TurboDetroit Diesel Diesel ECM

SPN 2629 FMI 3

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 2629 FMI 3 usually indicates an air-management or turbo-related sensor circuit voltage above normal. The ECM is seeing a high signal from a sensor used to calculate boost, pressure, or airflow. This can result in false readings and incorrect turbo control.

Likely Causes

Short to voltage, failed sensor, connector corrosion, damaged harness, incorrect reference voltage, or controller input issue.

What To Check First

Check the exact sensor named by DiagnosticLink, test reference/signal/ground circuits, inspect connector pins, and compare live data to known-good values before replacing the sensor. Verify final definition in Detroit DiagnosticLink because FMI meaning can vary by engine year, ACM/MCM calibration, and emissions level.

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Internal Linking

Related Turbo Fault Codes

View All Turbo Codes

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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