TurboDetroit Diesel Diesel ECM

SPN 1172 FMI 4

Name: ECM Performance
Address: Fort Lauderdale, FL, 33325, US
Telephone: (888) 768-2447
Price range: $$-$$$

Turbocharger boost control and air-handling faults.

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System

Detroit Diesel Turbo

Detroit Diesel ECM Service

Diagnostic Overview

Detroit SPN 1172 FMI 4 usually indicates a turbo/air-system pressure sensor circuit voltage below normal. The ECM is seeing a low signal from a sensor used for boost or air-management control. This can cause low-power complaints or inaccurate turbo diagnostics.

Likely Causes

Short to ground, open signal wire, failed pressure sensor, poor connector contact, damaged harness, or low reference voltage.

What To Check First

Inspect wiring and connector pins, test the 5-volt reference and ground, compare pressure readings key-on engine-off, and repair circuit faults before replacing components. Verify final definition in Detroit DiagnosticLink because FMI meaning can vary by engine year, ACM/MCM calibration, and emissions level.

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Related Turbo Fault Codes

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Flash Code 1115

Detroit Flash Code 1115 appears to be a combined or reformatted flash-code entry rather than a standard modern SPN/FMI format.

Flash Code 47

Detroit Flash Code 47 is an older style Detroit/DDEC code that may relate to air-system or turbo-related diagnostics depending on engine generation.

Flash Code 48

Detroit Flash Code 48 should be treated as an older flash-code style turbo or air-management warning until it is converted to the exact SPN/FMI definition for the engine.

Flash Code 64

Detroit Flash Code 64 is an older Detroit/DDEC style code that can appear in turbo or engine-air-system diagnostics depending on configuration.

SPN 103 FMI 0

Detroit SPN 103 FMI 0 commonly indicates turbocharger speed is above the normal range at the most severe level.

SPN 103 FMI 1

Detroit SPN 103 FMI 1 commonly indicates turbocharger speed is below the expected range.

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