This Cummins fault code 122 document is a six-page troubleshooting file for the intake manifold pressure sensor circuit. It identifies PID P102, SPN 102, FMI 3, and explains how the ECM receives intake manifold pressure information through the sensor harness. The procedure focuses on fault verification, turbocharger checks, sensor voltage tests, connector inspection, harness resistance checks, and final code clearing.
Official Cummins fault code 122 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; intake manifold pressure sensor circuit |
| Publication no. | Not stated; references Troubleshooting and Repair Manual, ISC Engines, Bulletin Number 3666245 |
| Year/Revision | Unknown; document copywrite 2017 |
| Pages | 6 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 122
- PID: P102
- SPN: 102
- FMI: 3
- INTAKE MANIFOLD PRESSURE SENSOR CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Turn the key switch ON and read the fault codes using the diagnostic tool
- Step 2A: Check turbocharger operation and positive intake manifold pressure using a mechanical gauge
- Step 3A through 3D: Inspect for tampering, connector damage, supply voltage, and signal voltage
- Step 4A through 4D: Inspect ECM and harness connectors, then check open circuits, shorts to ground, and pin-to-pin shorts
- Step 5A through 5B: Disable, verify, and clear fault codes
Applicable truck models
This file applies to Cummins ISB CM550 engines listed under the 1990-94 DTC group. The extract also references the intake air manifold, fuel filter area, turbocharger, waste gate, ECM, engine harness, and intake manifold pressure sensor, so it is intended for vehicles using this Cummins electronic engine control arrangement. For manufacturer information, visit Cummins official website.
Who needs this Cummins fault code 122 manual
Workshop owners, diesel mechanics, and diagnostic technicians need this manual when Fault Code 122 is active or when the intake manifold pressure sensor circuit must be checked before replacing parts. It is also useful when confirming correct sensor part use, correct turbocharger use, possible overfueling, intake restriction, cold intake air effects, connector condition, and engine harness integrity.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
