ISM code 212 DTCs identifies a engine Oil Temperature Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source on the Cummins ISM CM871 (2007-09) engine, and this five-page PDF documents SPN 175 / FMI 3/3 (PID P175) in full. It sets out the fault description, component location, shop-talk notes, and a step-by-step troubleshooting tree so a technician can confirm and clear the code with a diagnostic tool.
ISM code 212 DTCs document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) and ISX CM871 (2007-09) |
| System / Group | DTCs / Engine Oil Temperature Sensor 1 Circuit |
| PID / SPN / FMI | P175 / SPN 175 / FMI 3/3 |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 6 |
| File size | 0.2 MB |
| Format / Language | PDF / English |
Fault description and meaning
The engine oil temperature sensor is a variable-resistor sensor used to measure the temperature of the engine oil in the oil rifle. The ECM supplies 5 volts to the signal circuit and monitors the change in voltage caused by the change in sensor resistance to determine oil temperature. This document is filed under fault code 212, engine Oil Temperature Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. The condition raises a amber warning lamp on the dash. Because the sensor shares supply and return wires in the engine harness with other sensors, the manual advises checking for multiple active faults before starting the 212 procedure.
Document table of contents
- Fault code information: PID P175, SPN 175, FMI 3/3, lamp amber
- Description
- Component location
- Shop Talk
- Troubleshooting steps (harness, connector, and ECM checks)
- Circuit-repair verification and code clearing
Applicable truck models
This procedure applies to Cummins ISM CM871 (2007-09) engines. The identical fault code and engine oil temperature sensor 1 circuit also appear in the parallel Cummins ISX CM871 (2007-09) listing. The troubleshooting steps inspect the engine oil temperature sensor 1 circuit connector pins, verify the 4.75 to 5.25 VDC supply across the sensor, and confirm the fault goes inactive with a diagnostic tool after any repair. Cummins publishes the authoritative service data for these engines on its official website.
Who needs this ISM code 212 DTCs manual
Fleet technicians and workshop owners diagnosing engine oil temperature sensor 1 circuit complaints on 2007-09 emissions-era Cummins engines need this sheet to work the fault methodically. It pairs with the wider Cummins ISM CM871 DTC set for full engine-harness coverage.
Related manuals library
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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