This Cummins coolant sensor document is a troubleshooting procedure for Fault Code 145 on the engine coolant temperature 1 sensor circuit. It covers PID P110, SPN 110, and FMI 3 or 4 conditions described as voltage below normal or shorted to low source. The procedure is written for diagnostic tool checks, connector inspection, resistance testing, harness testing, repair verification, and clearing inactive fault codes.
Official Cummins coolant sensor document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Engine Coolant Temperature 1 Sensor Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown |
| Pages | 6 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 145
- PID: P110
- SPN: 110
- FMI: 3 or 4
- ENGINE COOLANT TEMPERATURE 1 SENSOR CIRCUIT – VOLTAGE BELOW NORMAL OR SHORTED TO LOW SOURCE
- Coolant Temperature Sensor Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Read the fault codes using the diagnostic tool and check Fault Code 441
- Step 1B: Check Fault Codes 122, 123, 135, 141, 153, and 352
- Step 2A: Inspect the engine harness and coolant temperature sensor connector pins
- Step 2B: Check resistance from pin A to pin B of the coolant temperature sensor
- Step 2C: Check for a short circuit to ground from pin A to engine block ground
- Step 3A: Inspect the engine harness and ECM connector pins
- Step 3B: Check for an open circuit between ECM harness pins and sensor connector pins
- Step 3C: Check for a short circuit to ground from engine harness pins 23 and 19
- Step 3D: Check for a short circuit from pin to pin
- Step 4A: Disable the fault code, start the engine, and verify Fault Code 145 is inactive
- Step 4B: Clear inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 engines in the 1990-94 coverage group, specifically the diagnostic trouble code procedure for Fault Code 145. The extract identifies the coolant temperature sensor as located toward the front of the thermostat housing and states that the ECM uses coolant temperature for engine protection, timing, and fueling control. The resistance reference table shown in the document lists sensor resistance at 0°C, 25°C, 50°C, 75°C, and 100°C. For current manufacturer information, visit Cummins official website.
Who needs this Cummins coolant sensor manual
Mechanics and workshop owners need this Cummins coolant sensor manual when diagnosing an active or inactive Fault Code 145 with a diagnostic tool. It is useful when checking sensor resistance, connector damage, harness continuity, shorts to ground, shorts from pin to pin, ECM connector pins, and final repair confirmation.
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