Cummins ISM code 122 is the DiagTechPro reference page for this Cummins diagnostic fault code 122 document, a 7-page PDF sourced from TruckFaultCodes.com (Copyright 2017) that covers the intake manifold pressure sensor circuit. The intake manifold pressure/temperature sensor monitors intake manifold pressure and passes information to the electronic control module (ECM) through the engine harness. If the intake manifold pressure becomes too high, it will cause a derate condition. When the condition is detected the ECM logs the fault and turns on the yellow warning lamp to alert the driver and technician.
Cummins ISM code 122 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISM CM570 (1999-02) / DTCs; ISX CM570 (1999-02) / DTCs; Signature CM570 (1999-02) / DTCs |
| System / Group | ISM CM570 (1999-02) / DTCs |
| Fault identifier | Code 122 (PID P102, SPN 102, FMI 3) |
| Warning lamp | Yellow |
| Source | TruckFaultCodes.com |
| Year / Revision | Copyright 2017 |
| Pages | 7 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Repair verification and clearing fault codes
Applicable truck models
This document applies to Cummins ISM CM570 (1999-02) / DTCs; ISX CM570 (1999-02) / DTCs; Signature CM570 (1999-02) / DTCs electronic engines used in on-highway and vocational trucks. The intake manifold pressure/temperature sensor is located in the air intake manifold toward the front of the engine. The troubleshooting section walks through connector and pin inspection, engine-harness resistance measurements and pin-to-pin continuity checks, and ends with a road test that confirms the code is inactive and all fault codes are cleared. Because the same procedure isolates the sensor, the harness and the ECM in turn, it prevents replacing parts that are still good. Verify engine calibration and coverage against the official Cummins engine support site before ordering parts.
Who needs this Cummins ISM code 122 manual
Any mechanic or workshop owner diagnosing ISM code 122 needs this PDF to follow the factory circuit and resistance checks in the correct order. Determine if engine is being overfueled. Confirm that the correct intake manifold pressure/temperature sensor part number is being used. Confirm that the correct turbocharger is being used.
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