The Cummins ISM code 433 manual is a 6-page diagnostic PDF for the intake manifold pressure circuit on the ISM CM570 (1999–2002) engine. It describes the intake manifold pressure/temperature sensor that passes boost data to the electronic control module (ECM) through the sensor harness.
Cummins ISM code 433 document details
| Brand | Cummins |
| Model coverage | ISM CM570 (1999–2002) |
| System / group | Intake manifold pressure circuit — DTCs |
| DTC number | 433 |
| PID / SPN | P102 / 102 |
| FMI | 2/2 |
| Warning lamp | YELLOW |
| Pages | 6 |
| File format | |
| Language | English |
Document table of contents
- Circuit description and component location
- Shop talk and 50-rpm check window
- Tamper and harness inspection
- Connector pin and resistance tests
Applicable truck models
This procedure applies to the ISM CM570 (1999–2002) engine and the shared CM570 fuel-system platform found in on-highway trucks. The same fault-code logic is carried across related CM570 engine families of that era. For engine identification and factory service references, see the manufacturer at the Cummins official website.
Who needs this Cummins ISM code 433 manual
The document places the sensor on the cylinder head between the air horn and the front of the engine, and explains that pressure above 127 mm Hg [5 in Hg] for more than 20 seconds under 5-percent load triggers a derate. The ECM checks this only at engine speeds up to 50 rpm above set idle. The tree begins by inspecting the sensor and harness for tampering or added wires, then examines the connector pins before moving to resistance and voltage measurements.
This guide suits diesel technicians and workshop owners who face an over-boost signal that causes a derate and want to confirm sensor wiring and tampering before parts replacement. It reads as fault code 433 troubleshooting steps for the intake manifold pressure circuit, keeping the diagnosis ordered and evidence-based.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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