27.1 SPN 103/FMI 0 This diagnosis is typically turbocharger speed below threshold (Low Box). 27.1.1 Low Speed Check (Low Box) Check as follows: 1. Inspect…

This diagnosis is typically oil pressure very low. Perform the following steps to troubleshoot an oil pressure very low fault 26.4.1 Multiple Codes Check Check…

This diagnosis is typically an Engine Oil Pressure Sensor circuit failed low. 26.3.1 Failed Low Circuit Check Check as follows: 1. Turn the ignition ON…

A typical diagnosis is an Engine Oil Pressure Sensor circuit failed high. 26.2.1 Failed High Circuit Check Check as follows: 1. Turn the ignition ON…

SPN 100/FMI is typically low engine oil pressure. 26.1.1 Low Oil Pressure Check Check as follows: 1. Check for multiple codes. [a] If fault codes…

The typical diagnosis for this fault is circuit failed low. 24.3.1 Low Voltage Check Perform the following steps to troubleshoot low voltage. 1. Disconnect the…

The typical diagnosis for this fault is circuit failed high. 24.2.1 High Voltage Check Check as follows: 1. Disconnect the Accelerator Pedal (AP). 2. Turn…

A typical diagnosis for the fault is erratic data. 24.1.1 Erratic Data Check Check as follows: 1. Disconnect the Accelerator Pedal (AP). 2. Turn ON…

23.1 SPN 84/FMI 2 Contact the Detroit Diesel Support Center at 313–592–5800. 23.2 SPN 84/FMI 3 This diagnostic condition is typically VSS open circuit. 23.2.1…

22.1 SPN 84/FMI 13 This fault is typically the J1939 wheel-based vehicle speed signal from Source #1 is missing. 22.1.1 Missing Signal from Source #1,…