This Cummins coolant level document is a troubleshooting guide for Fault Code 235 on ISB CM550 engines. It identifies PID P111, SPN 111, and FMI 1 as an engine coolant level engine protection fault, with checks for the coolant level sensor, harness circuits, ECM pins, and fault clearing. The procedure warns that the sensor is complex and should not be tested with a multimeter.
Official Cummins coolant level document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; engine coolant level – engine protection |
| Publication no. | Not specified |
| Year/Revision | Unknown; document copywrite 2017 |
| Pages | 6 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 235
- PID: P111
- SPN: 111
- FMI: 1
- ENGINE COOLANT LEVEL – ENGINE PROTECTION
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Check coolant level
- Step 2A) Confirm the fault is still active with the engine running
- Step 3A) Check Fault Code 385 or 444 status
- Step 4A) Inspect the coolant level sensor, OEM pigtail harness, and engine harness connectors
- Step 4B) Check for an open circuit
- Step 4C) Check for short circuits to ground
- Step 4D) Check for short circuits from pin to pin
- Step 5A) Inspect the engine harness and ECM connectors
- Step 5B) Check for short circuits to ground at ECM pins
- Step 5C) Check for short circuits from pin to pin
- Step 5D) Check for open circuit in the coolant level sensor circuit
- Step 5E) Check sensor supply voltage
- Step 6A) Disable the fault code and verify Fault Code 235 is inactive
- Step 6B) Clear inactive fault codes
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) engine fault diagnostics for Fault Code 235. The extract notes that the coolant level sensor is an OEM supplied component, with location varying by truck, usually in the radiator top tank or surge tank. It also mentions Sterling Trucks using ECM pin A22 for coolant level sensing through a 2-pin sensor. For manufacturer information, visit Cummins official website.
Who needs this Cummins coolant level manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins coolant level manual when Fault Code 235 remains active after coolant has been added or when the engine derates for coolant level protection. The guide supports connector inspection, OEM pigtail harness resistance checks, ECM connector checks, sensor supply voltage testing, sensor replacement decisions, ECM replacement decisions, and final code clearing with a diagnostic tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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