This Cummins 222 fault code document is a diagnostic procedure for the ambient air pressure sensor circuit on Cummins ISB CM550 engines. It identifies PID P108, SPN 108, and FMI 4, then gives connector, voltage, resistance, fault-code, and repair-verification checks for the circuit. The file is a 6-page PDF intended for service-tool guided troubleshooting.
Official Cummins 222 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550, 1990-94 |
| System/Group | DTCs; ambient air pressure sensor circuit |
| Year/Revision | Unknown |
| Pages | 6 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 222
- PID: P108
- SPN: 108
- FMI: 4
- AMBIENT AIR PRESSURE SENSOR CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Turn key switch ON and read the fault codes using the diagnostic tool.
- Step 2A) Inspect the ambient air pressure sensor and engine harness connector pins.
- Step 2B) Check the ECM ambient air pressure supply voltage.
- Step 2C) Check the ECM ambient air pressure signal voltage.
- Step 3A) Inspect the engine harness and the ECM connector pins.
- Step 3B) Check for an open circuit in the ambient air pressure signal wire.
- Step 3C) Check for a short circuit to ground.
- Step 3D) Check for a short circuit from pin to pin.
- Step 3E) Clear and check the fault codes.
- Step 4A) Check for the appropriate ECM response.
- Step 5A) Disable the fault code.
- Step 5B) Clear the inactive fault codes using the diagnostic tool.
Applicable truck models
This procedure applies to Cummins ISB CM550 engines listed in the file as 1990-94 coverage. The extract states that the ambient air pressure sensor is required with 300 horsepower rated engines and specific 275 horsepower rated engines, and that the sensor is located below the fuel transfer pump. It does not name truck makes, chassis models, or vehicle platforms, so application should be confirmed by engine control module, harness layout, and active fault-code data before parts replacement. For manufacturer information, visit Cummins official website.
Who needs this Cummins 222 fault code manual
Mechanics and workshop owners need this procedure when a service tool reports Fault Code 222 for the ambient air pressure sensor circuit. It supports testing of +5-VDC supply, signal voltage by altitude, connector condition, harness resistance, shorts to ground, shorts from pin to pin, ECM response, and final code clearing.
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
