This code 595 DTCs document is a troubleshooting procedure for a turbocharger 1 speed fault on CM2250 engines. It explains the turbocharger speed sensor circuit, the ECM response, fault clearing conditions, and guided electrical checks using INSITE™ electronic service tool and a multimeter.
Official code 595 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Turbocharger Speed Sensor Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 04-Jan-2011; overview section Last Modified: 11-Jun-2010 |
| Pages | 17 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check for barometric pressure or intake manifold pressure sensor faults.
- Guided Step 2 – Check for an intermittent fault condition.
- Guided Step 3 – Check for a damaged turbocharger speed sensor.
- Guided Step 4 – Check the engine harness.
- Guided Step 5 – Check the ECM.
- Guided Step 6 – Clear the fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine fault diagnostics where Fault Code: 595, PID: P103, SPN: 103, FMI: 0 is used for “Turbocharger 1 Speed – Data Valid But Above Normal Operating Range – Moderately Severe Level.” The extract identifies ISB6.7 CM2250 coverage and lists related associated procedures for ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 engines. See the manufacturer at Cummins official website.
Who needs this code 595 DTCs manual
Workshop technicians need this code 595 DTCs manual when diagnosing high turbocharger speed faults, amber CHECK ENGINE lamp complaints, or ECM-estimated turbocharger speed. It is also useful for shop owners who need the procedure sequence before assigning sensor, harness, or ECM work.
The diagnostic threshold shown is turbocharger speed greater than 150,000 rpm for more than 5 seconds. The procedure directs the technician to check for active Fault Codes 122, 123, 221, or 222 first, then reproduce the intermittent fault condition with keyswitch ON and engine operation. Later checks include connector inspection, turbocharger speed sensor resistance between 600 and 1600 ohms, short-to-ground testing above 100k ohms, circuit continuity, pin-to-pin short testing, ECM calibration review, and fault clearing through the stated high-idle validation routine. The document also references Procedure 019-031 for Electronic Control Module, 019-032 for ECM Calibration Code, 019-043 for Engine Wiring Harness, and 019-390 for Turbocharger Speed Sensor.
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