This code 195 DTCs document is a troubleshooting manual for the Coolant Level Sensor 1 Circuit on CM2250 engines. It explains the voltage-above-normal or shorted-to-high-source condition, diagnostic logic, INSITE™ checks, harness tests, sensor checks, ECM calibration review, and final fault clearing steps.
Official code 195 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Coolant Level Sensor 1 – 3 Wire Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250; other listed bulletins include 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 29-Jul-2010 and 30-Dec-2010 |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 195 – Coolant Level Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source
- 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 the fault codes
- Guided Step 2 – Check the engine coolant level sensor and circuit
- Guided Step 3 – Check the ECM and OEM harness
- Guided Step 4 – Check ECM calibration and clear fault codes
Applicable truck models
This file applies to Cummins CM2250 engine platforms listed in the procedure table: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The sensor location is described as typically in the radiator top tank or surge tank, with final location details referred to the OEM service manual. For manufacturer information, visit Cummins official website.
Who needs this code 195 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when an amber CHECK ENGINE lamp or MIL is linked to high signal voltage at the engine coolant level circuit. It is useful when checking for an open return circuit, a signal circuit shorted to sensor supply or battery voltage, or a sensor supply circuit shorted to battery voltage.
The troubleshooting flow uses INSITE™ electronic service tool to read active and inactive codes, checks for Fault Code 1695, verifies whether Fault Code 196 becomes active during jumper testing, and confirms the 4.75-VDC to 5.25-VDC sensor supply range. Later steps inspect the ECM and OEM harness connector pins for loose connectors, corrosion, bent or broken pins, pushed back or expanded pins, moisture, missing seals, dirt, debris, shell damage, and wire insulation issues. Resistance tests include an open RETURN circuit check with a less than 10 ohms specification and pin-to-pin short circuit checks with a greater than 100k ohms specification. If repairs do not clear the issue, the manual directs the user to check ECM calibration revision level and use the clearing conditions from the summary section.
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