SPN 103 - FMI 10 (Fault Code 2345)

SPN103 FMI10
Turbocharger 1 Speed - Abnormal Rate of Change

ISB, ISC, and ISL with CM2150 - Turbocharger 1 Speed Circuit

Fault Code: 2345
PID(P), SID(S): P103
SPN: 103
FMI: 10/10
Lamp: Amber

REASON: Turbocharger 1 Speed - Abnormal Rate of Change. The turbocharger speed sensor has detected an erroneous speed value.

EFFECT: None on performance. The ECM uses an estimated turbocharger speed.

Circuit Description:
The turbocharger speed sensor is a variable reluctance speed sensor. It consists of a coil of wire and an iron core. The target on the turbocharger shaft is a ground flat in the center of the shaft. As the flat on the turbocharger shaft passes the speed sensor, a signal is generated. The electronic control module (ECM) interprets this signal and converts it to a turbocharger speed reading.

Component Location:
The turbocharger speed sensor is located in the center housing of the turbocharger.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes:
The ECM detects that the turbocharger speed has increased faster than physically achievable by the turbocharger.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The ECM will estimate turbocharger speed.

Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM.

This fault becomes active if the engine is running and the turbocharger speed signal rapidly changes faster than the capabilities of the turbocharger. This fault code can be caused by an intermittent turbocharger speed sensor connection, incorrect turbocharger speed sensor air gap, or a faulty turbocharger speed sensor.

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