This 2 pages document covers Fault Code 488 for the intake manifold air temperature sensor engine protection circuit. It identifies PID P105, SPN 105, and FMI 0, then gives basic diagnostic checks for high intake manifold air temperature. The file is a short PDF intended for service reference during electronic engine troubleshooting.
Official 2 pages document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; intake manifold air temperature sensor circuit; engine protection circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Unknown; source page shows Copywrite 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 488
- PID: P105
- SPN: 105
- FMI: 0
- INTAKE MANIFOLD AIR TEMPERATURE SENSOR – ENGINE PROTECTION CIRCUIT
- Intake Manifold Air Temperature Sensor Circuit
- DESCRIPTION
- 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. Turn key switch ON and disable the fault code.
- Step 2B) Connect all components and turn key switch ON. Clear the inactive fault codes using the diagnostic tool.
Applicable truck models
This document applies to Cummins ISB CM550 engines listed under the 1990-94 DTC group. The extract does not name a truck make or chassis model, so use it by engine and control system coverage rather than by vehicle badge. For manufacturer information, visit the Cummins official website.
Who needs this 2 pages manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this reference when Fault Code 488 is active or stored on a Cummins ISB CM550 engine. It supports checks around the intake manifold air temperature sensor reading, thermocouple comparison, air cleaner condition, fan clutch condition, intake restriction, and code clearing.
The procedure explains that the intake manifold air temperature sensor is used by the ECM to monitor engine intake air temperature for engine protection, timing, and fueling control. It also warns that this is a warning fault code and that continued temperature rise can lead to Fault Code 155 and engine shutdown. The component location is described as the side of the intake manifold, toward the rear of the cylinder head, near cylinder No. 6. The troubleshooting flow uses a diagnostic tool connected to the datalink, compares sensor temperature to an external probe when available, directs incorrect readings to Fault Code 154, and confirms repair by operating the engine to typical operating temperature before clearing inactive fault codes.
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