor for rub-through or bad splices

3. 3

   Replace the sensor only after the circuit proves good

Parts to replace

• Affected sensor (SPN 111)

  AmazonRockAuto

• Harness repair kit

  AmazonRockAuto

• OEM connector

  AmazonRockAuto