This Cummins Fault Code 688 document is a troubleshooting manual for a high engine oil level fault on CM2150 engines. It explains the ECM logic, oil level sensor location, fault conditions, possible causes, and INSITE™ service tool steps for checking and clearing the code. The file is useful when a red STOP ENGINE light appears with PID P98, SPN 98, FMI 0.
Official Cummins Fault Code 688 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; ISB6.7 CM2150 2007-09 group coverage |
| System/Group | ISB6.7 CM2150 (2007-09) / DTCs; Engine Oil Level Sensor |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 5 |
| 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
- Fault Code 688: Engine Oil Level – Data Valid but Above Normal Operational Range – Most Severe Level
- 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 1A – Read the fault codes
- Guided Step 2 – Clear the fault codes
- Guided Step 2A – Disable the fault codes
- Guided Step 2B – Clear the inactive fault codes
Applicable truck models
This document applies to Cummins ISB, ISC, and ISL engines with CM2150 electronic controls, including the ISB 6.7L engine coverage referenced for CM2100 and CM2150 common rail fuel systems. The fault concerns the engine oil level sensor located on the engine oil dipstick, on the air intake side of the engine. It also references ISC and ISL CM2150 engines and the lubricating oil system procedure 007-037 in the related service manuals. For official engine support, see Cummins official website.
Who needs this Cummins Fault Code 688 manual
Workshop technicians, fleet mechanics, and diesel diagnostic specialists need this Fault Code 688 manual when the ECM detects oil level above the normal operating range at key-on. It supports diagnosis of overfilled oil, possible fuel leakage into the lube oil system, coolant contamination, calibration concerns, and fault clearing with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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