International SA 23 SPN 171 FMI 4: Fault on Analog Input 3 below normal when used for outside temperature

Code details

Manufacturer

International (Navistar)

Applies to

International / Navistar body controller (ESC) and multiplexed modules

Fault code

SA 23 SPN 171 FMI 4

J1939 SPN

171

FMI

4 — Voltage below normal, or shorted to low source

Reporting module

Electronic Gauge Cluster (EGC) (source address 23)

Component / signal

Ambient Air Temperature

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

Cause and when it sets

Cause: Voltage below normal, or shorted to low source

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 SA 23 SPN 171 FMI 3 — Fault on Analog Input 3 above normal when used for outside temperature
• International Fault Code SPN 171 FMI 0 — Ambient Air Temperature: Data Valid But Above Normal Operational Range – Most Severe Level
• International Fault Code SPN 171 FMI 2 — Ambient Air Temperature: Data Erratic, Intermittent Or Incorrect
• International Fault Code SPN 171 FMI 3 — Ambient Air Temperature : Voltage Above Normal, Or Shorted To High Source
• International Fault Code SPN 171 FMI 4 — Ambient Air Temperature: Voltage Below Normal, Or Shorted To Low Source
• PACCAR Fault Code P0072 — Ambient Temperature – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C78)
• PACCAR Fault Code P0073 — Ambient Temperature – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C78)
• PACCAR Fault Code P009A — Ambient Temperature – Data Erratic, Intermittent, or Incorrect