ISM code 155 DTCs identifies a intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level on the Cummins ISM CM871 (2007-09) engine, and this five-page PDF documents SPN 105 / FMI 0/0 (PID P105) 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 155 DTCs document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) and ISX CM871 (2007-09) |
| System / Group | DTCs / Intake Manifold 1 Temperature Sensor Circuit |
| PID / SPN / FMI | P105 / SPN 105 / FMI 0/0 |
| Warning lamp | Red |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format / Language | PDF / English |
Fault description and meaning
The intake manifold temperature sensor is a variable-resistor sensor used to measure the temperature of the air entering the intake manifold. The ECM supplies 5 volts to the signal circuit and monitors the change in voltage caused by the change in sensor resistance. This document is filed under fault code 155, intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level. The condition raises a red 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 155 procedure.
Document table of contents
- Fault code information: PID P105, SPN 105, FMI 0/0, lamp red
- 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 intake manifold 1 temperature sensor circuit also appear in the parallel Cummins ISX CM871 (2007-09) listing. The troubleshooting steps inspect the intake manifold 1 temperature sensor 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 155 DTCs manual
Fleet technicians and workshop owners diagnosing intake manifold 1 temperature sensor 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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