International Fault Code SPN 191 FMI 4: TOSS / VSS Signal – Out of Range LOW

Code details

Manufacturer

International (Navistar)

Applies to

International MaxxForce DT (2010–2019)

Fault code

SPN 191 FMI 4

J1939 SPN

191

FMI

4 — Voltage below normal, or shorted to low source

Truck models in source

3200, 4100, 4300, 4400, 7300, 7400, 7500, 7600, 7700, 8500, 8600, BE 200, CE Bus, CXT, DuraStar, LoneStar, MXT, ProStar, RXT, TranStar, WorkStar

What to do next

• Read active and inactive codes with the OEM service tool (Diamond Logic Builder can clear previously active codes) and note the occurrence count.
• FMI 4 tells the shop the type of failure to test for: voltage below normal, or shorted to low source.
• Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.

Related fault codes

• International Fault Code SPN 191 FMI 4 — Transmission 1 Output Shaft Speed: Voltage Below Normal, Or Shorted To Low Source
• International Fault Code SPN 191 FMI 14 — TOSS / VSS Error – Invalid Signal
• International Fault Code SPN 191 FMI 3 — TOSS / VSS Signal – Out of Range HIGH
• International Fault Code SPN 191 FMI 5 — TOSS / VSS Open Circuit Fault
• International Fault Code SPN 191 FMI 19 — Transmission 1 Output Shaft Speed: Received Network Data In Error
• International Fault Code SPN 191 FMI 2 — Transmission 1 Output Shaft Speed: Data Erratic, Intermittent Or Incorrect
• International Fault Code SPN 191 FMI 3 — Transmission 1 Output Shaft Speed: Voltage Above Normal, Or Shorted To High Source
• Cummins Fault Code 349 — Transmission Output Shaft (Tailshaft) Speed High – Warning