This fault code 155 DTCs document is a two-page troubleshooting sheet for the intake manifold air temperature sensor engine protection circuit. It identifies PID P105, SPN 105, FMI 0, explains how the ECM uses intake air temperature, and lists checks for high engine compartment temperature, sensor location, air cleaner condition, and intake restriction.
Official fault code 155 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; intake manifold air temperature sensor circuit; engine protection circuit |
| Publication no. | Fault Code 155 |
| Year/Revision | Unknown |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 155
- PID: P105
- SPN: 105
- FMI: 0
- INTAKE MANIFOLD AIR TEMPERATURE SENSOR – ENGINE PROTECTION CIRCUIT
- Intake Manifold Air Temperature Sensor Circuit
- DESCRIPTION
- Possible causes
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Turn key switch ON and verify the sensor accuracy with a thermocouple or similar temperature probe
- Step 2A) Connect all the components and turn key switch ON
- Step 2B) Connect all components and turn key switch ON
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) engines within the DTCs group. The extract does not identify a specific truck chassis, so application should be confirmed by engine control module family and the active fault information: Fault Code 155, PID P105, SPN 105, FMI 0. The procedure covers the intake manifold temperature sensor located on the side of the intake manifold toward the rear of the cylinder head. It is written for diagnosing an intake manifold air temperature condition used by the ECM for engine protection, cold start aids, timing control, and fueling control. Reference brand information at the Cummins official website.
Who needs this fault code 155 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when a Cummins ISB CM550 reports a high intake manifold air temperature condition. The sheet supports sensor accuracy comparison with a thermocouple or similar temperature probe, checking the diagnostic tool monitor screen, disabling and clearing fault codes, and confirming whether Fault Code 155 is inactive after engine operation to typical operating temperature.
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